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Re: Help - Wiring Problem (archive)
[ Follow Ups ] [ 3-series (E30) Message Board ] [ Msg. Board FAQ ]
Posted by Leave it 2 bimmer on January 14, 2001 at 16:10:24:

In Reply to: Help - Wiring Problem posted by Matt on January 14, 2001 at 15:58:35:


Hi,
can anyone help me solve the following....
i have installed a complete wiring harness due to the
previous owner bridging terminals in fuse box to fix elec. prob1em but only caused about 3/4 of the loom to burn out.
anyway i managed to install the wiring loom (eventually)
and everything works ok apart from the fuel pump.
at first i suspected the relay so went on to check everything as follows...
relay (fitted new one just in case)
fuel pump ok
(bridged terminals 30 to 87b on the relay socket
and fuel pump ran)
i have managed to get the car running by taking a live 12+ on 2nd stage wire with in-line fuse from the ignition switch
to a switch on the dash and then soldered that directly
to term 87b on the relay and inserted relay. now the fuel
pump runs on 2nd stage ignition with the dash switch on,
the car starts and runs as normal,
can anyone help find out why there is no signal to tell
relay to switch on fuel pump when starting/running engine.
or can send me a wiring diagram,
also after replacing the wiring loom the Tachometer does not
work now any idea`s?
(UK)1983 E30 320i ( L-Jetronic )
any help would be very much appreciated
Thanks, Matt


My brother just had parts fixed off his computer because the tach was not working.So I think after that burn out you had,you may have some problems with the computer.The fuel pump only works when and after the car is in the starting position.not on ignition like some american cars.So I think this may have to do with the computer,since the only way to keep the pump running is if a signal is sent from your engine.this would have to be a moving signal,maybe the sensor on the damper,or from spark.who knows.but i think it may be a computer problem.In addition,there are some crash sensors around the car.these if triggered may also cut you fuel pump,so check those.and of course check the wire from that relay.if you still cant find the problem,then you might have to have it plugged in to a computer to see if there are any false messages recorded.


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