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Dave 86 930 Fl Dave 86 930 Fl is offline
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Join Date: Dec 2005
Location: 1000 Islands NY
Posts: 405
Differential Diagnosis

Guys,

A little more information. I measured voltage and amperage for both fuel pumps. The manual states voltage should be ~ 11.5 and amperage should be in the range of 5-8 amps. I measure the voltage at the pump, whereas I measured the amperage at the relay. Here are the results:

Front FP: 11.1 volts & 7 amps

Rear FP: 10.6 volts & 6 amps

Because I suspect the rear pump has issues, I could look at the results and say they're a bit low. I ordered some special fittings today from Porsche ($50) that will allow me to test the fuel pressure with the CIS tester, so we'll see where that leads me. I should have the parts Friday or Monday, as they are being shipped from our friends in Germany.

If you have any other thoughts or comments, please feel free.

Regards, Dave
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1986 930 - K27-7200, Andial Intercooler, Tial Wastegate, Electronic Boost Controller, B&B headers, Bodart Zork, Leask Adjustable WUR, Full Elephant Racing Suspension w/Adustable Spring Plates and Von Shocks, Wevo Transmission Mounts, Fuel Safe Fuel Cell, Forgelines (9"/11"), Hargett Shifter, Innovate AFR, Cobra CF Seats, DAS Rollbar, Coleman Floating Rotors, Lightweight Interior, Forgeline 17" x 9"/11", 2800 lbs.
Old 02-24-2009, 12:35 PM
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