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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 06-09-2004, 01:12 PM   #1 (permalink)
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What do I need to look for when my fuel pump is going bad? I think mines going bad because sometimes when i floor it, the car hesitates, and abbout a a second later it speeds up fast. Does anyone know if that might be the fuel pump?
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Old 06-09-2004, 05:11 PM   #2 (permalink)
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It could be.... A way to check is to remove the return fuel line (after the pressure control at the fuel rail) and see if gas flows through the pressure unit. When gas flows back to the tank, the fuel pump isn't going bad. Be careful when doing this check because of the high flammable or explosive gas. Good luck!

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Old 06-09-2004, 06:24 PM   #3 (permalink)
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I think it's either the fuel pump, or the injectors. Hopefull nothing big
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Old 06-12-2004, 08:00 PM   #4 (permalink)
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i just had to replace mine, car ran great forever then it didnt want to start two times (i eventually got it going) then one day it crapped out on me. so if this happens to you, may want to check into it
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Old 06-12-2004, 08:10 PM   #5 (permalink)
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BMW fuel filters are designed @ euro gas specs(much cleaner than us) & if u r not using at least 91octane (US), u will probably go through them pretty quickly. this will also lead to premature destruction of your fuel pump.
if u havent changed if in a while (40,000miles) u might want to do it regardless.

be sure to buy good filters too! dont go to pepboys. turnermotorsports.com has them for a few bucks each made by MAHER, good stuff.
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Old 06-12-2004, 08:59 PM   #6 (permalink)
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There is so many other things it could be other than your fuel pump. Does you car have a hard time starting? If it does than I would check out the pump/filter. If not I would look else where for the problem.
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Old 06-14-2004, 11:41 PM   #7 (permalink)
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to me it sounds like the plugs or the worst it could be the ignition coils. check ur plugs .
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Old 06-15-2004, 01:58 AM   #8 (permalink)
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Just a suggestion. You might want to start with replacing your spark-plugs. To me that sounds like a spark-plug problem. Basic rule of thumb is if you are getting backfire from your engine (Intake) it is being fuel starved (lack of fuel maybe...fuel pump?). I would start with plugs because they can get hairline cracks that can arc within or just be bad this will cause hesitations at all speeds but more noticable at lower speeds during acceleration. I would start there or your likely to chase your tail. Plus it is cheaper! Let me know if it helps.
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