C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Gas fumes

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Old Aug 11, 2014 | 09:43 AM
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Default Gas fumes

Recently had intake gaskets, egr, oil sending unit, injector O-rings installed. Smell gas fumes while driving. runs and idles good. Don't see any signs of a leak. It's a 1987 L98. Any ideas? thanks for listening

Last edited by BishShip3; Aug 11, 2014 at 10:42 AM.
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Old Aug 11, 2014 | 11:10 AM
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Do not continue driving the car until the problem is fixed! And do not park it inside a garage. You've got fuel spraying or leaking somewhere, and that's a recipe for a fire. We don't need another picture of a C4 in flames.
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Old Aug 11, 2014 | 08:19 PM
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..... Check the Charcoal Canister Purge for proper connections and operation ... make sure that the plastic piping from the canister to the throttle body is not broken ..........
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Old Aug 11, 2014 | 09:35 PM
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Check the driver's side - rear of the intake area on the fuel rail - that's where the tube feeding the cold start injector is. It's an easy one to miss -
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Old Aug 12, 2014 | 02:08 AM
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Pull the vacuum line off the fuel pressure regulator and turn on the ignition without starting the engine. No fuel should come out of the FPR. If fuel does come out then you need to replace the FPR or the diaphragm inside.

When my FPR diaphragm ruptured I had a fire in the engine compartment, so you need to check this ASAP.

There is one other possibility. There is a rubber hose that joins two metal parts of the vapor line from the fuel tank to the charcoal canister. If that hose is damaged or missing then you can get a fuel vapor smell. It's located in front of the rear tire on the driver's side:


Last edited by Cliff Harris; Aug 12, 2014 at 02:12 AM.
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Old Aug 12, 2014 | 02:22 PM
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Originally Posted by Cliff Harris
Pull the vacuum line off the fuel pressure regulator and turn on the ignition without starting the engine. No fuel should come out of the FPR. If fuel does come out then you need to replace the FPR or the diaphragm inside.

When my FPR diaphragm ruptured I had a fire in the engine compartment, so you need to check this ASAP.

There is one other possibility. There is a rubber hose that joins two metal parts of the vapor line from the fuel tank to the charcoal canister. If that hose is damaged or missing then you can get a fuel vapor smell. It's located in front of the rear tire on the driver's side:

thanks, I'll try these
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Old Aug 12, 2014 | 02:23 PM
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Originally Posted by jake corvette
Check the driver's side - rear of the intake area on the fuel rail - that's where the tube feeding the cold start injector is. It's an easy one to miss -
Sounds easy enough. maybe I'll get lucky
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Old Aug 12, 2014 | 02:24 PM
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Originally Posted by C409
..... Check the Charcoal Canister Purge for proper connections and operation ... make sure that the plastic piping from the canister to the throttle body is not broken ..........
Sounds like a good place to start. Thanks
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I had a gas smell on my 86 coupe. There is a small rubber hose behind the driver's seat under the car. The hose was covered with some under coating and I had dig around it. The hose was dry rotted and barely there. The hose is only 2-3 inches long but; it was my gas smell.
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