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Join Date: Apr 2009
Posts: 58
79 930 fuel pump reality check

If I understand the various posts, the front fuel pump should make a whurring sound when the key is turned to the position before the starter cranks like my 71 911 E with Weber conversion.
Am i correct in my assumption?
Or, does it run only after the starter is energized? If this is the case, how does one hear if it is running or not?
My reason for all this is that I have a no start situation as of a couple hours ago after a 40 mile run yesterday. Has often been a hard starter after driving for awhile but never a cold start problem.
My game plan is to clean the fuse and relay contacts. If nothing happens, I have a new relay to try. After that if nothing happens I,m not sure which direction to take.

79 930
71 E with Weber conversion
63 356 S-90
Old 08-16-2010, 06:26 PM
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Forced Induction Junkie
WERK I's Avatar
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,298
The fuel pump(s) activate when the metering plate senses vacuum and deflects as a result of the engine turning over. The fuel distributor/metering plate has a switch internally that activates as a result of the metering plate moving on its fulcrum.

Disconnect the green plug on the top-backside of fuel distributor, turn the ignition to 'on' should then hear the fuel pumps running. Avoid pushing on the metering plate with the ignition on This causes raw fuel to be dumped into the intake runners via the injectors.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P

Last edited by WERK I; 08-16-2010 at 06:39 PM..
Old 08-16-2010, 06:35 PM
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