1990 E30 325 suspected fuel relay problems help needed please (FIXED)

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  1. 1990 E30 325 suspected fuel relay problems help needed please (FIXED) 
    #1
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    paul85's Car Details
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    Hi i'm posting this on behalf of my dad
    he has as stated above an e30 325
    he's just had the car returned from a local body shop after being painted the car was running when we dropped it off but now its home again it wont start
    we've sigled it out that is not getting fuel through so we
    checked all fuses (ok)
    so we got the haynes manuel out and bridged the fuel relay it fires first time but wont tick over (but it has had the battery off for quite a while and i know bmw's can be tempremental like that)
    weve put a new relay in and it is back to square one wont fire again and the haynes doesnt go into any more detail as to what it could be
    so any help or advice would be greatly appreciated
    thanks paul
     
     

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    With the new relay in, is there power to the fuel pump under the rear seat?
     
     

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    i'm unsure bud as the cars not here i'll get my dad to check asap
     
     

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    Just get him to check if the fuel pump runs when the ignition is switched on. You should be able to hear it prime for a second. IIRC its under the rear seat on the drivers side...
     
     

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    he said theres nothing live around the fuel pump unless the relay is bridged
     
     

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    What I think you are doing is bridging the relay control from the Motronic Control Unit. Have you definitely checked fuse no. 11?
     
     

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    checked every fuse insight bud
     
     

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    just a question is there an inertia switch on these cars ? i have one myself but dont know if i have 1 either but its worth a check
     
     

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    So fuse 11 is ok and there is 12v getting to the pump when you bridge out pins 30 and 87 on the relay, and you've fitted a new relay.
    Check for +12v at pin 86 on the relay base with the ignition on. If there's no voltage it may be a faulty main relay Can you hear/feel the main relay click when you turn on the ignition?
    Last edited by gildersol; 27-05-2009 at 18:20. Reason: spelling
     
     

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    #10
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    hi everyone thanks for all your help so far
    we've had an auto sparky out to the car today and he seemed to think the ecu was at fault so we removed it to find one of the pins was bent double and squashed against an adjacent pin so we assume that when the car was getting welded they have removed the ecu and upon replacement used a hammer
    we have since straightend the pin out put it all back together and it still doesnt run unless we supply the fuel relay with an earth the sparky left saying the ecu was at fault because it isnt supplying the relays with an earth and reccommended we get another ecu to try but that to me seems an expensive/hard to get part just to try do you guys have any idea s
    thanks paul
     
     

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