‘87 325is - Does your fuel pump make noise before you start the car?

[mach schnell]

In an ‘87 325is, with the early fuel pump system - does your fuel pump whine (as in, it’s working properly) when you turn the key almost all the way, before you start the car?

[digger]

mine with late single in tank did not run with igntion on (even for a short time), had to be cranking

[dnguyen1963]

I think the pump turns on for a brief 2 sec then off until you crank the engine.

[mach schnell]

Mine does not make any noise at all. And my car won’t start. So I am wondering if it’s the pump having failed.

[dnguyen1963]

Disconnect the fuel line going into the fuel rail. Put it into a container then start the car. If fuel is shooting out then your fuel pump is operational.

[digger]

jump it at the relay to see if it runs you will hear it. then you can check it runs when it is cranking as above.

[jbontke]

The fuel pump will not make noise or "prime" before the car starts. It only when when the engine is cranking or running. I have tested this and know I am correct.