car diagnosis tool

The way to Diagnose a Undesirable Fuel Pump on an EFI Pickup 1Relieve the fuel pressure by turning the engine off Obd2 scanner, removing the fuel filler cap, and placing a rag under the fuel pressure test fitting situated on the fuel line attached to the injectors. Then depress the schrader valve in the gauge fitting until fuel stops operating out.

 Soak up any spilled fuel with extra rags.2Attach the fuel pressure gauge towards the fuel pressure test fitting car diagnosis tool, and tighten it securely to stop leaks. Hang the gauge by its hook, so it could not be damaged when the engine is began.3Cycle the ignition essential from the off position to the run position three instances to restore technique pressure. Study the pressure indicated on the gauge and compare for the factory specifications listed in the service manual for your specific vehicle. Low fuel pressure or no fuel could indicate a faulty fuel pump in require of replacement.

Verify for power in the pump using the automotive circuit tester. If power is present, replace the pump.4Start the engine, and read the pressure indicated on the gauge. It's going to normally be about 10 p.s.i. reduce than when the engine is off. That is as a result of the reality that the fuel pressure regulator is closed when the engine is off and opens when the engine is started, permitting fuel to return to the fuel tank. Compare the engine operating reading to factory specifications listed within the service manual. Low fuel pressure indicates a faulty pump that requirements replacement.5Turn the engine off and monitor the fuel pressure for ten minutes. It should really only drop slightly throughout this time. If it drops to zero quickly, the anti-drain back valve within the fuel pump is faulty. Replace the fuel pump as necessary.