Prime Your Pump: Fix Shallow Well Jet, Submersible, and Standard Well Pumps

Your pump is humming but no water is flowing? You’ve lost prime, and that’s a DIY fix.

We will cover priming steps for shallow well jet pumps, submersible pumps, and standard well pumps, along with how to troubleshoot and fix persistent priming problems.

I’ve fixed this issue on hundreds of service calls. Always kill the power at the breaker before you touch anything.

What is Pump Priming and Why Does Your Pump Need It?

Think of priming your water pump like priming a medical syringe. Before you can inject anything, you pull back to fill the syringe with fluid, pushing the air out. A pump works the same way. Its internal impeller needs to be completely surrounded by water to create the pressure that moves water through your pipes.

Your pump needs water, not air, to create the suction that pulls water from your well or tank. If the pump casing is full of air, the impeller just spins uselessly. It can’t grab onto anything to start the flow.

Losing prime means your pump is sucking air instead of water. You’ll hear it running, but no water comes out. It might sound like it’s struggling or cycling on and off quickly.

Can a well pump lose its prime? Absolutely, and it’s one of the most common service calls for above-ground jet pumps and standard centrifugal pumps. It’s their main weakness.

The Three Main Pump Types: Which One is in Your Basement or Well?

Before you try to fix anything, you need to know which pump you’re dealing with. The method for priming it depends entirely on the type.

Shallow Well Jet Pump

This is the classic above-ground pump you’ll see in a basement or utility room next to a pressure tank. It has a single pipe running down to the well. It’s designed for wells where the water level is no more than 25 feet below the pump. If your well is deeper than that, this pump can’t pull the water up. It relies entirely on a good prime to work and loses it easily if there’s a tiny air leak.

Standard Centrifugal or Convertible Jet Pump

These look similar to a shallow well pump but are more heavy-duty. They often have two pipes (1 1/4″ and 3/4″) going down the well. They can be configured as a shallow well pump or, with a jet assembly installed in the well, can pull from much deeper depths. You’ll also find these as booster pumps for pools or irrigation. They also require manual priming and are prone to losing it if the system isn’t airtight.

Submersible Pump

This pump is installed deep in your well, completely underwater. You’ll only see the electrical conduit and water pipe coming out of the well casing to your house. The pump itself is a long, sealed cylinder.

So, can a submersible pump lose prime if it’s under water? The pump itself is always submerged, so it doesn’t need priming in the traditional sense. The “prime” issue for a submersible isn’t in the pump, it’s in the suction line-the pipe between the well and your pressure tank. If that pipe gets an air leak, you’ll have the same symptoms: air in your faucets, sputtering water, and a pump that short-cycles.

You might see pumps advertised as “self-priming.” This usually means they have a special design to trap a reservoir of water inside to help restart. Don’t rely on it. In my experience, if a standard pump runs dry for more than a minute, you’re priming it manually, no matter what the box says.

Your Pump Priming Toolbox: A No-Nonsense Checklist

Before you touch a single pipe, gather everything you need right here. I keep a dedicated five-gallon bucket with most of this gear on a shelf in my garage. Running back and forth to the hardware store mid-job is a classic rookie move.

The Tools You Must Have

This isn’t a wish list. These are the essentials to get the job done right.

• Adjustable Wrenches (Two): You need two-one to hold the fitting, one to turn the nut. A single wrench will just twist your pipes and create a new leak.
• Screwdrivers (Flathead and Phillips): For removing cover plates on the pump motor and electrical connections (with power OFF).
• A Clean Five-Gallon Bucket: For holding water to prime the pump and catching spills. Don’t use the one from your car wash kit.
• A Standard Garden Hose: It must reach from your nearest faucet to the pump. This is your main water supply for forcing prime back into the system.
• Teflon Tape and Pipe Thread Sealant: Use tape on male pipe threads. Use a brush-on liquid sealant for any plastic or larger fittings. Double-sealing is cheap insurance against air leaks that kill your prime.
• A Helper (Optional but Recommended): One person can pour water while the other watches for leaks and operates valves. It’s much easier.

Common Replacement Parts to Check

More often than not, a pump that won’t hold prime has a failed part. Inspect these first. Having them on hand saves a second trip.

• Foot Valve or Check Valve: This is the #1 culprit. The foot valve is at the bottom of the well pipe on jet pump systems. A check valve is usually near the pump tank. If it’s stuck open or full of debris, it lets water drain back into the well, losing prime instantly.
• Pipe Seals and Gaskets (O-rings, union gaskets): Any connection you open might need a new seal. Old rubber gets hard and cracked, letting in air.
• Priming Plug or Bleeder Valve: This is the small plug on top of the pump volute. You remove it to add water. If the threads are stripped or it’s leaking air, replace it.

