Mechanics

3.3L FUEL RAIL LEAK

1994 Plymouth Voyager • 6 cylinder 2WD Automatic • 166,000 miles

I have a 1994 Plymouth Grand Voyager and just removed the Air Plenum to replace the spark plug wires. I found that 2 intake manifold bolts were loose, 2 were broken and one was missing. I believe the bolts were broken by a garage that left the broken bolts at some time in the past. Definitely no reason for one of the intake manifold bolts being missing. I removed the intake manifold and replaced the bad bolts. I also cleaned the injectors and replaced all the O-Rings on the injectors. After putting everything back together and starting the car, I found that there was a gas leak that appeared to be coming from the fuel rail or an injector. The rim of the valve cove had gas standing in it. I moved the van out of the basement and into the driveway and checked to see where the leak was coming from. I couldn't determine so I turned the van off. A little later I checked and the leak was gone. I have driven the van around a while but it isn't leaking any more. Would the fuel being de-pressurized cause the fuel rail to leak until the system is repressurized? If not, do you have any idea as to what would cause the leak to stop?
Thanks,
Lee
Avatar
Tl_bright
August 13, 2011.



It takes just a tiny amount of leaked fuel to bleed the pressure off in the system, then any leaking will stop. Rather than running the engine to look for a leak, it's more convenient to bypass the fuel pump relay. I can't remember if your van has a separate relay. If not, bypass the automatic shutdown (ASD) relay, terminals 30 and 87.


Caradiodoc
Aug 13, 2011.