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Topic: Fountain of gas from fill nozzle

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

Fountain of gas from fill nozzle

Posted: 4/17/25 2:00pm Message 1 of 7
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FORT MYERS, FL - USA
Joined: 4/23/2020
Posts: 18
Vette(s): 1982 Collectors Edition

Hey Everyone,

Had a very weird thing happen to me at the gas station yesterday.  First of note, I have replaced my gas cap with one that you don't have to remove to put gas in.  So, started to fill up as normal, holding the handle.  When it clicked I released the handle and started to pull out the nozzle.  Immediately gas started fountaining up out of the gas tank through the cap.  Needless to say I got covered!  There was quite a bit that came out.  It has never done that before on a fill up.  Almost seemed like there was pressure inside the tank pushing the gas out.  Any ideas on what might have caused it?  I am almost dreading my next fill up.

 

Thanks,

Dennis




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Re: Fountain of gas from fill nozzle

Posted: 4/17/25 8:23pm Message 2 of 7
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Cana, VA - USA
Joined: 7/3/2016
Posts: 372
Vette(s): 1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box

The only thing I can think of is if the fill nozzle was a relative tight fit into the gas cap fitting, that could have built up pressure.




   

Re: Fountain of gas from fill nozzle

Posted: 4/17/25 9:06pm Message 3 of 7
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

If you have never had this happen before replacing the fuel cap, then you are definitely pressurizing the tank as you put fuel in. Air has to escape from somewhere....usually out the fill tube. The new cap is sealing too well, and not venting the air as the fuel goes in. The tank is designed to be a sealed unit, and vented as needed thru the fuel evap system. Sorry to say, you're likely going to have to re-install your factory style fuel cap, or...remove the "no touch" cap when you put fuel in, making it kinda useless....🙁




Joel Adams
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Re: Fountain of gas from fill nozzle

Posted: 4/17/25 10:20pm Message 4 of 7
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Grapevine, TX - USA
Joined: 8/26/2006
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Vette(s): 1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.

Go back to your old gas cap.




   

Re: Fountain of gas from fill nozzle

Posted: 4/18/25 6:00am Message 5 of 7
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FORT MYERS, FL - USA
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Vette(s): 1982 Collectors Edition

Cap has been on there for 4 years now without an issue but yes, it might be time to replace it.




Re: Fountain of gas from fill nozzle

Posted: 4/18/25 9:20pm Message 6 of 7
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

You may need to check your evap system for a clogged hose, or bad purge solenoid. If you do not have the Factory Service Manual for your car, I can send you a diagnostic chart. 




Joel Adams
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My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: Fountain of gas from fill nozzle

Posted: 4/19/25 6:32am Message 7 of 7
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FORT MYERS, FL - USA
Joined: 4/23/2020
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Vette(s): 1982 Collectors Edition

I do have a factory service manual so will take a look and see if there is an issue with those components.  Thanks!!




in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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