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> Help! After Every Fill-up Cel Code P0304, 2004 Accent - auto. - 100K miles
273HYPO
post Aug 31 2008, 10:21 AM
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2004 Accent - auto. - 100K miles
Ok fellas, some you have seen my posts dealing with my CEL for code P0304. I thought I had it solved but now it comes on after every fuel fill-up. Its happened at least 5 times or more. I know what the code means (ign. misfire #4 cyl.).
I read and checked what affects the code but this one has me baffled. I thought at first it is the evap. canister but the car takes a fuel fill-up without any trouble and it is not hard to pump it all in and does not give me the code. If I put a bottle of STP gas treatment in the tank it clears the code after about 40 miles drivieng but it doesn't explain why it sets off the CEL on every fill-up. I also thought I may have sediment in the tank and the fill-up is stirring it up but I have filled her up and various capacities. Also, several weeks ago I got the CEL code P0441 for the purge control valve. I replaced it, cleared the CEL and it never came back on. Fuel filter has never been replaced because it is built into the fuel pump assembly.
Overall drinvability and MPG's are not effect. Any thoughts fellas....
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273HYPO
post Sep 5 2008, 08:16 PM
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Anyone wanna try and guess? CEL goes out around 2/3 of a tank of fuel.
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LilBean
post Sep 6 2008, 10:36 AM
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The fuel filter IS replaceable, even though it is in the tank. It's not "built into" the fuel pump, but you do have to do some disassembly to get to it.

It sounds as if you may have bad gas or sediment. I'd change the filter and maybe start using a different gas station.
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273HYPO
post Sep 6 2008, 06:27 PM
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I've ruled out the bad gas since my wife uses different gas stations and it has happened several times. And I would think that the CEL would stay on and not go off if the fuel filter is clogged. When the tropical storm HANNA settles down I'll look at the fuel filter for a replacement. Thx...Anyone else?
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congo_90
post Sep 9 2008, 07:12 PM
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i may not be 100% mechanical minded but if its saying "ignition mis-fire" have you checked your distributor, plugs and points? sounds kinda simple but it could just be the problem.. Does this fault affect driving? also, How did you first discover it? Last suggestion is a fuse has blown on the fuel delivery circruit / Bad ECU
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