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12-13-2005, 01:56 AM
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#1 |
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Registered User
Join Date: Jul 2005
Location: SK, Canada
Posts: 488
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pressure in gas tank?
Today when I spun the gas cap off of my truck it made a "pshht" sound like it was releasing pressure or letting air in, but I don't know which. What could have caused that?
My guess is that I messed something up by removing the carbon canister and just plugging the return line. Was that also the way that air is allowed back into the tank?
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Evan B. |
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12-13-2005, 09:18 AM
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#2 |
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STILL PLAYS WITH TRUX
Join Date: Nov 2002
Location: Melbourne, Fla.
Posts: 2,764
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Re: pressure in gas tank?
Is this the '78 in your sig?
I would undo what you messed with and see if it still does it. |
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12-13-2005, 12:41 PM
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#3 |
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www.73-87chevytrucks.com
 
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: pressure in gas tank?
Sounds like you plugged the vent line. What all did you plug? I think you can get a vented gas cap.
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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12-13-2005, 01:03 PM
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#4 |
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Registered User
Join Date: Jul 2005
Location: SK, Canada
Posts: 488
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Re: pressure in gas tank?
Yes, my truck is a '78 and it originally came with a carbon canister, mounted in the engine bay behind the driver side headlight, that retrieves unburnt fuel to (I think) route it back to the gas tank. When I did the swap from 305 to 350 I also got a new Edelbrock carburator, so I didn't think I was able to hook the canister back up. Once I had all of the hoses unplugged from it, the only unused hose left in the truck was one line that goes back to the gas tank. That is the one that I plugged.
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Evan B. |
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12-13-2005, 01:05 PM
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#5 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: pressure in gas tank?
If you run the motor for very long peroids without a lot of gas in the tank it can cause trouble. Either redo what you did or put a vented cap on it or a vent line. If it sucks on the tank long you will wear the fuel pump out quicker, and it could cause vacum troubles in the fuel system.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71  Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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12-14-2005, 04:16 AM
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#6 |
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Registered User
Join Date: Jul 2005
Location: SK, Canada
Posts: 488
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Re: pressure in gas tank?
I think I've figured out what it is for sure. On the recommendation of a buddy, I pulled out what I now know is the fuel vapor caniser and just plugged the line that goes to the gas tank. So... now I have to put it back in. I've got my trusty Haynes manual but it doesn't show where the hoses are routed.
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Evan B. Last edited by evan; 12-16-2005 at 08:05 PM. |
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