LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Fuel leaking from transmission (flywheel area)

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Old Dec 28, 2011 | 03:16 PM
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z28er_kgb's Avatar
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Fuel leaking from transmission (flywheel area)

There's a steady leak of fuel coming from the flywheel area around where the transmission hooks up to the engine. I checked the oil and it had the smell of gas in it. I don't want to start it in case it sparks and catches fire. Any ideas what this might be and how to fix it??
Old Dec 28, 2011 | 03:36 PM
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Kevin Blown 95 TA's Avatar
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Re: Fuel leaking from transmission (flywheel area)

Your fuel lines connect to the fuel rails at the rear driver's side of the intake manifold, so it's possible you got a bad o-ring on one of the connections - supply line probably, or maybe return line. Another possibility might be a leaky fuel regulator, which is also right there in the same spot.

If you're getting gas in your engine oil, then I would suspect leaky injector(s).

Last edited by Kevin Blown 95 TA; Dec 28, 2011 at 03:38 PM.
Old Dec 28, 2011 | 03:58 PM
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Re: Fuel leaking from transmission (flywheel area)

Thanks. I checked the fuel lines behind the intake manifold and they arent leaking on the driver side but there is a line behind the intake manifold on the passenger side that is leaking gas what is this line? i felt around it and there is no cracks is there a gasket on it? its right behind the valve cover on the previously mentioned side right above the tranny bellhousing.
Old Dec 28, 2011 | 04:20 PM
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Re: Fuel leaking from transmission (flywheel area)

a hard metal line? not the tube from the intake to the manifold? and your not talking about the water tube from head to head are u?

if there is indeed fuel leaking its coming from the back of the rail or maybe a puncture in a fuel line? hows the fpr? is it leaking and just running down the back of the motor?
Old Dec 28, 2011 | 04:38 PM
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Re: Fuel leaking from transmission (flywheel area)

Yes hard metal line. No not the tube from intake to manifold and not the water tube.Fpr not leaking. Any idea what line this is? And i felt around the line no cracks it has a bolt onto the back of the engine around the valve cover area and that is where its leaking from.
Old Dec 28, 2011 | 06:08 PM
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Kevin Blown 95 TA's Avatar
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Re: Fuel leaking from transmission (flywheel area)

Take a pic of it or draw a diagram or something - you're not giving us very good information, and we know these cars pretty well.
Old Dec 28, 2011 | 08:58 PM
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Re: Fuel leaking from transmission (flywheel area)

I'll try to post a pic. But I probably won't be able to untill this weekend because by the time I get off work its dark.
Old Dec 28, 2011 | 10:24 PM
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Originally Posted by z28er_kgb
I'll try to post a pic. But I probably won't be able to untill this weekend because by the time I get off work its dark.
.

Possibly the fuel rail crossover tube?.

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Old Dec 28, 2011 | 10:52 PM
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Re: Fuel leaking from transmission (flywheel area)

Take a look at Shoebox's pics and see what looks familiar:

http://shbox.com/1/fp_reg.jpg

http://shbox.com/1/egr1.jpg

Pull the vacuum line off the fuel pressure regulator and see if it has wet fuel in it.
Old Dec 29, 2011 | 05:53 PM
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Re: Fuel leaking from transmission (flywheel area)

felt like it was leaking from the metal pipe in front of the exhaust gas feed line shown on http://shbox.com/1/egr1.jpg
Old Dec 30, 2011 | 06:57 AM
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Re: Fuel leaking from transmission (flywheel area)

Originally Posted by z28er_kgb
felt like it was leaking from the metal pipe in front of the exhaust gas feed line shown on http://shbox.com/1/egr1.jpg
That's the steam pipe that connects the water jacket from head to head. Fuel is not leaking from there. If you are sure it's fuel.

Where are you searching for fuel, from under the car?

Why don't you pressurize the fuel system with the fuel pump prime connector and look in the back area you mentioned with a mirror.

More than likely it's the fuel or return line line leaking and running down the back of the intake.

It also would not be a bad idea to check to be sure the schrader valve is tight on the fuel rail.

Use a fuel pressure gauge to see if the FP is up to par if you still can't find the leak.
Old Dec 31, 2011 | 10:42 AM
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Re: Fuel leaking from transmission (flywheel area)

Will do thanks.
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