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Home >> GMC >> 1998 >> Forward Control 6.5 F >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls - System & Component Testing - 7.4L) >> Fuel System >> Fuel Delivery >> Fuel Pump Oil Pressure Switch (Back-Up Circuit)

Fuel Pump Oil Pressure Switch (Back-Up Circuit)

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To test fuel pump oil pressure switch (fuel pump back-up circuit), start engine. With engine running, disconnect fuel pump relay. If engine stalls, fuel pump oil pressure switch is faulty. If vehicle continues to run, switch is okay.

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