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


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
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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