Critical Components: The Priming Tee and Valve

You asked about the ‘well pump priming tee’ and ‘well pump priming valve’. These aren’t on every pump, but you need to know them.

A priming tee is a special fitting plumbed into the suction line of a jet pump. It has a port just for adding water. If your system has one, it’s the best place to connect your garden hose.

A priming valve (or bleeder valve) is a small petcock or screw valve used to release trapped air from the pump chamber. You open it until a solid stream of water comes out. If this valve is corroded open or won’t seal, it will suck air and prevent priming. Check it for drips or hissing sounds when the pump is off.

A Pro’s Final Advice

If you have a shallow well jet pump system, buy a spare foot valve. Keep it in your toolbox. I’m not kidding. In my experience, they fail way more often than the pump itself. The flapper or spring inside wears out, or a piece of sand holds it open. Having a $25 part ready can save you a weekend without water when your shallow well jet pump stops working.

How to Prime a Shallow Well Jet Pump: A Step-by-Step Guide

Safety First: Power Down and Depressurize

Never work on a pressurized pump. Your first move is to make the system safe.

Go to your home’s main electrical panel and find the breaker for the well pump. Switch it to the OFF position. This is non-negotiable; you are dealing with water and electricity. This step is part of safely shutting down the well pump electrical system. Verify the circuit is fully de-energized before any maintenance.

Next, open the cold water faucet closest to the pressure tank. Let it run until the water flow stops and the hissing of air from the lines quiets down. This relieves all pressure from the system so you can open fittings safely.

Locate and Open the Priming Port

Look at the top of the pump housing. You’ll find a threaded plug, usually brass or plastic, about the size of a quarter. This is your priming port, sometimes called a bleeder port.

Think of it like the bleeder valve on a car radiator. Its job is to let trapped air out so water can fill the pump cavity. Use a wrench that fits the plug snugly to avoid stripping it. Turn it counterclockwise to loosen and remove it completely. Have a small bucket or rag ready in case a little water dribbles out.

Fill the Pump Until Water Overflows

Get a jug of clean water. A garden hose connected to another source works better if you have one nearby.

Start pouring water slowly into the open port. You will hear it gurgling down into the pump and the suction pipe. Keep pouring steadily until water fills the port and begins to overflow. This means the pump’s volute is full.

Be patient. If the suction line back to the well is empty, it can take several gallons. On my own system last summer, it took nearly five gallons to fill everything up after I replaced a foot valve. Let the overflow run for a few seconds to push out any big air pockets.

Seal It Up, Power On, and Test

Quickly but carefully thread the priming plug back into its port. Hand-tighten it first, then give it about a quarter to a half turn with the wrench. You want it snug and watertight, but don’t over-tighten and crack the housing.

Go back to the electrical panel and flip the pump breaker back ON. Listen to the pump. You should hear it start immediately and begin to hum as it builds pressure.

Watch the pressure gauge on your tank tee. A primed, working pump will show a steady climb in pressure, typically from 0 psi up to its cut-off point (like 40 or 60 psi). Once the gauge stops climbing and the pump shuts off, go to a faucet and turn it on. You should get smooth, steady, air-free water flow. If you get sputtering or no water, the prime was lost and you need to repeat the steps, checking for leaks.

Priming a Submersible Pump: The Truth About “Losing Prime” Underground

If your submersible pump is installed correctly, you should never have to prime it by hand. The pump sits deep in the water, so it’s always submerged and ready to push water up the pipe when it turns on. Needing to add water to the system is a sign something has gone wrong underground, and you might need to troubleshoot the submersible pump.

When a homeowner tells me their deep well submersible pump lost its prime, I know they’re usually describing a symptom, not the real problem. The issue is almost never the pump itself but a failure in the plumbing that lets air into the system. This mimics the “loss of prime” you get with a jet pump above ground.

What “Losing Prime” Really Means for a Submersible Pump

For a submersible system, three common failures create the sputtering faucets and air in the lines that feel like a lost prime.

• Air Leak in the Drop Pipe: The long pipe from the pump to your house can develop a crack or a loose joint. This lets air suck in every time the pump runs, slowly draining water back down the well.
• Failed Check Valve: A small one-way valve sits above the pump. It stops water from flowing back down the well when the pump shuts off. If it sticks open or breaks, water drains out, and the pump has to push air first.
• Drained or Waterlogged Pressure Tank: Your pressure tank needs a cushion of air to work. If the tank is full of water (waterlogged), the pump cycles on and off too fast, causing surging pressure that can pull air in from tiny leaks.

