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post #1 of 3 Old 06-17-2013, 05:01 AM Thread Starter
CJ51973
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1988 YJ Wrangler 
 
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Cap vacuum

I seem to have a lot of vaccum when I remove my gas cap. I didn't have this issue in the past as I hade a bad vent hose on the filler neck. I fixed when I dropped the tank & fixed my rear frame last winter. I removed the hose from the charcoal canister, took out the little orfice and blew in it with the gas cap off. I don't think I was doing anything. Should I be able to blow through the vent line for tank like this? Just thought I'd ask before taking more stuff apart and using the air compressor to find the blockage. Thanks for the help!


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post #2 of 3 Old 06-17-2013, 06:05 AM
Siva283
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Have you checked your rollover valve. I am pretty sure the vent at the gas cap is only for when your fueling up otherwise the gas cap seals it.

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post #3 of 3 Old 06-17-2013, 07:27 AM Thread Starter
CJ51973
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I am talking about making sure I am venting to the charcoal canister during normal run. When I had the bad hose I know it would get air through the cracks in it. Since I have fixed it and it is now hot I get a pretty good hiss each time I take the gas cap off for fuel.
So, I have two of these on opposite sides of the tank (see second picture). And I think this is the cross section of it (first picture). It looks like a spring holds it closed (although it is open in the cross section). So my weak lungs might not push these down. Am I wrong here?
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