on a hunch ,i know that our cars use a ccp system (carbon canistor). Ok, well i tried a vented gas cap tonight and noticed that the car acceklerated a little smoother but felt less torquey. I then put back my locking gas cap and immediately felt myself being pushed back in my seat with the torque i am familiar with. Strange. Anyone else exp. this? For the record, when i took off the vented cap i had no pressure release like i do with my regular cap. Maybe that pressure is good.

Anyone??

No one experiences high pressure when they remove their gas cap? Havent any of you tried a vented cap because of this? any results?

guess not, i actually never heard of these, how much is the average cost so i can try one? my cap is pretty old and about itme for a new one.

I bought my locking gas cap at Walmart, its a Stant. I got the factory cap and drilled two small holes in it for testing purposes.

aaww i see, yea. whitch would you reccommend for me? i like speed and lots of it,

lol, its a stant locking cap,it was like $8

Check the gas tank vent. It's on a piece of hose & hangs from the hose.

There is a discussion on it, but I don't recall the thread title, or exact location.

Seems easy to get to IIRC.

doesn't the gas tank vent into the charcoal canaster under the hood?i know its supposed to be under a vacumn to keep the gas fumes from leaking into the air.

Fumes go to canister and are stored there.
Are purged to the engine under programmed conditions

If line to canister is blocked or system not being purged then common to get pressure build up in tank as noted

yes,but someone else told me its normal to get pressure

i was curious on how a vented cap would change performance and i did feel a difference. yes, i had no pressure when i went to remove gas cap,but car performed differently,just didnt feel as powerful

i want to learn why?

Try an actual vented cap, not a reg cap with holes in it.

I'm about to order mine from mdm it's like 10 bux

My pressure is gone in the tank after I fixed my tank pressure valve