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 230 (ENGINE CONTROLS - REMOVAL & INSTALLATION)FUEL SYSTEMSFUEL TANKFUEL TANK CLEANING
1999 GMC Forward Control 5.7 R, Automatic
Fuel Tank Cleaning
1999 GMC Forward Control 5.7 R, AutomaticSECTION Fuel Tank Cleaning
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering the open pipes and passages. Only use oil-free compressed air in order to blow out the fuel pipes. If the fuel filter is plugged, the fuel tank should be inspected internally and cleaned if necessary. When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water in accordance with all applicable local, state, and federal laws and regulations.
- Remove the fuel sender assembly from fuel tank. Inspect the fuel pump fuel strainer. If the fuel pump fuel strainer is contaminated, the fuel pump fuel strainer must be replaced. See Figure . Inspect the fuel pump inlet for dirt and debris. If dirt and debris are found, the fuel pump needs to be replaced.
- Flush the fuel tank with hot water. Pour the water out of the fuel sender assembly opening in the fuel tank. Rock the fuel tank in order to be sure that the removal of the water from the fuel tank is complete. Allow tank to dry completely before reassembly.
- Disconnect fuel pipes at engine compartment fuel pipes. See FUEL LINE DISCONNECT FITTINGS . Clean the fuel pipes by applying air pressure in the opposite direction of the fuel flow. Connect the fuel pipes to the engine compartment fuel pipes.
- Replace the fuel filter. See FUEL FILTER . Install the fuel sender assembly. Install the fuel tank.
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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.