What Are The Symptoms Of A Bad Fuel Pump?

bad fuel pump

A fuel pump is a mechanical device that moves fuel from the tank to the carburetor or injectors in an internal combustion engine. It plays an important role in keeping the engine running smoothly and efficiently.

Fuel pumps come in different designs, but most operate using a diaphragm and a check valve. As the engine’s pistons move up and down, they create a suction force that draws fuel from the tank and into the pump. The diaphragm is activated by this suction force, which then pressurizes the fuel and sends it to the carburetor or injectors. Check valves are used to prevent fuel from flowing back into the pump, which would cause it to overheat and fail.

Fuel pumps are designed to withstand high temperatures and pressures, but they can still experience wear and tear over time.

How To Know If Your Fuel Pump Is Bad?

There are a few telltale signs that your fuel pump may be going bad.

If your car is having trouble starting, or if it’s sputtering and stalling, that could be a sign that the pump isn’t delivering enough fuel to the engine.

You may also notice that your car is losing power when climbing hills or accelerating, as the pump struggles to deliver fuel under increased demand.

How To Diagnose A Bad Fuel Pump?

Your car is cranking but not starting

If when starting your engine, you can hear it cranking but not starting, it can be a symptom of a bad fuel pump.

Check the fuse

One way to check the condition of the fuel pump is to check the fuse. If the fuse is blown, it may be an indication that the fuel pump is not receiving enough power and needs to be replaced. In addition, checking the fuse can also help to diagnose other problems with the fuel pump, such as a short circuit. Therefore, checking the fuse is an important step in troubleshooting any issues with the fuel pump.

Use a fuel pressure gauge

A fuel pressure gauge is a diagnostic tool that allows you to check the health of your car’s fuel system. It can be used to test the fuel pressure in the fuel rail, as well as the pressure of the fuel injectors. To use a fuel pressure gauge, simply attach it to the Schrader valve on the fuel rail and turn on the ignition. The needle on the gauge will indicate the current pressure. If the needle is reading below the normal range, it may be an indication that there is a problem with the fuel pump or injectors. In this case, it is best to consult a professional mechanic for further diagnosis. However, if the pressure is within the normal range, it is likely that the problem lies elsewhere in the car’s engine. In either case, a fuel pressure gauge can be a valuable tool for diagnosing engine problems.

How Much Does It Cost To Get A Fuel Pump Replaced?

When a fuel pump fails, it can be very expensive to replace. Depending on the make and model of your car, a fuel pump replacement can cost anywhere from $500 to $1500. Most of the cost from the labor. Usually, to replace the fuel pump, the complete thank has to be disassembled which explains the high cost.


A bad fuel pump can cause a lot of problems with your car. Symptoms of a bad fuel pump include difficulty starting the engine, sputtering and stalling, and losing power when accelerating. If you are experiencing any of these symptoms, it is important to have your car checked by a professional mechanic. A fuel pressure gauge can be used to test the health of the fuel system, and if the pressure is low, it is likely that the fuel pump needs to be replaced. Replacing a fuel pump can be very expensive, so it is important to catch any problems early on.

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