Fill up and the jeep dies wont idel.

[joshgoble]

Ok I have been trying to figure out what valve or evap system malfunction Im having. 04 3.7 liberty if you leave the vehicle running. And top it off with gas it kills the engine makes it hard tostart and won't idel till the fule leavel lowers .Any one able to point me in the right direction?

 

[LibertyTC]

Keep in mind this is a pressurized system.
If you leave it running then open the gas cap, you are asking for a trouble code.
Do you have an engine light on?

 

[joshgoble]

Only telling me the cats are bad and needs to be replaced.

 

[derekj]

I would take a look at the purge valve - I see lots of them when they fail they fail open and will suck fuel in from the gas tank when it is full. And that causes drivability issues as now it is running rich.

 

[joshgoble]

I was assuming it was something of that nature and I'm sure your right because it is definitely getting fule when it dies or floods out more like it. Because it's when fule is in the filler neck. Is when the issue was noticeable i had just made sure not to top it off. .That and the fact it was parked 7 or 8 years didn't help things like vaccum valves and hoses. Thanks for the info. Is the valve serviceable or just a throw a way part lik most things theses days?

 

[derekj]

I was assuming it was something of that nature and I'm sure your right because it is definitely getting fule when it dies or floods out more like it. Because it's when fule is in the filler neck. Is when the issue was noticeable i had just made sure not to top it off. .That and the fact it was parked 7 or 8 years didn't help things like vaccum valves and hoses. Thanks for the info. Is the valve serviceable or just a throw a way part lik most things theses days?

Ya - the valve is not serviceable - a good quick check is to unplug the electrical connector and then with the truck running see if you have vacuum on the outlet of the valve that goes to the gas tank. Should be no vacuum there.

 

[joshgoble]

Ya - the valve is not serviceable - a good quick check is to unplug the electrical connector and then with the truck running see if you have vacuum on the outlet of the valve that goes to the gas tank. Should be no vacuum there.

OK I'll check that out after I get the dash back together. I had the pleasure of changing out the heater core today. But at this point it almost has to be the purge valve. Because it's only when it is full and you turn a corner or you over fill it that it occurs and there isn't a code for it. Thasks for the information. It will definitely make life easier having a starting point.

 

[joshgoble]

Ya - the valve is not serviceable - a good quick check is to unplug the electrical connector and then with the truck running see if you have vacuum on the outlet of the valve that goes to the gas tank. Should be no vacuum there.

Well with it unplugged there is no vacuum. I guess the valve is good. And Im back to square one.