Does the E32 740 not have a fuel pump relay?

[DSMjrv]

i have searched all over and found the location of the relay for the 750 and 735. i checked the fuse and its fine.... im looking through this and i cant find it

http://www.e32-schrauber.de/bmw/s-relaisbelegung.htm

what is an unloader?

also i had the 1222 code from the stomp test, its gone now

now i have the 1212 code which is the secondary O2 sensor, could this cause the engine to not run, or fuel pump to not turn on?

i have the fuel line connecting to the fuel rail pulled, and when i crank the motor over nothing comes out of it...

its a 93 not sure of the month

[E32FAN]

pg 1362-04 at http://www.e38.org/e32/e32_93_etm.pdf shows M2 Fuel Pump, driven from K6301 Fuel Pump Relay.

It needs K6300 Engine Module Control Relay on pg 1362-00 to be energized (Arrow B becomes arrow G on pg 01.)

Both of these relays are in the E-Box, with the DME.

Unloader Relay is K3 shown on pg 0670-08. Its function is to offload F15 and F18 current from the Acc-Run-Start ignition key switch. See the O arrow on pg 0670-00.

[DSMjrv]

thanks for pointing me in the right direction

i just want to jump it to make sure its the pump that needs replacing

that being said its kinda hard to tell which of the three relays is for the fuel pump there is a blue, white, and orange one...

[E32FAN]

Yes, the 740 documentation has several missing diagrams. Perhaps it was rushed.

You can look down and see which of the relay sockets has thick RED and GRN/VIO wires to it, plus thin RED/WHT and BRN/GRN wires.

But the easiest way to test-run the fuel pump might be to jumper briefly to Fuse 23 from 12V (at the charging post, say). Diagram is on pg 1362-04.

[robwor]

I know this is a bit old but by chance did you figure out which relay it was I'm soooooo lost

[robwor]

I know this is a bit old but by chance did you figure out which relay it was I'm soooooo lost

[shogun]

The Bentley repair manual has on page 610-6 under electrical components the e-box diagram
There are 3 relays shown for 735 and 740, from outside/fender right side to middle of engine bay: oxygen sensor heater relay (not used on all models)>>>fuel pump relay in the middle>>>>main DME relay
Here in one pic of an 735 it is shown, the yellow relay = fuel pump relay http://bmwe32.masscom.net/johan/elec...s/modules.html
This is for 735 and 750 http://www.autogenius.info/bmw-735i-...e-box-diagram/
this is for all years, download it http://shark.armchair.mb.ca/~dave/BMW/e32/

To test the fuel pump on my 750 I do not use the ignition switch/key, I use a jumper cable, just for 1-2 seconds one end on the B+ pole and the other end onto the fuse 23 for one bank and for the other bank onto fuse 24. Then you can here the fuel pump running.