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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-20-2004, 03:10 PM   #1 (permalink)
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Hi

I bought a BMW 318 1991 and the car stalled a day after 'cause of the fuel pump

I need to change it, I don't know a lot about BMWs but would it be wise to put in a fuel pump that isn't BMW? an aftermarket Mustang fuel pump in this case
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Old 09-20-2004, 04:14 PM   #2 (permalink)
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I've seen a page of some guy who did a turbo onto his m10 (granted you have an m42 no doubt...) and he used a Mustang in tank fuel pump to help with his engines fuel greed... @_@ So I think you could do it. I dunno, talk to more knowledgable people.
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Old 09-22-2004, 12:15 PM   #3 (permalink)
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I heard you can also use O2 sensers from a mustang?
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Old 09-24-2004, 03:52 PM   #4 (permalink)
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Thanks for the info

I'll keep that Mustang fuel pump in mind for the next time since I cheapened out and went for the rebuilt pump...

very disapointed...
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Old 09-24-2004, 08:55 PM   #5 (permalink)
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I don't think a Mustang pump would work right ghead
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Old 09-24-2004, 08:56 PM   #6 (permalink)
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i think it would let too much fuel in...its made for a much larger engine than the m42...i also have a 91 318is
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Old 11-04-2004, 05:19 PM   #7 (permalink)
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Originally posted by BMW Lover@Sep 24 2004, 07:56 PM
i think it would let too much fuel in...its made for a much larger engine than the m42...i also have a 91 318is
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Actually, a higher volume pump will not hurt it as long as it is a return style system; I have not learned enough about BMW's to know what type they use.

In a return style system (as used in EFI Mustangs up to 1998), the fuel is feed through the fuel rails to a regulator. As the fuel reaches the pressure set in the regulator, it blows by and is retured to the tank via a seperate fuel line where it is recycled to be used again. When using a higher volume pump, the pressure stays the same (due to the regulator). The only difference is that more fuel is cycled in a given time.

FWIW, a stock 5.0L regulator is rated at 88LPH and I am currently running a 255LPH pump.
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Old 12-06-2004, 08:52 AM   #8 (permalink)
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i do know that your fuel pump should have about 90 psi ...

post some pics too...
and dont use the flash becuase fire is bad for bimmers. :P
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