So, can a submersible well pump lose its prime? Technically, no. But a leaky drop pipe or bad check valve creates the exact same problem: your pump is pushing air instead of water.

How to Find the Real Problem: A Step by Step Check

Start with the easiest fix and work your way to the harder ones. You’ll need a tire pressure gauge and a good ear.

1. Check the Pressure Tank’s Air Charge

Shut off the pump’s power at the breaker. Open a faucet to drain all water pressure. Find the air valve on your pressure tank (it looks like a bike tire valve). Use your tire gauge to check the air pressure.

• For a standard 30/50 psi pressure switch, the tank’s air charge should be 28 psi.
• If the reading is at 0 psi or it spits water, your tank is waterlogged and likely needs replacement.

A waterlogged tank makes every other small leak in your system much worse and can cause rapid pump cycling.

2. Listen for Air in the Pipes

Turn the pump’s power back on. Go to a faucet closest to your pressure tank and turn it on. Listen carefully.

• If you hear sputtering, gurgling, or a hiss when water starts to flow, air is definitely in the lines.
• This confirms the problem is between the pump and the tank, not in your house plumbing.

3. Inspect Above Ground Fittings and the Well Seal

Visually check every pipe joint, valve, and fitting you can see above ground, especially where the pipe comes out of the well casing. Look for moisture, corrosion, or mineral deposits (a white, crusty buildup). A single dripping fitting above ground is a sure sign of an air leak under suction. Tighten any loose connections, but if the leak is at the well seal or underground, you’ll likely need a pro.

If all above ground checks pass, the leak is in the drop pipe or the check valve down the well. Fixing a deep well submersible pump’s “prime” problem usually means pulling the pump to replace the pipe or the check valve. That’s a job for a well technician with the right hoisting equipment.

Fixing Priming Problems: When Water Just Won’t Stay Put

The Pump Won’t Hold Prime: Tracking Down the Leak

If your pump loses prime as soon as you stop pouring water, you have an air leak. Air is getting in somewhere on the suction side, between the pump and the water source.

Start with the easy checks. Shut off the power to the pump. Then, inspect every single pipe joint and connection on the suction line you can see. Look for dampness, corrosion, or cracked fittings. Tighten any loose unions or hose clamps with a wrench. Don’t forget the strainer basket lid or priming plug gasket on the pump itself; a worn one here is a common culprit.

If you can not prime the well pump and the water just goes down the pipe, you have a classic foot valve failure. A foot valve is a one-way check valve at the bottom of the suction pipe in the well. Its job is to hold the prime in the pipe. If it’s stuck open, broken, or missing, the water will simply drain back into the well. For a submersible pump, the check valve is usually built into the pump discharge or located in the pitless adapter; the same failure applies.

To diagnose a bad foot valve on a jet pump, you can sometimes listen. After trying to prime, put your ear to the suction pipe going into the ground. If you hear a faint gurgling or rushing sound, that’s water falling back down the well, confirming the valve isn’t sealing. Fixing it means pulling the entire suction pipe from the well.

Worn Pump Internals: Impeller and Seal Failure

Sometimes the pump itself is the problem. Inside, a component called the impeller spins to create suction. Over years, sand, grit, or just normal wear can erode the impeller vanes or the volute (the housing it spins in).

When the clearances inside the pump get too wide, it can’t create strong enough suction to pull water up from the well, even with a good prime. Think of it like a worn-out fan that just buzzes instead of moving air.

The signs are often gradual. You might notice weaker water pressure, or the pump runs longer to fill the pressure tank. Eventually, it may just hum loudly without moving any water, even after a perfect prime. On some pumps, you can remove the housing to inspect the impeller for scoring or chipping. A worn mechanical shaft seal can also let air into the pump housing, mimicking an external leak.

Frozen Pipes and Other Seasonal Headaches

Yes, a well pump can absolutely need priming after slight freezing. A frozen section in your suction line or a crack from ice expansion will stop flow and introduce air.

Even a partial freeze can create a tiny ice blockage or crack a fitting, breaking the prime and letting air into the line. If your pump was working and then suddenly isn’t after a cold snap, freezing is a prime suspect. Protecting your well pump from freeze damage is essential to keep it reliable through winter. Simple precautions, like insulating exposed pipes and keeping the pump area warm, can help prevent freezes.

