Quote:
Originally Posted by Califred944
On my 944 87na the mpg dropped off to 20 and had long crank to start. Turned out to be the Fuel Pressure Regulator was bad.
Took a nut from a fuel rail, drilled and taped with 1/8 pipe threads and installed a fuel pressure gauge at the front of the fuel rail. 28psi when running but dropped to 0 when engine was turned off. Should stay at 14psi for 20 minutes. Replaced the FPR and all is fine. Mileage is back above 20 and starts right away.
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So, the FPR CAN affect fuel mileage? The PO of my car mentioned "it might need new fuel pressure regulators" and that was about the only advice he had. Not sure why he used a plural either, thought there is only one. The car has been running really well after all the time and parts I've put into it, but maybe a new FPR could make a difference?