325ix M20 Fuel Pump

[boogle2]

I'm unsure if the behavior of my car is appropriate. When I turn the key to the "on" position without starting, I can hear the fuel pump quite loudly, and it stays on for as long as the key is in the 'on' position. My question is:

1: is it normal for the pump to be loud enough to be heard?
2. should the pump run always, or should it turn on for a few seconds and then off?

I just did a fuel pressure test last night and got 43psi at idle and 49 psi with the FPR disconnected.

[dnguyen1963]

I'm unsure if the behavior of my car is appropriate. When I turn the key to the "on" position without starting, I can hear the fuel pump quite loudly, and it stays on for as long as the key is in the 'on' position. My question is:

1: is it normal for the pump to be loud enough to be heard?
2. should the pump run always, or should it turn on for a few seconds and then off?

I just did a fuel pressure test last night and got 43psi at idle and 49 psi with the FPR disconnected.

When you turn the key to "on", the fuel pump should run for only a few seconds. No, the pump should be quiet. If you can hear it loudly then it is on its way out.

[boogle2]

When you turn the key to "on", the fuel pump should run for only a few seconds. No, the pump should be quiet. If you can hear it loudly then it is on its way out.

Thanks for the reply. Any idea what would cause the pump to stay on? Could it be a grounding issue?

[jlevie]

On an E30, the pump should only run when the DME sees timing data from a rotating engine. Sounds like someone has done some "creative" mods to the fuel pump wiring.

As dnguyen1963 said, The pump should be quiet.