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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 228 (ENGINE CONTROLS - REMOVAL & INSTALLATION)FUEL SYSTEMSFUEL LINE DISCONNECT FITTINGSREMOVAL & INSTALLATION (PLASTIC COLLAR)
1999 GMC Forward Control 5.7 R, Automatic
Removal & Installation (Plastic Collar)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal & Installation (Plastic Collar)
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Use safety glasses when using compressed air to prevent eye injury. Always apply a few drops of clean engine oil to the male pipe ends before connecting the fuel pipe fittings in order to reduce the risk of fire and personal injury. This will ensure proper reconnection and prevent a possible fuel leak. During normal operation, the "O" rings located in the female connector will swell and may prevent proper reconnection if not lubricated.
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Blow any dirt out of the disconnect fitting using compressed air. Squeeze the 2 plastic retainer release tabs and pull the connection apart. See Figure .
- To install, ensure fuel line and disconnect fitting are clean. Lubricate fuel line and disconnect fitting with clean engine oil. Push both sides of disconnect fitting together to cause plastic retainer release tabs to snap into place. After connecting fitting, ensure connection is secure by pulling on both sides of disconnect fitting.
- Connect negative battery cable. Tighten battery cable bolt to specification. See TORQUE SPECIFICATIONS . Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.
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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.