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#1 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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gas tank pressure
I just got back from a long 211 mile journey to a car show in this nice hot weather were having on the east coast. Found out my speedo is off and that apparently I get major pressure in the gas tank. I drove down to a show on thursday and the temp was around the late 70s early 80s, had no issue.. Went back home yesterday and the temp was almost 90, issue.. I stopped at a gas station to get gas. I had about 1/4 tank left. I open the cap and gas and pressure spit out. It was all highway speeds for both trips. Its a 71 blazer, replacement tank, no return lines, vented to rear tank canister, and tank filler line is kinked a little. I've never had an issue but then I never took it on a long journey like that in the hot sun at constant 70 mph. Any ideas or corrections?
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#2 |
Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,515
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Re: gas tank pressure
Sounds like your vent pipe or canister is clogged. Just use a vented cap from a 70 or older model.
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#3 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
does anyone have a manual picture of the vent lines? only because the PO I got the blazer from had a 50 gal tank in it but it leaked and I replaced it with a 21 gal repro tank.
also on the filler neck, there is 2 lines of course the big line is the gas filler line but then another which is the filler vent line. Where does that attach to? I'm sure to tank next to filler spout. |
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#4 |
Registered User
![]() Join Date: Dec 2002
Location: Northern Virginia
Posts: 1,269
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Re: gas tank pressure
mine does that because the PO replaced the tank and didn't have the old neck put on the new tank. It has a hose that collapses. I have to drop the tank and have the old neck put on
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#5 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
Is there an issue with blowing some air into the canister to mix things around?
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#6 |
Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,515
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Re: gas tank pressure
It's charcoal, so nothing to move around. The canister is over 45 years old assuming it's never been replaced, so chances are it's lost it's ability to soak up fuel vapors. Just put a vented cap on and be done with it. Doing this will basically bypass all the EVAP system that most likely doesn't work anymore.
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#7 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
Hemi, Should I use an earlier cap w/o eec?
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#8 |
Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,515
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Re: gas tank pressure
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#9 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
Thanks..
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#10 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
wow, I actually had a vented gas cap on my truck all this time. What could I do to fix this problem?
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#11 |
Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,515
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Re: gas tank pressure
If your tank "spit out" pressure, and you have a vented cap, then the cap is faulty. Clear the obstruction in the vent hole or buy another cap. It ain't rocket science !!
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#12 |
Registered User
Join Date: May 2007
Location: nepa
Posts: 745
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Re: gas tank pressure
LOL.. Understood. 3 times the charm Hemi..
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