How to diagnose a bad fuel pump on EFI pickup trucks

On electronic fuel injection the light pickup machinery equipment and put it squarely into the field of electronics. The electrical of the present position of the ADD210 in the tank the motor can be cooled around its fuel. Now onboard computer to control it through the use of state-of-the-art drive and high-current relay. Use and now need to test the fuel pump circuit test instrument digital voltage / ohm meter, as well as high-pressure test instrument.

1

Relieve fuel pressure to turn off the engine, remove the fuel tank cap and put a rag under the fuel tube connector to the fuel injector fuel pressure test. Then depress the Schrader valve learn renovation until the fuel stops. Any overflow of the fuel soaked with other clothes.

2

The fuel gauge fuel pressure test device, and tighten to prevent leakage. Hang manometer hook, so that it can not be damaged when the engine is started.

3

Three cycles from the closed position to the Multimeter ADD81 to the run position, the pressure to restore the system. Reading on the pressure gauge indicates the pressure and compare factory specifications listed in the service manual for your the specific vehicle. Low fuel pressure or fuel may indicate the need to replace a fuel pump failure. Pump with auto circuit test instrument to check the power. If the power exists, replace the pump.

4

Starting the engine, and to read the pressure indicated on the meter. Under normal circumstances, this will be approximately 10 psi less than when the engine is turned off. This is due to the fact that: When the engine is off and the fuel pressure regulator is closed open when the engine is started, allowing the fuel to return to the fuel tank. Factory specifications are listed in the engine operation when the reading service manual comparison. Low fuel pressure indicating a failed pump, the need replaced.

5

Turn off the engine and monitoring the fuel pressure for Circuit Tester ADD210. During this period, it should only be slightly decreased. If it rapidly drops to zero, the anti-return valve in the fuel pump failure. According to need to replace the fuel pump.

Posted by: obd2tool at 01:19 AM | No Comments | Add Comment
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