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Old 01-17-2004, 01:42 AM   #1
WV_guy
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2004 WRB WRX Wagon
cobb stg 2.5

Default Overfilling gas tank

I popped a "service engine soon light" in my truck (2000 siververado). I went to autozone to get it pulled. The guy didn't give me the code, but he explained it to me, as, "Let's say you go to the gas station and gas is cheap that day, so when the pump turns off, you keep filling the tank. It over fills and cannot vent...." He lost me there. All I said was, "guilty as charged" I thought it was odd because the light only came on when I was down to 3/4 tank. He also said it could be a bad gas cap. When I restarted it the light came on, but in less than a minute went off, and hasn't been back.

I know I'm not supposed to overfill the tank in my WRX, and I don't. But what if you do? Could you throw a CEL? What was he talking about with the tank venting? or a bad gas cap? Anyone see this in our cars?

BTW: great service at autozone. Five minues in and out with CEL gone.

Bob
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Old 01-17-2004, 02:45 AM   #2
kami333
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Never seen that happen. I've been greedy a few times and overshot a bit, had a few drops drip but have never seen a CEL from it. Maybe it's different in a NA
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Old 01-17-2004, 03:59 AM   #3
esteve
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A "service engine soon" and a "check engine" light aren't the same thing. You have to reset the memory on those once in a while because they have a computer that determines when an oil change is due.

BTW, if you're interested I've got a 4 volume set of factory repair manuals for the 2000 Silverado I'm trying to get rid of.
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Old 01-18-2004, 12:35 AM   #4
WV_guy
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not to turn this into a silverado thread, but yeah I know about the oil change light. I can reset the service engine soon light the same as the change oil (accesories and pump accelerator) ?

Not right now, but I'll keep you in mind about the service manuals
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Old 01-18-2004, 08:00 PM   #5
esteve
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Silly me, I thought you were referring to the change oil soon light.

The SES light does have to be reset with a scan tool. If it goes on, the manual says to check the emissions control system, so yeah, by overfilling you probably got some raw fuel into the charcoal canister or plugged the line. It's only meant to store gas vapors.
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Old 02-02-2004, 09:27 PM   #6
vrg3
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You probably had the EVAP system CEL that usually comes on if you fail to tighten your gas cap all the way.

My guess is you overfilled it, and then when things got warmer the air and fuel in the tank expanded to the point that some pushed past the cap and the pressures got all weird. The ECU was monitoring them and finally decided they were abnormal when it threw the CEL.
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Old 02-08-2004, 04:03 PM   #7
italy wrx
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I worked on a 2003 camry last week that overfilled the gas tank. It costed the customer $1000.00 to fix all the damage. The problem with overfilling is that there is a check valve on obd2 vehicles that is suppossed to vent fumes out of the tank while you are filing the tank into the evap canister. When you overfill, the check valve gets damaged,allowing fuel to be directly pulled from the tank into the intake when the canister purge vsv is turn on by the vehicles computer. It take a while, but the evap canister slowly fills with liquid fuel which in turn crawls up the hoses to the vsv which in turn is pumped directly into your intake causeing extra fuel to be intoduced to the motor. This can get so bad the car will only run for 30 seconds then die.
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Old 02-08-2004, 09:33 PM   #8
WV_guy
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I got the SES again. Again I was on about half a tank when it happened, and in 2 fill ups I have not overfilled. I never had symptoms like you are describing Italy, it has always started right up, there has been no noticable difference in how it runs, and has never died. I haven't pulled the code yet, so I'm not 100% sure of what it is.
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