| 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
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.