Fuel pumps won't start

[caffeinatedsoap]

I've got an 86 325e with an m20b25 in it. The car has the dual fuel pump setup. I've replaced both fuel pumps the wiring harness for the engine and the ECU and the fuel pumps still won't start.

This all started after doing a head job. Whats going on?

[Killacortes]

Check your relays and your crank position sensor

[jlevie]

Make sure that the CPS and Cylinder ID connectors haven't been swapped. If they have the DME won't see timing data from the engine when it is cranking and won't run the pump.

[caffeinatedsoap]

Make sure that the CPS and Cylinder ID connectors haven't been swapped. If they have the DME won't see timing data from the engine when it is cranking and won't run the pump.

That could be it. Where are these connectors?

[caffeinatedsoap]

Check your relays and your crank position sensor

I have replaced the relays but not the crank position sensor. I will look up a test for it.

[ttrousdell]

That could be it. Where are these connectors?

Under the diagnostic port on the front of the engine. Doubt your problem is relays since all you did was a head job. Most likely you switched those connections during the install.

[caffeinatedsoap]

Under the diagnostic port on the front of the engine. Doubt your problem is relays since all you did was a head job. Most likely you switched those connections during the install.

Well I swapped those back and forth a few times to no avail. Anyone else have any ideas?

[Hey_You]

Did you check your fuse?

[jlevie]

Does the engine have spark when cranking? The DME won't provide spark if it isn't seeing timing data from the engine.