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Home >> GMC >> 1994 >> Forward Control 5.7 K, L05, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - Gasoline >> Fuel System >> Fuel Delivery >> Fuel Pump Oil Pressure Switch (Back-Up Circuit)
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Fuel Pump Oil Pressure Switch (Back-Up Circuit)

To test fuel pump oil pressure switch 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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