a new one on me! can not see how it could run, check your oil first!!!! see if you are over filled, gas, in oil, is a catastrophy, waiting to happen
C4 leaking fuel from exhaust
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 29
Likes: 2
From: Lake Tahoe NV
C4 leaking fuel from exhaust
So I came back from deployment to Iraq last week and the car (85 coupe) was running great until the night before last. It started running rough and on its way home it lost 3/4 of a tank in about 25 miles of driving. I started it up yesterday and it is leaking fuel (quite alot) out of the exhaust. It's getting pushed all the way out back, although most of it is leaking out of the mufflers. I'v been researching possible causes on the boards. I've inspected the fuel lines as I've read they are prone to rusting through, but they are intact and dry. It definetly seems that the fuel is coming all the way from the engine. Could stuck fuel injectors dump this much fuel? Or am I possible looking at a bad FPR or perhaps a blown head gasket?
Steve
Steve
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
So I came back from deployment to Iraq last week and the car (85 coupe) was running great until the night before last. It started running rough and on its way home it lost 3/4 of a tank in about 25 miles of driving. I started it up yesterday and it is leaking fuel (quite alot) out of the exhaust. It's getting pushed all the way out back, although most of it is leaking out of the mufflers. I'v been researching possible causes on the boards. I've inspected the fuel lines as I've read they are prone to rusting through, but they are intact and dry. It definetly seems that the fuel is coming all the way from the engine. Could stuck fuel injectors dump this much fuel? Or am I possible looking at a bad FPR or perhaps a blown head gasket?
Steve
Steve
Welcome back, I know I appreciate what you've done and are doing for this country!
Are you sure it is not just H20 concensation build up from the car being parked outside? Not likely to be the FPR....a stuck open injector is more likely.
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 29
Likes: 2
From: Lake Tahoe NV
No it is definetly fuel. There is also a strong fuel odor aroung the manifold however I can not see any leaks or puddles on the manifold. If you put your hand over the exhaust it will spray your hand and it leaks so much out the mufflers that it puddles guite quickly.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Ok so it is fuel. If you see no fuel around around the intake manifold then I'd look at and hook up fuel pressure gage to the rail and see what kind of pressure you got. If it is over 50psi then your FPR/FPR diaphram is blocked and is forcing all the fuel through the injectors instead of returning part of it to the tank. I'd check the pressure with out starting the engine if it is sparying that much fuel. Turn the key to the run position and the pump should prime for 2 seconds or so.....and check the pressure.
Your going to want to change the oil out for sure before you drive the thing again.
Your going to want to change the oil out for sure before you drive the thing again.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 29
Likes: 2
From: Lake Tahoe NV
I don't have a fuel pressure gauge on me. I will be able to get at one tomorrow and confirm the exact pressure. However it will spit fuel from the FPR hose when the hose is disconnected.
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Thread Starter
Intermediate
Joined: Aug 2006
Posts: 29
Likes: 2
From: Lake Tahoe NV
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Last edited by engle1147; Nov 14, 2008 at 01:52 AM.
