Test NTC-3B - Checking Fuel Pressure
NOTE:
Perform TEST NTC-3A before proceeding.
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .
- Using scan tool, stop ASD fuel system actuation. Apply parking brake. Place shift lever in Neutral. Start engine. While monitoring fuel pressure gauge, momentarily snap throttle wide open increasing engine speed to more than 3000 RPM.
- If fuel pressure does not decrease to less than 35 psi (2.5 kg/cm2 ), fuel pressure is normal. Test is complete. Release fuel pressure. Remove fuel pressure gauge. If fuel pressure decreases to less than 35 psi (2.5 kg/cm2 ), go to next step.
- Allow engine to idle. Place shift lever in Park. Turn ignition off. Inspect chassis fuel supply line for kinks or restrictions. If no kinks or restrictions exist on chassis fuel supply line, go to next step. If a kink or restriction exists in chassis fuel supply line, release fuel pressure and repair or replace chassis fuel supply line as necessary. Perform TEST VER-2A.
- Release fuel pressure. Remove fuel pressure gauge.
- Remove fuel filter. Adjust a shop air hose to 40 psi. Using shop air at 40 psi, attempt to blow air through fuel filter inlet. If fuel filter is restricted, replace fuel filter. Perform TEST VER-2A. If fuel filter is not restricted, replace fuel pump. Perform TEST VER-2A.