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post #1 of 9 Old 06-02-2020, 08:39 AM Thread Starter
dd123c5
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Gas Tank Pressure

I got a 97 Sport, and whenever i screw the gas cap on at all and have any less than a full tank an immense amount of pressure starts building up, so as when i remove it its like a reverse vacuum. I already tried to replace the gas cap, and the only other thing else i can think to replace is the gas tank vent hose, but i cant do that myself so i just wanted to make sure there wouldn't be anything else i could try before getting the whole gas tank removed.

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post #2 of 9 Old 06-02-2020, 10:30 AM
jtec
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I would suspect there would be EVAP system codes, did you scan for codes?

Are you sure it is pressure and not under vacuum ? Both would be an air rushing sound,

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 9 Old 06-02-2020, 12:16 PM Thread Starter
dd123c5
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Originally Posted by jtec View Post
I would suspect there would be EVAP system codes, did you scan for codes?

Are you sure it is pressure and not under vacuum ? Both would be an air rushing sound,
The check engine came on one time but only lasted like 10 mins and couldnt check, and yes its pressure it blows the cap off before i even unscrew it all the way
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post #4 of 9 Old 06-02-2020, 07:56 PM
jtec
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look at the vent line, from tank to EVAP canister under hood - is this line plugged?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 9 Old 06-03-2020, 04:00 PM
PimaXJ
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Canister fires are not unheard of, caused by gasoline reaching the canister. Often caused by overfilling & not stopping when the pump first clicks off. There is a filter on the canister as I recollect. Do be careful!
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post #6 of 9 Old 06-03-2020, 07:28 PM Thread Starter
dd123c5
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Originally Posted by jtec View Post
look at the vent line, from tank to EVAP canister under hood - is this line plugged?
is there a diagram to find this cant seem to find were it is
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post #7 of 9 Old 06-03-2020, 07:30 PM Thread Starter
dd123c5
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Originally Posted by PimaXJ View Post
Canister fires are not unheard of, caused by gasoline reaching the canister. Often caused by overfilling & not stopping when the pump first clicks off. There is a filter on the canister as I recollect. Do be careful!
i am not sure how this is relevant to my problem but no i do not overfill my tank .
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post #8 of 9 Old 06-04-2020, 07:44 AM
jtec
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pressure is unusual - guessing it may be heat expansion - the tank vents thru the line to the canister which stores fumes. The PURGE valve will send the fumes to engine when PCM commands purge.

The engine is STOCK the canister is there - no plugged lines?
Look at the emission decal (if still there) to help ID Evap lines...

Do you have any issues refueling - nozzle kicks off often?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 9 Old 06-04-2020, 05:55 PM Thread Starter
dd123c5
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Originally Posted by jtec View Post
pressure is unusual - guessing it may be heat expansion - the tank vents thru the line to the canister which stores fumes. The PURGE valve will send the fumes to engine when PCM commands purge.

The engine is STOCK the canister is there - no plugged lines?
Look at the emission decal (if still there) to help ID Evap lines...

Do you have any issues refueling - nozzle kicks off often?
nope fuels up just fine, kinda the main reason why it this its the vent from the tank
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