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Old 07-30-2011, 05:49 PM   #1
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would it be harmful to...?

im not passing my evap tast for cali smog...
would it be bad or harmful to anything to just drop the tank and seal off the vent opening all together? no hose or anything? just seal off the tank?

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Old 07-30-2011, 06:01 PM   #2
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I don't see that working out too well with pressure equalization.

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Old 07-30-2011, 06:02 PM   #3
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Ya, bad idea.
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Old 07-30-2011, 06:15 PM   #4
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The vacuum created as the fuel level drops could actually collapse the tank. Vice versa, as you're filling the tank you'd have a lot of trouble with the fuel nozzle cutting off. Bring it to a shop and have it smoke tested. The most common leaks (in general, not specific to Jeeps) are the vent solenoid stuck open from spiders crawling up in there, or the purge solenoid stuck open (leaking into the intake manifold), or just a cracked hose. Smoking it is the right way to go.
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Old 07-30-2011, 07:15 PM   #5
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Quote:
Originally Posted by onroad View Post
The vacuum created as the fuel level drops could actually collapse the tank. Vice versa, as you're filling the tank you'd have a lot of trouble with the fuel nozzle cutting off. Bring it to a shop and have it smoke tested. The most common leaks (in general, not specific to Jeeps) are the vent solenoid stuck open from spiders crawling up in there, or the purge solenoid stuck open (leaking into the intake manifold), or just a cracked hose. Smoking it is the right way to go.

X2 on smoke testing. But don't think for a second that you can do it yourself by just chucking lit matches in there...
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Old 07-30-2011, 09:44 PM   #6
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In cali, we pinch off the hose at the canister that goes to the tank, screw a special cap onto the filler neck and attach a hose that fills it to pressure with nitrogen. at a specified pressure it looks for leakdown.

Have someone with a smoke machine inject smoke into the hose at the canister into the fuel tank, remove the fuel cap until you see smoke, then put the cap on and look for the smoke.

Or, drop your tank and look for cracked hoses, if none, follow the hose to the canister, if thats OK, look at your filler neck hose and filler neck.

We dont functionally check the EVAP purge valve or canister, those are visual.

Regardless, if you dont do it right, have a shop do it right. If we find anything wrong we will fail it. Cali is getting HARD on us smog techs, and sending alot of undercover cars through our shops so we cannot miss anything.
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Old 07-31-2011, 01:56 AM   #7
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just any smoke machine will work? i have a smoke machine somewhere... do i need any pressure in the tank or can i just attach the hose to smoke machine and leave the gas cap on and wait till i see smoke coming out from somewhere? or do i have to stop when i see smoke coming out of the filler? thanks. i dont wana mess anything up worse than it is. gettin my tranny rebuilt right now and cant afford to mess anything else up too bad

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