Fuel pressure is the force exerted by the fuel pump to deliver fuel to the engine’s fuel injectors. Checking fuel pressure is an essential part of diagnosing and repairing fuel system problems.
A fuel pressure gauge can be used to measure fuel pressure. The gauge is connected to the fuel rail, which is the metal pipe that delivers fuel to the injectors. The engine should be running when checking fuel pressure. The gauge will display the fuel pressure in pounds per square inch (psi).