In volume 4 for the 1998 7.4 page 1672, (6-2749)
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Wrap a shop towel around the fuel pressure connection to absorb any small amount of fuel leakage that may occur when installing the fuel pressure gauge. Turn ON the ignition, the fuel pressure should be 385-430 kPa (56-62 psi). This pressure is controlled by a spring pressure within the regulator assembly.
4. The fuel pressure that continues to fall is caused by one of the following items:
• The in-tank modular fuel sender is not holding pressure.
• The fuel pressure regulator valve is leaking.
• An SFI injector is leaking.
• Fuel line is leaking
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Wrap a shop towel around the fuel pressure connection to absorb any small amount of fuel leakage that may occur when installing the fuel pressure gauge. Turn ON the ignition, the fuel pressure should be 385-430 kPa (56-62 psi). This pressure is controlled by a spring pressure within the regulator assembly.
4. The fuel pressure that continues to fall is caused by one of the following items:
• The in-tank modular fuel sender is not holding pressure.
• The fuel pressure regulator valve is leaking.
• An SFI injector is leaking.
• Fuel line is leaking