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Volts at Fuel pump 931

 
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Porsche_912_931  



Joined: 25 Aug 2017
Posts: 2
Location: Denver
PostPosted: Sun Nov 13, 2022 6:38 am    Post subject: Volts at Fuel pump 931 Reply with quote
Afternoon group.

We have got the 931 started but for only a minute or so. Appears to not be getting fuel to injectors. Cracked the lines at the filter No fuel. Last night I had my son turn over the car while I checked the volts at the pumps. They appear to only be putting out 6v when cranking. Shouldn’t this be 12v?

The car did start and we did test injectors in car on the last time we worked on it. Any suggestions?

Relay?

Thank you.
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924RACR  



Joined: 29 Jul 2001
Posts: 8815
Location: Royal Oak, MI, USA
PostPosted: Sun Nov 13, 2022 11:02 pm    Post subject: Reply with quote
Yeah, that's definitely not enough.

Two things to help simplify your diagnosis. Jump the fuel pump relay; that way you won't have to crank to check voltage, and you can isolate poor power supply to the pump vs. voltage draw-down while cranking. Secondly, try checking voltage with the terminal removed from the pump...

Obvious starting point is, of course, clean all your grounds. Pump ground is on the body between the taillights, under the carpet...
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