What’s the fix for a bad fuel pump check valve It also retains most of the fuel pressure that was built up by the pump so you’ll instantly have both fuel and pressure when you try to start the engine. The check valve prevents fuel from draining back into the tank once you shut off the engine. Turbine style fuel pump showing the turbine, motor and check valve What the check valve does You know it’s lack of fuel because the engine starts if you spray or pour fuel into the intake or your fuel pressure gauge shows too low a fuel pressure or even no fuel pressure. What we’re talking about here is an engine that must crank for 2-8 seconds before it actually fires up after sitting overnight or for several hours.

Engine cranks a long time before it fires up is sign of a bad check valve in the fuel pump I’ll go through the most common symptoms of a bad fuel pump for fuel injected vehicles. However, newer cars with fuel injection have electric fuel pumps located in the fuel tank and they have different failure symptoms than a mechanical fuel pump. Older cars equipped with carburetors usually have mechanical fuel pumps driven by the camshaft and a follower pin. Symptoms are different between electric and mechanical fuel pumps The point is, perfectly good fuel pumps get replaced because people don’t always know the symptoms of a failing fuel pump or do the proper testing before replacing the pump.

If your engine won’t start, takes too much cranking to start or your engine stalls, you may have a bad fuel pump or you may have a fuel pump wiring issue caused by a corroded connection or ground or a bad fuel pump control module. Repair Topics > Fuel, Fuel pump, Fuel delivery > Symptoms of a bad fuel pump Symptoms of a bad fuel pump What are the symptoms of a bad fuel pump

Bad fuel pump module