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Fuel pump relay?????????
Posted: Sat Apr 30, 2005 11:45 am
by golf_killa
Anyone any idea which relay in the fuse box is the one for the fuel pump, non of the are named and theres no diagrams in the bmw book or the good old Haynes(or not so good in this case!) how stupid
its an 89 318i lux, if that helps
Posted: Sat Apr 30, 2005 12:05 pm
by E30Mark
The fuel pump relay is not in the fuse box!
On the 4 cylinder models its mounted on the bulkhead beneath a black plastic cover that runs behind the cylinder head. Just next to the diagnostic socket on your car. Beneath the cover are 2 relays, i can't remember which is which though. one will be white the other orange. They are for the ECU & Fuel pump, some one will be along here soon to tell you which one is the fuel pump relay.
Posted: Sat Apr 30, 2005 12:10 pm
by golf_killa
cheers ill have a look for that now
Posted: Sat Apr 30, 2005 12:22 pm
by golf_killa
yeah ive found an orange and a white one, ive rung up 2 bmw specialists one said its the white and one said its the orange
? can anyone shed any light
Posted: Sat Apr 30, 2005 12:54 pm
by Treeman612
hi - Bentley manual shows a pic. for 4 cyl engines with three relays - small one nearest front is fuel pump, big one in middle is vacuum advance relay, third one, (big) nearest bulkhead is idle speed stabilisation relay. Six cylinder relays are (front to back) 1) Main relay, 2) Fuel pump relay, 3) Oxygen sensor heater relay.
Hope this helps
Posted: Sat Apr 30, 2005 1:45 pm
by E30Adam
They aren't always in the same order.
Have a look at the wires that go to the relays. The main DME relay will be the one with a fatter wire than the rest (I think it's red). The fuel pump relay will be the other one.
Posted: Sat Apr 30, 2005 1:52 pm
by Brianmoooore
Main ECU relay is white, fuel pump relay is orange. To double check, one of the wires to the fuel pump relay is green/purple.
Note that power to the fuel pump relay is fed from the main relay.
Posted: Sat Apr 30, 2005 4:36 pm
by amit325i
if you do suspect a relay, while the engine running, give the relay a tap with a screw driver head, and see what happens.
I kept having intermitent stalling, happening once or twice a day,
a changed a few things as you do, i tapped the relay and low and behold it stalled, changed it, and bobs your uncle.