Just bought a used 03 envoy. When filling tank the pump always clicks off. I understand there was a fix put out for this but I am not sure if it was done. How could I visually verify the fix was done? New part installed or any other clues. If it has been done what else could be causing this I understand that whole system is to recover fuel vapes. Please help.
Filling up fuel always makes pump click off
- Thread starter Chasedw2
- Start date
Mooseman
Moderator
Interesting. I seem to think I saw some paperwork that the work was done. Maybe they kinked it installing.
from what i understand there are a few things that can cause this.. there are valves and that canister. doesnt help that gm knew it and did a t.b. on it. dont know if it was done on mine. its annoying as hell.
Mike534x
Member
- Apr 9, 2012
- 1,003
No point in cleaning it. the part is cheap that its better to just replace it. They are not serviceable units.
There's a Vapor Canister Vent Valve ( 25950499 ), this one mounts on the side of the gas tank. Usually thats the cause, and then there's a Vapor Canister (the pricier of the two) that mounts near/under the spare tire IIRC. The first one is usually the culprit if the filler neck isn't the problem. A clogged vent hose leading to these canisters can cause similar issues, if the charcoal pellets from either enter into those lines (if the material inside the canisters broke down over time) from the tank being over filled with gas, and trying to force more in after the pump cuts off. You could try replacing the Vent Valve, and disconnect the vent valve hose leading to the side of the tank and shoot some air through it to see if its blocked. Then connect them and see if it still shuts off at the pump.
There's a Vapor Canister Vent Valve ( 25950499 ), this one mounts on the side of the gas tank. Usually thats the cause, and then there's a Vapor Canister (the pricier of the two) that mounts near/under the spare tire IIRC. The first one is usually the culprit if the filler neck isn't the problem. A clogged vent hose leading to these canisters can cause similar issues, if the charcoal pellets from either enter into those lines (if the material inside the canisters broke down over time) from the tank being over filled with gas, and trying to force more in after the pump cuts off. You could try replacing the Vent Valve, and disconnect the vent valve hose leading to the side of the tank and shoot some air through it to see if its blocked. Then connect them and see if it still shuts off at the pump.
A kink can form in the rubber hose from the filler to the tank - near the metal tank fitting. I made a steel clip to spread the the hose open. Still, some pumps click off and others don't.
P0455 and gas tank gurgle
So, have been having issues with filling the tank, have to trickle gas to fill it, too much and it kicks off. Typical. Started by removing vent valve, observing that it wasn't blocked, blew dirt out of it with compressor and blew out the vent line with the gas cap off to prevent possible...
gmtnation.com
mine does this every 2 years or so. I replace the vent valve solenoid and the evap purge solenoid and the problem goes away. not horribly expensive nor hard to do, was aggrivating at first, but I treat it like routine maintenance.