First, safely thaw any exposed pipes with a hairdryer or heat tape, starting near the pump. Never use an open flame. Once thawed, you must re-prime the pump. More importantly, inspect the thawed section and all fittings closely for cracks or splits. A small hairline crack can suck air without leaking much water. Insulate exposed pipes and consider a simple heat source in the pump house to prevent a repeat.

Installing or Replacing a Priming Bleeder Port

Some older or basic pump models lack a dedicated priming port, making priming a messy chore. You can install one. This is an advanced modification that requires drilling and tapping the pump housing.

First, identify a flat, thick area on the top of the pump volute, near the discharge outlet. You’ll need a pipe tap and drill bit set (usually for a 1/4″ or 3/8″ pipe thread), a drill, a standard pipe plug, and a brass bleeder valve. Shut off all power and drain the pump completely.

Drill a pilot hole, then use the correct tap to cut threads into the cast iron or bronze housing. Go slow and use cutting oil. Screw in the bleeder valve with pipe sealant. This job is much easier on older cast iron pumps; modern thin-shell pumps can be difficult or risky to tap without causing damage. If your pump already has a plugged port, simply replacing the plug with a bleeder valve is a straightforward swap.

Red Flag Alerts: Signs Your Pump Issue is Bigger Than Priming

Priming is the first step, not the only step. Sometimes the problem is more serious. Here’s how to spot the red flags.

1. The pump runs but delivers no water pressure, even after repeated priming.

You’ve filled the pump housing and discharge pipe three times. The motor hums, but no water builds pressure. This is a major clue. This symptom almost always means you have a major air leak on the suction side or the pump itself has failed. The prime water is escaping faster than the pump can pull a vacuum.

Your first move is to check every fitting and valve between the pump and the well. Look for frost cracks on pipes, loose hose clamps on a jet pump, or a damaged foot valve at the bottom of the well pipe. A simple trick is to pour water over the suspect joints while the pump runs; if it gets sucked in, you found your leak.

If all the plumbing looks good, the pump is likely shot. An impeller can wear out or the volute casing can crack. For a shallow well jet pump, this might be a DIY replacement. For a deep well or submersible, it’s time for a pro. If there’s still no water flow after these checks, you may be facing No Water Flow Well Pump Issues and should review the next steps.

2. You hear loud grinding, screeching, or knocking from the pump motor.

Your pump should sound like a steady hum. Any other sound is bad news. Grinding means metal is touching metal inside. Screeching points to dry, seized bearings. Knocking can mean a broken impeller blade bouncing around.

Turn the pump off immediately and do not restart it. Running it in this state turns a repairable problem into a pile of scrap metal. For a jet pump, you might get away with replacing the motor or the pump end. For a submersible pump, a noise like this usually means pulling the entire unit from the well. That’s a big job.

I had a jet pump on my old shop start screeching. I caught it early, shut it down, and found the bearing seal had failed. A new motor from the supply house fixed it. If I’d let it run, it would have melted the windings.

3. The pump cycles on and off every few seconds (rapid cycling).

This is a classic sign of a waterlogged pressure tank. The tank’s internal rubber bladder is ruptured. Instead of holding a cushion of compressed air, the tank is full of water. The pump turns on, hits the pressure switch cutoff instantly, turns off, and the pressure drops just as fast.

Test this by tapping the tank with a wrench. A properly charged tank will sound hollow on the top half and solid on the bottom. A waterlogged tank sounds solid all the way up. You can also check the bladder in the pressure tank by pushing the Schrader valve (like a tire valve) on the tank; if water comes out, the bladder is gone.

A new pressure tank is the only fix for a ruptured bladder. Continuing to run the pump with this issue will burn out the motor quickly.

4. There is visible damage to the pump casing, wiring, or a major leak at the wellhead.

Look with your eyes. A cracked pump housing, frayed and sparking wires, or water gushing from the well seal are not priming issues. They are physical failures that require repair.

Electrical damage is a fire and shock hazard. Major casing leaks mean the pump can’t build pressure. A leaking wellhead can allow surface contaminants into your well. For any of these, turn off the power at the breaker, shut any isolation valves, and call a professional. This is beyond a simple DIY fix and involves serious safety and code considerations, especially when it comes to disease-related pressure loss.

5. You have sand or sediment consistently in your water.

A little grit after working on the system is normal. Grit in every glass of water is a problem. For a submersible pump, this often means the pump is sitting at the bottom of the well, sucking in sand because the well screen is failing or the water table has dropped. The sand acts like sandpaper on the impellers.

