1994 E36 M3 - Fuel Pump Relay Issues

Notices
 

Thread: 1994 E36 M3 - Fuel Pump Relay Issues

Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. 1994 E36 M3 - Fuel Pump Relay Issues 
    #1
    Bimmer Fan
    Car Details
    bitmonkey's Car Details
    Model of Car:
    E36 M3
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Cabriolet

    Join Date
    Aug 2009
    Location
    E.Sussex
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Hello everyone,

    I've lurked this forum a few times in the past, but this is my first post.

    I have an E36 M3 (the 3.0 made I belive from 1994-1995). The other day the car would not start, I've done some digging today and here's what I've found so far:

    Here's the view of my fuse and relay box from the front of the car:



    The DME relay as labelled has been tested and is OK, when 85 and 86 are energized 30 is continuous with both pin 87s - see below:




    There is no power at the fuel pump, and indeed none at fuse 18 (for the pump) so it must surely, if the DME relay is working, be the fuel pump relay. Therein lies the problem - I can't find it. The Bentley manual says the fuel pump relay is a 4 pin bosch like the orange relays labelled in the first picture. The bentley manual says the fuel pump relay is to the left of the DME relay as you look at the car from the side leaning over the fusebox, so in this picture:



    the dme relay is the white one and according to the manual the fuel pump relay should be below it in the picture, between the white one and the earth strap - instead, there are a pair of small half-size relays there like this:







    Here's another view over the side of the wing showing the DME relay arrowed and the two small relays to the left of it (there are also a pair of identical relays to the right of it)



    To make it clear - in the picture below there are 4 orange relays (labelled by white arrows) which are of the type the manual says is used for the fuel pump, I have tested all four of them and they are working fine, but I suspect they are for other things and have nothing to do with the fuel system.




    I can only presume the bentley manual is referring to a later model or something, since mine is clearly different.

    Assuming I know the DME relay works and that fuse 18 doesn't go live when the key is turned in the ignition I think I can safely say the next step in troubleshooting this is to find and test the fuel pump relay, but I can't find it, so has anyone any advice for me here, or hopefully someone has seen this type of fusebox before and already knows which relay it is?

    Thanks

    Paul
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Fanatic
    Car Details
    thegoodbadandugly's Car Details
    Model of Car:
    120d
    Year of Manufacture:
    2009
    Transmission Type:
    man
    Car Body Type:
    coupe

    Join Date
    Aug 2009
    Location
    uk
    Posts
    47
    Thanks
    0
    Thanked 8 Times in 7 Posts
    Just a quickie, has the car got an alarm system that may be cut into the fuel pump circuit to provide immobilization?
     
     

  4.  
    #3
    Bimmer Fan
    Car Details
    bitmonkey's Car Details
    Model of Car:
    E36 M3
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Cabriolet

    Join Date
    Aug 2009
    Location
    E.Sussex
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by thegoodbadandugly View Post
    Just a quickie, has the car got an alarm system that may be cut into the fuel pump circuit to provide immobilization?
    Hi,

    Thanks for replying. I recently had a guy I know remove the alarm for me as there was a problem with it, I do suspect this problem might have something to do with him, so the answer is no, there is no immobiliser on it, but he might have screwed up some wiring somewhere while he was removing the alarm.

    Paul
     
     

  5.  
    #4
    Dr of BMW gildersol's Avatar
    Join Date
    May 2008
    Location
    scotland
    Posts
    1,423
    Thanks
    171
    Thanked 428 Times in 356 Posts
    As far as I remember, the relay you've marked as being the fuel pump one is the correct one. You can short pins 30 and 87 in the base with a piece of wire to power the pump
     
     

  6.  
    #5
    Bimmer Fan
    Car Details
    bitmonkey's Car Details
    Model of Car:
    E36 M3
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Cabriolet

    Join Date
    Aug 2009
    Location
    E.Sussex
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by gildersol View Post
    As far as I remember, the relay you've marked as being the fuel pump one is the correct one. You can short pins 30 and 87 in the base with a piece of wire to power the pump
    Hi, the relay I've marked (with the yellow arrow and pink label) is actually two relays, each have pins 1, 2, 3 and 5.

    Is there any reason why there would be two relays rather than one?
     
     

  7.  
    #6
    Dr of BMW gildersol's Avatar
    Join Date
    May 2008
    Location
    scotland
    Posts
    1,423
    Thanks
    171
    Thanked 428 Times in 356 Posts
    Sorry, even though you posted really clearly, I still didn't read it properly. I've not seen that setup before. I'll have a look and see if I can find out.
     
     

  8.  
    #7
    BMW Guru
    Car Details
    Ronnie's Car Details
    Model of Car:
    See above
    Year of Manufacture:
    Never too old, never too new
    Transmission Type:
    Always manual
    Car Body Type:
    Usually 5 doors
    Ronnie's Avatar
    Join Date
    Dec 2007
    Location
    Bournemouth, Dorset.
    Posts
    20,393
    Thanks
    6,198
    Thanked 7,047 Times in 5,322 Posts
    Quote Originally Posted by bitmonkey View Post
    Hi, the relay I've marked (with the yellow arrow and pink label) is actually two relays, each have pins 1, 2, 3 and 5.

    Is there any reason why there would be two relays rather than one?
    I've never seen that before?

    Here's what is usually there, http://www.bimmerforums.co.uk/f17/19...ocation-t8555/
     
     

  9.  
    #8
    Dr of BMW gildersol's Avatar
    Join Date
    May 2008
    Location
    scotland
    Posts
    1,423
    Thanks
    171
    Thanked 428 Times in 356 Posts
    You could check with a multimeter, which relay coil terminal shows +12v when the DME relay is energised. The small relays coils are pins 1 & 2

    Or you could swap the small relays over to see if it helps.

    Could be worth checking that the DME itself hasn't got wet as this can cause similar problems.
     
     

  10.  
    #9
    Bimmer Fan
    Car Details
    bitmonkey's Car Details
    Model of Car:
    E36 M3
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Cabriolet

    Join Date
    Aug 2009
    Location
    E.Sussex
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by gildersol View Post
    You could check with a multimeter, which relay coil terminal shows +12v when the DME relay is energised. The small relays coils are pins 1 & 2

    Or you could swap the small relays over to see if it helps.

    Could be worth checking that the DME itself hasn't got wet as this can cause similar problems.


    Thanks, I will do this and then if that doesn't tell me what's going on I guess I'll have to get the top of the fusebox off and go spaghetti diving.

    Just my luck to have the only M3 in the world with this fusebox!!!!!!!!

    thanks
     
     

  11.  
    #10
    Dr of BMW gildersol's Avatar
    Join Date
    May 2008
    Location
    scotland
    Posts
    1,423
    Thanks
    171
    Thanked 428 Times in 356 Posts
    Quote Originally Posted by bitmonkey View Post
    Thanks, I will do this and then if that doesn't tell me what's going on I guess I'll have to get the top of the fusebox off and go spaghetti diving.
    If you do, the wire is red/white and goes from pin 87 on the DME relay to the coil of the fuel pump relay
     
     

Page 1 of 2 12 LastLast
Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts