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11-27-2018, 10:51 AM
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#1 |
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Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Fuel leak
Greetings
 What causes fuel to pour out of the tank filler neck after starting the engine. I’ve a 1986 GMC Sierra C2500 that I swapped the engine to LS with auto transmission, factory dual fuel tanks, factory fuel sending units, finished 1 year ago, but never used the truck due to issues with the conversion. It was stored for about 4 months, but it ran ok when it came from the workshop. I fixed some wiring and I started it yesterday, it started ok, but I noticed fuel started pouring out from the left tank filler neck, it feels the tank is pressurized. Shut down the engine, disconnected the battery, but fuel kept pouring for about 5 minuets. Anyone know why? Causes? Solutions? Thanks
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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11-27-2018, 10:55 AM
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#2 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,251
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Re: Fuel leak
Never heard of that. I would try to remove gas cap and see if it still happens. If it dosent, I would replace cap. Also, you can try disconnecting the vent line at the canister under the engine to see if that is causing tyhe pressure to not release. My guess though is the gas cap.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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11-27-2018, 11:57 AM
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#3 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,620
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Re: Fuel leak
Somehow fuel from right tank being returned to the left tank? Check for hoses crossed at valve. Possible valve has internal failure.
Might try switching tank switch to other side and see if problem swaps sides. |
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11-27-2018, 01:06 PM
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#4 | |
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Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: Fuel leak
Quote:
I’m not sure if there is canister, but I’ll check
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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11-27-2018, 01:08 PM
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#5 | |
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Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: Fuel leak
Quote:
__________________
1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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11-27-2018, 01:09 PM
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#6 | |
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Registered User
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,816
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Re: Fuel leak
Quote:
good luck!
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I started out with nothing - and I still have most of it |
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