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12-10-2002, 05:03 PM
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#1 |
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Hot Rods For Life
Join Date: Sep 2001
Location: Waxahachie, TX
Posts: 3,305
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Should I get a big sucking swooshing sound (vacuum) when I pull my gas cap off?
I noticed the "Gas Smell" post and I am having the same type of problems. Should I get a vented cap?
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12-10-2002, 05:11 PM
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#2 |
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Tha Russian Canadian
Join Date: Nov 2000
Location: Lethbridge, AB
Posts: 358
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Yes you should.
I've seen tanks with so much pressure that as soon as you twists the cap, it gets shot at you. So i can't see how that much preasure can be good for the tank.
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Dimitri Lethbridge, Alberta 69 Chevy C10 - (Under Construction) pos_8@hotmail.com |
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12-10-2002, 06:12 PM
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#3 |
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Registered User
Join Date: May 2000
Location: Victoria, BC, Canada
Posts: 2,409
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I usually get back pressure on hot summer days. Been looking for a vented cap but they seem to be rare as hen's teeth in these parts. I'm using an aftermarket locking cap right now and I sometimes reach back and push in on the gasket to release excess gas fumes while driving.
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. |
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12-10-2002, 06:17 PM
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#4 |
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"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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No you shouldn't. The gas caps for 71 and 72 were non-vented and 67-70 were vented. If your cap holds a vacuum or pressure, then the cap is not vented. Either it has become plugged, or it is a 71-72 cap.
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 |
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12-12-2002, 01:50 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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Venting
Getting that much pressure in the tank can cause other problems also. It can starve the carb in hot weather, stubbling when accelarting, and it could colaspe the gas tank in some cases, if you can't find the caps try routing a peice of fuel line some how to vent it.
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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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