gas tank pressure bild up (1 Viewer)

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Jan 14, 2009
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sofaroffroad>U.S.A.
 
hi ,have a fj80,and after driving it ,open gas cap and a lot of gas pressure in there,any help in a fix or where to look at what is wrong.
 

Clutchee

I'm fun sized!
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Apr 19, 2004
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Hotel M-F, home weekends!
 
 
 
Look at the charcoal canister being plugged, basically it acts as a filter & if it plugs then tremendous pressure builds in the tank & lines going back.

Look in the FSM & look under the charcoal canister checks, basically their is a test in which air passes through certain ways....... their is also a cleaning method.

Hope this helps, we fixed a buddies at Tellico using the manual-his was also building heat.
 

CJF

Joined
May 31, 2005
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7,013
 
 
 
Look at the charcoal canister being plugged, basically it acts as a filter & if it plugs then tremendous pressure builds in the tank & lines going back.
Ah.

That's a much better response than mine. :lol:

Question: Shouldn't a properly functioning cap still vent any excess pressure (even if the canister's clogged), or does it not work that way?

Curtis
 
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Feb 6, 2009
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Ah.

That's a much better response than mine. :lol:

Question: Shouldn't a properly functioning cap still vent any excess pressure (even if the canister's clogged), or does it not work that way?

Curtis
I dont' believe they work that way. :cheers:
 

landtank

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Mar 27, 2003
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Groveland MA
 
 
 
on the later 80 the charcoal canister is vented through the bottom via a hose to inside the frame rail. The part that mounts to the frame rail can become rusted to a point where it will be plugged. A local guy had two gas tanks pressurize to the point of failure do to this.
 
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sofaroffroad>U.S.A.
 
where do i find the charcoal canister on the fj80,and how do ya clean it,i don't have a book yet,also where to find 1
 
Joined
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sofaroffroad>U.S.A.
 
on my truck,behind the battery is a big round canister for the air filter.any other place it can be and what does it look like
 
Joined
Jan 14, 2009
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385
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sofaroffroad>U.S.A.
 
so we are all here looking for a fix,so back to the charcoal canister,how do ya repair it/clean it or check the system, looking for help.standing by.
 
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Gilbert, AZ
 
FWIW, I replaced my canister and still have the pressure problem. Must be the VSV or vacuum diaphram not pulling fumes through the canister.
 

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