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03-25-2011
My check engine light and Check Gas Cap warning came on last week. Diagnostic said it was a 'Gross Leak' in the evap system. The gas cap looks fine. How much should I expect to pay for a fix on this and what are the consequences of not fixing it right away?
03-25-2011
EVAP canisters (at least for the GP or my Cobalt) were less than 40 bucks...and you just unhook the old one and toss the new one on and clear the code.
03-25-2011
My 06' GXP also has a 'Large Leak' in the evap system. Smoked the tank, it didn't leak. opened and closed the valve with the tech2 and it seemed to funtion properly. Closed the valve and ran the car while watching the tank pressure on tech2, it didn't come off 0. Pressure sensor was the culprit. Looks similar to a MAP sensor. It's not an item you can order separately from the pump. Kinda like the in tank fuel filter.. f*ckers
03-29-2011
This seems like a common problem as I'm having the same exact issue..
Fcuking GXP's.
04-11-2011
ive got the same code too, car had a quick fill cap on it, put a normal cap and was fine for a day or 2, taking it to the dealer on wednesday, i just got the car too.. not happy
05-13-2011
same problem here
05-13-2011
ACDELCO Part # 16238399 fuel tank pressure sensor
06-30-2011
if it is a P0446 most likely its the vent valve if you do any gravel driving. Its behind the left rear tire inside the rear bumper cover
07-19-2011
Is anyone experiencing the strong odor of gas inside the cabin after a fill up?
07-20-2011
That sounds like an exhaust leak moreso EVAP IMO.Originally Posted by TML529
08-07-2011
I'm throwing PO455 code, which sounds similiar to this situation. At first it was a small leak and I replaced the gas cap and it went away for about a week. It came back as a Large Leak. Not sure what the fix is. Thanks
08-08-2011
the parts guy at the local chevy dealership suggested changing the evap cannister. i changed it psoblem solved.
08-08-2011
will do. Thanks a lot.
08-08-2011
I have a 97 grand prix 3.8 That build a whole lot of pressure in the fuel tank speacially on hot days. I replaced the, fuel cap. evap silanoid, evap valve, canister. When I open the gas cap I still get a lot of pressure blowing out of the tank.
06-11-2012
When taking off the evap canister how do you remove the big vacuum hose? I tried pulling and twisting and it doesn't want to budge. I'm afraid of breaking it. Do I need to get rough with it or what?
06-13-2012
as i recall it had a spring hose clamp.
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