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Old 02-27-2003, 02:49 AM
irieite's Avatar
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Question Engine light comes on after fuel fill up..

My '91 190e 2.3 has had this problem since the day I got it. Every time I fill the gas tank all the way up, the check engine light comes on shortly afterwards and I have to reset it (battery disconnect). I bought a new gas cap from the dealer, but it made no difference. Any ideas??

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Old 02-27-2003, 08:59 AM
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My guess is that you are getting too much fuel in the tank and effecting the EVAP/ purge system.

Do you "top it off"? If so, Try filling it till the gas nozzle shuts itself off, ( thats WHY it shuts itself off, its FULL) and see if that corrects the problem.
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Old 02-27-2003, 11:43 AM
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Do you fill with the engine running? That may cause the light to come on.
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Old 02-28-2003, 02:06 AM
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Thanks for the replies. I have topped it off a couple of times. Mainly before a long trip. I'll try and avoid that from now on and see if it makes a difference. Does the "EVAP/purge system" tie into a sensor that could trigger the engine light?

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Old 02-28-2003, 02:08 AM
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Oh, and Yal, no I don't fuel it up with the engine running. Thanks

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Old 04-05-2003, 12:56 AM
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Inspector 1, I'm wondering ... Where does that extra fuel go?
I remember early 1970s GM cars had charcoal cannisters that would get saturated with fuel vapors. Can the extra vapors richen the mixture somehow and waste fuel?

I take it, that it's better to just fill up until the gas pump shuts itself off THE FIRST TIME when refueling? In other words, don't try to squeeze in another gallon or so.

I know in NJ (full serve only) they will top it off to the next higher dollar amount.

Tonight I filled my 300TE and got 19.5 mpg, not topping it off. I had been getting 17 mpg. I'll track this over several tankfuls to see if it's a statistical fluke. If my mileage improves, I'd rather pay $20 than $25 any day

Thanks, Bob
Bob Roe
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring
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Old 04-05-2003, 01:07 AM
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I tried filling up once just letting the pump auto shut off, but ended up with only 3/4 of a tank. I've also had it auto shut off near the beginning of a fill up on this car, so I guess I just don't trust the auto shut off at all times on this car. BTW, I'm in Tucson, AZ and the pumps don't have vapor recovery here, if that makes a difference.

Anyway, I've found that the fill up actually has nothing to do with the engine light coming on. What causes it to come on (after reseting it) is when I floor the accellerator and let it accellerate for a few seconds that way. It'll seem uneven, then the light will come on. It seems as if the car accellerates beter and smoother at 3/4 throttle.. I'm gonna post this in a separate post to see if anyone has an idea what might be wrong.

Thanks for the reply.

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