Engine Running Rich Due to Fuel Leak Inside Intake Manifold on Chevrolet Caprice

Vehicles using the enhanced vortec V6 engine may be hard to start run poorly and/or use to much fuel due to a fuel leak inside the intake manifold plenum. Commonly this is caused by a leaking fuel pressure regulator or fuel line. The fuel system will need to be pressurized with the upper intake manifold removed in order to determine the exact cause of the leak. Removing the "tuning valve" from the upper intake can allow for limited visual inspection without removing the upper intake manifold.

RepairPal Verified
Average mileage: 220,000 (220,000–220,000)
Engine affected: 5.7L V8
3 model years affected: 1992, 1994, 1995
3 people reported this problem
1 person shared problem details
1992 Chevrolet Caprice- 5.7L V8220,000
Leaking gas from either return line or pressure line
Related Items:
coolant leaks out my 1991 caprice classic but its not the raditor nor the raditor hoes
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases,...
I replaced the thermostat heat was blowing out hot, but could smell antifreeze thru the vents,...
I have a 1991 Chevrolet Caprice with 5.0 liter V-8 which has recently developed a hard starting...
Have have a 93 Chevrolet Caprice and I've been having problems with it losing power when I hit...

Related Content