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sundevil64 sundevil64 is online now
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Join Date: Apr 2009
Location: Cedar Park,TX
Posts: 2,706
fuel issue with 930

I have a 78 that will start and run for a bit then shut down. I am guessing it's fuel. I inspected and found a leak at the rear fuel pump. The used the wrong clamp (screw type), so I replaced it with an efi appropriate clamp. This time the motor started and ran. The fuel line between the accumulator and the rear fuel pump started ballooning, so I shut it down. A second later it blew. Fortunately the motor was not hot.

I did some reading in the 930 manual and it states the fuel pressure should be between 2-4 bar. If it is below 2 bar it's the front fuel pump. If it's over 4 bar then it's the rear. How does this work? They are both on separate circuits.

Is there something else I should check? prior to ordering a fuel pump?

I have another fuel pump from an efi carrera. Can I use this? The 930 fuel pump is pricey!


John- I blame and thank the longhood boys of Austin
84 911 Carrera w/ 930 t/p,efi'd,dizzy free,HFS turbo[/COLOR], 78 930 RoW no option sunroof coupe, 64 Corvette roadster, 71 911T, 73 911E, 67 Bronco survivor. 71 FJ40, 2001 Boxster
"Illegitimi non carborundum"

Last edited by sundevil64; 06-14-2011 at 01:16 PM..
Old 06-14-2011, 01:13 PM
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