QuestionI have a 1983 GMC short box, I have been restoring this vehicle. The gas gauge worked before I stored it last winter, now doesn't work. The tank, and sending unit are new. Do not seem to have any power to sending unit. Is there a fuse? Any suggestions or testing methods?
Thanks
AnswerPROCEDURE
A fuel system pressure test is part of several of the Diagnostic Charts and Symptom Checks. To perform this test, follow this procedure:
Note : To perform residual pressure check refer to: Fuel Pump, Testing and Inspection.
Turn engine OFF to relieve system pressure.
Disconnect negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
Loosen fuel filler cap to relieve tank vapor pressure.
The constant bleed feature relieves fuel pump system pressure when the engine is turned "OFF".
Uncouple fuel supply flexible hose in engine compartment. Install fuel pressure gauge between steel line and flexible hose.
Tighten gauge in line to insure no leaks occur during testing.
Connect negative battery terminal and START engine and observe fuel pressure reading. It should be 62-90 kPa (9-13 psi). If not, refer to DIAGNOSTIC CHARTS/FUEL SYSTEM PRESSURE TEST (CHART A-6).
Turn engine OFF to relieve system pressure.
Disconnect negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
Loosen fuel filler cap to relieve tank vapor pressure.
Remove fuel pressure gauge.
Install new O-ring on fuel feed line. Reinstall fuel line.
Connect negative battery terminal and START engine and check for fuel leaks.
Install air cleaner assembly.
There is also a relay on the passenger side front if you need more info go to my website collisionrepairadvice.com
