Electric fuel pumps are one of the most critical and important parts of a vehicle. Usually, it is not uncommon for these pumps to last the whole life of a vehicle but there are times when you need to diagnose a problem and perform a repair.
The most common cause of fuel pump failures is frequent running of the lank low on fuel that results in overheating of the motor. The second common cause of fuel pump failure is fuel contamination wherein rust and dirt particles that clog the fuel strainer and thereby prevent the fuel pump from drawing enough of fuel under high engine load. Contamination can jam the pump and thereafter stop the engine immediately if it gets past intake strainer of the pump.
Let us read about some possible fuel pressure problems and fuel solenoids to gain a clear and complete understanding.
Low fuel pressure can be a result of a damaged or worn out fuel pump, a clogged fuel filter, high resistance in the fuel pump circuit, or a faulty pressure regulator. An easy to load-test the pump, on older vehicles with a return-type fuel system, is to directly connect the gauge to the fuel supply line. Thereafter, you can the pump to measure its “deadhead” or maximum pressure. If the vehicle has a mechanical return-less fuel supply system, you can load-test the pump with a connected pressure gauge.
If you want to test a fuel pump, you can use a digital volt/ohm meter (DVOM) to measure the current flowing through the circuit. By doing this, you can find out if the current draw is extremely low to indicate a high level of resistance somewhere in the circuit. A general rule-of-thumb says that the flow of current should be about half the fuse rating with the pump under load.
If you want more assistance on how to diagnose and repair your vehicle, you can simply the website of Foster Truck.