Early 350i fuel pump relay position
Discussion
Hi All,
My early 350i (1984) doesn’t start. It’s not getting fuel to the rail. Putting a voltmeter on the fuel pump shows 0.3v once ignition is on. When cranking it stays at 0.3v. I understand I should see 8v.
A quick check shows that I have a good earth at the pump. The wiring looks good otherwise. I’ve pushed the flap on the airflow meter too and no change.
So, I think it’s probably the relay. Now I need to identify which relay it is.
Searching this forum tells me that the layouts changed. I have found a diagram with same layout as mine but it has two fuel pump control relays shown. Why two relays? Is that correct?
Here is a blurry pic of my car:-
Which relay should I investigate? I want to bridge the terminals first to see if that powers up the pump…..
Thanks,
Mark
My early 350i (1984) doesn’t start. It’s not getting fuel to the rail. Putting a voltmeter on the fuel pump shows 0.3v once ignition is on. When cranking it stays at 0.3v. I understand I should see 8v.
A quick check shows that I have a good earth at the pump. The wiring looks good otherwise. I’ve pushed the flap on the airflow meter too and no change.
So, I think it’s probably the relay. Now I need to identify which relay it is.
Searching this forum tells me that the layouts changed. I have found a diagram with same layout as mine but it has two fuel pump control relays shown. Why two relays? Is that correct?
Here is a blurry pic of my car:-
Which relay should I investigate? I want to bridge the terminals first to see if that powers up the pump…..
Thanks,
Mark
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