Check engine light ONLY after getting gas?
#1
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Year: 2001
Model: Cherokee
Engine: 4.0L
Check engine light ONLY after getting gas?
I'm getting a check engine light ONLY after filling the gas tank. When I read the code, I get:
P0455 (M) Evap Leak Monitor Large Leak Detected A large leak has been detected in the evaporative system.
The thing is, it ONLY comes on after filling the gas tank. I have a el-cheapo code reader and can reset it myself, so when it comes on I reset it. Until the tank is below 3/4, it will come back on. Once I've used 1/4 of a tank, it will not come back on until I get gas again.
I have replaced the gas cap with a brand new one from Autozone, but can't seem to figure out what else may be causing this. Any suggestions?
P0455 (M) Evap Leak Monitor Large Leak Detected A large leak has been detected in the evaporative system.
The thing is, it ONLY comes on after filling the gas tank. I have a el-cheapo code reader and can reset it myself, so when it comes on I reset it. Until the tank is below 3/4, it will come back on. Once I've used 1/4 of a tank, it will not come back on until I get gas again.
I have replaced the gas cap with a brand new one from Autozone, but can't seem to figure out what else may be causing this. Any suggestions?
#5
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Year: 1998,2001
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Engine: 4.0
x3 on the gas cap they're only a couple bucks or maybe you have a buddy with an xj that will let you try his. I would also check all the hoses to the gas tank I think there are 2 vacuum type hoses going to it. I think one is for vapors in the tank and one is a fuel return but don't quote me on that.
#6
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Year: 2000
Model: Cherokee
Engine: 4.0L I6
There is a number of things it could be. I'm tracking down the issue myself. I threw both a P0455 AND P0456 (large and small leak code respectively). Keep checking around the site and you'll find lots. I'm doing that now myself.
#7
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Year: 2001
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I forgot about this thread, lol.
The solution was simpler than buying or checking anything...
I just had to stop topping off the gas tank. Apparently I was over filling it and causing fuel to get into the evap system. *shrug*
Either way, my fix was to not top it off. When it clicks, shut it off.
I haven't had a light since.
The solution was simpler than buying or checking anything...
I just had to stop topping off the gas tank. Apparently I was over filling it and causing fuel to get into the evap system. *shrug*
Either way, my fix was to not top it off. When it clicks, shut it off.
I haven't had a light since.
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#9
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Year: 1999
Model: Cherokee
Engine: 4.0
Agree. Don't try to get the last 87 cents worth of gas in your tank. Bad habit and you gain literally ZERO benefits except an extra 4 miles before your next fill.
Doing that can create excess hydrocarbons which get picked up by the emissions system as it thinks you have a fuel leak.
When it clicks, SHUT IT OFF.
Doing that can create excess hydrocarbons which get picked up by the emissions system as it thinks you have a fuel leak.
When it clicks, SHUT IT OFF.
#10
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Year: 2000
Model: Cherokee
Engine: 4.0L I6
I know for myself it won't be any small issues like topping of the tank (which I just carry an extra 2gal can for that)or gas cap. I can't wait for warm weather.
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