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Home >> GMC >> 1998 >> Forward Control 4.3 W, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - System & Component Testing - 7.4L) >> Fuel System >> Fuel Delivery >> Fuel Pump Oil Pressure Switch (Back-Up Circuit)
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Fuel Pump Oil Pressure Switch (Back-Up Circuit)

WARNING: This page is about a different variant/trim than selected.

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.