1990 BMW 525i Intermittent Fuel Loss

BMW 525
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LISASHEP
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I have a 1990 525i. Intermittently while driving, there will be no fuel supply. I will come to a complete stop. Then after 30 seconds or so, will continue on. The engine does not shut off, but no matter how far down I press the accelerator, it will not go. The fuse at #23 is fine. Replaced the fuel pump (in trunk). Now will not crank at all. Double checked wires. Did it correctly. Is there a fuel pump relay/inertia???? that maybe I need to check? Thanks
Lisa
Mar 17, 2006 at 5:49 AM
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2CARPRO JACK
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  • 11,533 POSTS
something like that I would probably go towards the Mass Airflow Meter, when they have problems it can feel just like fuel delivery
Apr 6, 2006 at 9:57 AM
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Suggested Repair

Check the mass airflow meter. The expert noted that a failing MAF can feel like a fuel delivery problem during intermittent loss of acceleration.

Conversation Summary

The owner of a 1990 BMW 525i reported intermittent loss of acceleration while driving, as if fuel supply stopped, followed by recovery after about 30 seconds. The engine stayed running, fuse 23 was good, and the trunk-mounted fuel pump was replaced, after which the car would not crank. The owner asked about a fuel pump relay or inertia switch. The expert suggested checking the mass airflow meter because MAF problems can mimic fuel delivery issues.

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