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 157 (ENGINE CONTROL SYSTEM - REMOVAL & INSTALLATION)FUEL SYSTEMSFUEL PRESSURE GAUGEINSTALLATION
1999 GMC Forward Control 5.7 R, Automatic
Fuel Pressure Gauge: Installation
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- Release the fuel pressure. See FUEL SYSTEM PRESSURE RELEASE .
- Remove engine cover (1) bolts. See Figure .
- Remove engine cover (1).
- Remove the quick connect coupling cover of the fuel feed hose.
- Using the Fuel Line Disconnect Tool (J 43178), disconnect the quick connect coupling of the fuel feed hose from the fuel feed pipe of the fuel rail. See Figure . Use a shop towel to catch any remaining fuel that may leak.
- Install the Fuel Pressure Gauge Adapter (J 42982) between the fuel feed pipe of the fuel rail and of the fuel feed hose.
- Install Fuel Pressure Gauge (J 34730-1A) to fuel pressure gauge adapter, and tighten securely. See Figure .
- Connect negative battery cable. Tighten clamp bolt to specification. See TORQUE SPECIFICATIONS .
- Turn ignition switch to RUN position to pressurize the fuel system.
- Turn ignition switch to OFF position.
- Check for any fuel leaks.
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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.