For a jet pump, sediment can wear out the jet assembly and erode the volute. Consistent sediment usually signals a failing well structure or a pump that is wearing itself out from the inside. You can install a spin-down filter or sediment filter as a band-aid, but the root cause needs a well professional to diagnose. They may need to pull the pump, check the well depth, and possibly rehabilitate or redrill the well.

The DIY vs. Pro Verdict: What You Can Fix and When to Make the Call

Let’s cut to the chase. This job gets a difficulty rating of 5 out of 10. The reason is simple. Pouring water into a pump to prime it is easy. Diagnosing and sealing the leak that caused it to lose prime is where the complexity starts.

What a Homeowner Can (and Should) Handle

You are perfectly equipped to handle the basic recovery steps. If your water suddenly stops, try these tasks first.

• Priming a jet pump. This is the classic fix. You shut off power, find the priming port, and add water until it flows from the outlet. It’s messy but straightforward.
• Replacing an above-ground check valve. If your pump loses prime overnight, a bad check valve is the usual suspect. If it’s located on the discharge pipe in your basement or pump house, you can swap it with two pipe wrenches and some sealant.
• Tightening easy-to-reach fittings. A visual inspection can reveal a leak. If you see a drip at a union or a pipe thread right at the pump, tightening it might solve everything. Do this with the pump off and pressure released to avoid a dangerous spray of water.

When You Absolutely Need to Call a Professional

Some problems require specialized tools, deep knowledge, and a willingness to accept significant liability. Do not attempt these.

• Pulling a submersible pump. This needs a pump hoist, well caps, and knowledge of wiring and drop pipe. One mistake can drop your pump 200 feet down the well.
• Repairing deep underground pipe. A leak in the buried pipe between the well and the house means excavation. This is a job for a pro with a backhoe and locator tools.
• Replacing a pump motor or any major electrical work. Working on the motor itself or the high-voltage wiring to the pressure switch requires a licensed electrician or pump technician. It’s a safety and code issue.

The Truth About “Self-Priming” Pumps

You might search for a “self priming well pump for sale” hoping to avoid this hassle. Here’s the reality check. That label means the pump can re-prime itself from a dry start if the system is already sealed and airtight. It doesn’t mean maintenance-free. A small leak in a foot valve or pipe will still defeat it. Weigh the cost of a new pump against the price of repairing the leak in your current system. Often, fixing the leak is the smarter, cheaper move.

The Final Word

Follow the basic priming and inspection steps. If you get water flowing, great. If the pump holds prime for a day and then loses it again, you likely have a leak you can’t easily see. If you’ve checked all the easy fittings and the check valve, and water still won’t flow or stay, your investigation is over. That’s your signal to stop and call a well specialist. They have the gear and experience to find the leak underground or in the well itself without causing more damage.

Common Questions

Is a “self-priming” pump really maintenance-free?

No, that’s a common misconception. A self-priming pump can restart if it loses its internal water reserve, but it still requires a completely airtight suction system. If you have a leaky foot valve or pipe, even a self-priming pump will fail. Always fix the air leak first.

Do I need to install a priming tee on my jet pump?

Not necessarily, but it’s a smart upgrade if you prime often. A permanent priming tee provides a clean, threaded port to connect a garden hose, making the process much less messy than pouring water into a small plug hole. It’s a convenient timesaver for routine maintenance.

Can I replace a leaking bleeder valve or priming plug myself?

Absolutely, this is a common DIY fix. First, shut off the power and depressurize the system. Simply unscrew the old, corroded plug or valve and replace it with a new one of the same size, using pipe sealant on the threads. This small part is often the source of an air leak.

My pump has a priming valve. Do I open or close it to prime?

You open it to prime and bleed air, then close it to run. Open the valve while adding water to the pump; it lets air escape. Once a solid stream of water comes out with no air bubbles, close the valve tightly. Run the pump and check for drips—a leak here will break your prime.

Is buying a new self-priming pump better than fixing my old one?

Often, no. The problem is usually a failed foot valve or an air leak, not the pump itself. Weigh the cost of a new pump (several hundred dollars) against the price of a $25 foot valve or some pipe sealant. Fixing the leak is almost always the more economical and effective solution.

Keeping Your Pump Primed and Running Smoothly

Always begin by filling the pump casing completely with water and inspecting every suction line connection for air leaks. Getting this right stops most priming issues before they start and protects your pump from needless wear.

Sources and Additional Information

• Revive Your Water Well Pump: Easy Steps to Get It Flowing Again
• r/Plumbing on Reddit: How to prime shallow well jet pump after running dry? Info in comments.
• How to Prime a Well Pump – Priming Your Well Pump
• How to Prime your Pump: A Step-by-Step Guide – Flint & Walling