1996 BMW 328 fuel delivery

328IS

MEMBER
1996 BMW 328

Electrical problem
1996 BMW 328 6 cyl Two Wheel Drive Manual 100k miles

my fuel pump only runs when power is applied directly from the battery. The relay is operating correctly. Although the pump runs with the battery powering it and the fuel is pressurized at the fuel rail the car will still not start. I have good compression and good spark. Shouldn't the vehicle still be able to fire if I have power to the pump?

3 Replies

DOCHAGERTY

MECHANIC
9,601 POSTS

The item you have overlooked is if the fuel injectors are actually injecting fuel, check for an injector signal and let us know.

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Saturday, July 5th, 2008 AT 7:42 PM

328IS

MEMBER
2 POSTS

How do I go about checking for an injector signal? I don't think I have one, so what would my next step be after confirming this?

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Wednesday, July 9th, 2008 AT 9:38 AM

DOCHAGERTY

MECHANIC
9,601 POSTS

If there is spark then a bit of carb cleaner sprayed into the intake will get the engine started. The fuel injector signal or lack there of, can be determined by removing the electrical connectors at the injectors and installing a small light bulb called a "noid" light and watch to see if it lights up indicating fuel being injected. It is possible the computer that controls spark and fuel is faulty. I recommend seeking out a local BMW shop for the diagnostics.

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Wednesday, July 9th, 2008 AT 8:26 PM