Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1991JIMMY 5.7 K, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATIONFUEL SYSTEM (GASOLINE)FUEL DELIVERY (GAS)FUEL MODULE (7.4L, 5.7L G VAN & 5.7L OVER 8500 GVWR)
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8
Fuel Module (7.4L, 5.7L G Van & 5.7L Over 8500 GVWR)
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8SECTION Fuel Module (7.4L, 5.7L G Van & 5.7L Over 8500 GVWR)
Fuel module overrides the ECM 2-second timer and fuel pump runs 20 seconds before shutting off when vehicle is not started. This added circuit corrects hot restart problems which could cause vapor lock during high ambient temperatures.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.