5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
wanted to see, well my rpm's have been jumping a lil, making my car run shitty. i narrowed it down to my fuel line(im guessing thats why my check engine light has come on) but yeah, so i wanted to see how i can know what part of the fuel system is having the problem? if it is the fuel filter(gonna start with the most inexpensive) how would i know if that is the problem? if i take that out will it be obvious? with my fuel line: is it easy to follow? or does it go through places that it is hard to get to? i haven't seen leaks or anything, but fuel evaporates fast..so its kinda hard. i dont wanna buy one of those pressure checkers because thats about as much as it is for me to get a new fuel line. just lemme know on way to spots this problem please, so i can get my baby back out on the streets.
there are several possibilities that could be causing your problem but I doubt with all certainty that your fuel line is causing the problem unless it is kinked. I am therefore assuming that you mean in general that there is a fuel delivery problem.
You might have a vacuum leak, faulty MAF, weak fuel pump, DME on the verge of puking, idle air control valve malfunction, valves out of adjustment ...etc
A dirty fuel filter could have an effect but most likely would cause a consistent poor running behavior or a severe bog upon heavy load. If you have high mileage without ever having replaced the fuel filter, I would recommend it anyway. What have you done so far to diagnose the car?
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found it out! i smelled the fuel from in the engine compartment so that narrowed it down, it was actually the rubber fuel line going from the T-bar to my fuel rail, so i replaced that and its allll better now, thanks!!
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