Symptoms Of 7.3 Powerstroke weak fuel pump: Detect and Fixing process

If you own a 7.3 Powerstroke truck, one component that you need to pay close attention to is the fuel pump. A faulty fuel pump can cause your truck not to start or stall when driving. There is a variety of things that can cause 7.3 Powerstroke fuel pump problems.

But whatever the cause is, diagnosing a 7.3 Powerstroke weak fuel pump is important. Like with any other engine malfunction, there are several signs to look out for. These signs will help you know when it is time to get the 7.3 Powerstroke fuel pump replacement.

In most cases, replacing the fuel pump will be the best cause of action. So what are these signs that you need to check for?

7.3 Powerstroke weak fuel pump

7.3 Powerstroke weak fuel pump Symptoms: Detect failing fuel pump On 7.3 Powerstroke

The fuel pump pumps fuel from the fuel tank to the carburetor in both diesel and gasoline engines. Due to diesel being a thicker liquid and diesel engines using compressed air instead of a spark, a fuel pump is more critical to a diesel engine.

Also called a diesel fuel injection pump, in diesel engines, the failure of the fuel pump can cause the engine not to start. Therefore, if you own a 7.3 Powerstroke truck, knowing the 7.3 bad fuel pump symptoms can help you diagnose the fuel pump problem and decide whether to repair or replace the pump.

Below are some common signs of a 7.3 Powerstroke weak fuel pump that indicate it might be time to replace it

Problems with accelerating

The work of a fuel pump is to supply fuel to the engine block. If the pump is damaged or failing, it will not perform this task efficiently. What results is the engine not having sufficient fuel supply.

This, in turn, results in difficulty accelerating. Therefore one sign that your fuel pump is failing is difficulty accelerating. If you have this problem, it may be time to replace the fuel pump or have it checked.

Low fuel pressure

The second sign on the 7.3 bad fuel pump symptoms list is low fuel pressure. Ideally, the pressure gauge should hover between 40 and 65 PSI. Diesel engines are ignited by hot compressed air, so this pressure is important.

A faulty fuel pump may cause the pressure to drop to below 40 PSI. And when this happens, you may have a hard time starting your vehicle. Thus, if you notice your pressure gauge dropping to under 40 PSI, it is time to check the fuel pump.

Frequent replacing of filters

A clogged-up or dirty fuel pump will translate to you requiring to change the filters frequently. In some cases, you may think it is an issue with the filters. However, if you find yourself changing the filters frequently, a faulty fuel pump may be to blame.

Loss of acceleration and engine stoppage

If your engine is not getting enough fuel fed to it, it may slow down, and notice your vehicle suddenly slows down. In other cases, the engine will stop working altogether because it is starved of fuel. This is usually a sign of a faulty fuel pump that needs to be replaced.

Squeaking or high pitched noises

When you have a faulty fuel pump, you will hear high-pitched or squeaking noises from your engine. Of course, different engines may make a different noise. Nevertheless, you will hear some unusual noise from the engine when driving. When you hear such sounds, it may be time to check the fuel pump and maybe replace it.

Empty fuel bowl

When you crank up the engine, the lift pump injects fuel into the fuel bowl. Therefore, the fuel bowl should have fuel in it. If you notice that the fuel bowl is empty when you crank up the engine, the lift pump may not be injecting fuel into the bowl.

This is another sign of the fuel pump being faulty. Replace it and see if there is a steady stream of fuel being injected into the fuel bowl when you start the engine.

7.3 Powerstroke Fuel Pump Replacement: Process of Replacing a bad fuel pump On 7.3

When you detect any one of the above symptoms, the first thing to do is check that all the other components of the fuel system are ok. Check the fuel bowl for dirt that may have clogged it. If the fuel bowl is clean, the fuel pump may be the culprit.

So how do you replace a faulty fuel pump on a 7.3 Powerstroke truck? We will be coving the replacement process on a 1999-2003 model for this section.

Step 1: Get under the truck

You will need to get under the truck to remove the fuel pump. There is a clip on the fuel pump you will need to remove that. You can use a pocket screwdriver to remove this clip. Also, use a quick-release tool to remove the fuel line that connects to the fuel pump.

Step 2: Remove the electrical connection

This model of the Powerstroke had electrically actuated injectors, so you will need to remove the electronic wiring that connects to the fuel pump. You can use the pocket screwdriver to remove the wiring.

Step 3: Remove the fuel pump

There is a specialized tool you can use to remove the fuel pump. The tool clamps to the front of the fuel pump, and you twist it. Once you twist it, you may get fuel leaking from the pump. Place a bucket underneath to collect the leaking fuel.

Break the white clips that are around the fuel line. You can break this clip as the replacement fuel pump will most likely come with its own replacement clip. Also, remove the break by removing the attachment clip that attaches under the fuel pump.

Step 4: Attach the replacement pump

Remove the fuel lines going into the fuel pump and remove the pump. Once it is out, you can now attach the replacement fuel pump. Connect the two fuel lines on the front and back of the new fuel pump.

Use the locks that come with the replacement pump to secure it in place. To make work easier, use an electric impact ratchet. Once that is done, connect the brake lines to the bottom of the fuel pump.

Connect the electric wiring of the new pump to the electronic wiring harness. Once done, crank the vehicle and check the fuel bowl. The bowl should fill up with fuel now.

Fuel pump replacement costs

The F-250 7.3 diesel fuel pump cost is anywhere between $153 and $282. The labor cost of getting this part replaced will be between $170 and $215. Thus the total replacement cost will come to $324 and $282.

When should I inspect my fuel pump?

It is important to inspect the fuel pump if you notice any of the above symptoms. Also, check the pressure gauge and other components to know if any other parts have a problem. On average, a fuel pump will last you up to 200,000 miles if well maintained.


When you have a problem with your truck’s fuel pump, you will want to get it fixed or replace the fuel pump. Because of how important this part is to diesel engines, you can end up with more expensive problems if not fixed.

Frequently Asked Questions

How does a diesel fuel injection work on 7.3 Powerstroke?

Fuel pumps work in pretty much the same way. They use an electric motor that drives the fluid pump. This pump can either be inside or outside the fuel tank. When fuel is sucked out of the fuel tank, it is pushed through a line to a filter and to the fuel injectors.

Can I drive My 7.3 Powerstroke with a faulty fuel pump?

Driving a car with a faulty fuel pump is not advisable. However, in most cases, the car will not start, and when you are driving, it will keep stalling. Overall, do not drive the car if you suspect a faulty fuel pump before having the issue fixed.

How often should I replace the fuel pump?

There is no specific time when to replace the fuel pump, but replacing it becomes necessary as the mileage increases. Running the car with a fuel tank on low or driving with clogged fuel filters will reduce the lifespan of the fuel pump.

Last Updated on February 2, 2023 by Rifen

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