fuel pump Question - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 07-12-2004, 09:16 PM
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I am posting this for my dad, he recently purchased an 88 325 (no letter designation?) he has driven the car off and on for a couple weeks but over the weekend the car just stopped starting. ghead The car will turn over and has spark but there is no fuel being delivered. After running a test light around the engine compartment, he discovered there is no power coming into the fuel pump. The car has had electrical problems with its previous owner having the battery replaced at a chain store and the tech fried the fusable link by putting the battery in backwards. This problem was fixed and the previous owner put another 5K or so on the car. The question is, is there a roll over switch or something similar that may have been tripped that killed power to the fuel pump and therefore stopped fuel delivery?
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#2 (permalink) Old 07-14-2004, 02:18 PM
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OK no replies so I tried to get a little more info from the old man on what all he has checked out. The power problem seems to be different than what I had described. After the car wouldnt start he began testing the fuses in the engine compartment and discovered that there is no power on either side of the fuse that operators the fuel pump.

Does anyone have a wiring diagram or know where we can find a wiring diagram so that we can track down the culprit of this power loss?

And based on information from another site can anyone tell me how to locate the following on the car: DME Main & Fuel pump Relays.
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#3 (permalink) Old 07-14-2004, 04:18 PM
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You should definitely invest in a Bentley Manual for the E30 - it's got detailed electrical wiring diagrams and good descriptions, pictures, diagnostic tests, etc. It costs ~$40, but if you're trying to do anything yourself, it's a must. Dont' get a Chilton or other brand...they're not as comprehensive.

I've done a bunch of work on my E30...some of it having to do with the fuel pumps (there are 2, an in-tank pump, and a main fuel pump). All the relays are in the relay box on teh driver's side under the hood...or just outside of the relay box.

Get the Bentley - it will answer 90% of your questions.
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#4 (permalink) Old 07-17-2004, 03:47 AM
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I would definitely check the relays, that's most likely the problem... The car wasn't jerky while driving it though was it? Because my fuel pump went out a while ago and before my car completely died, i would lose power for a few seconds and then it would just come back on, which made a not so nice ride... so ask your dad about that.

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