Mechanics

NO START

1982 Porsche 928 • 104,000 miles

My 1982 Porsche 928 will crank but not start was running fine parked overnight the next day would not start. I checked the fuel pump and was not getting power to the pump I checked the fuses all were good I then bypassed the relay and still no power to the fuel pump. I then put power to the fuel pump and it engaged normaly but the car still will not start I still do not have power to the fuel pump I am getting fire and the commpression is good and have 3/4 tank of gas
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Gearhead002
September 18, 2012.




At the fuel pump relay, are you getting battery voltage at terminal 30?
Did you use a test light or DVOM to test the fuses?

KHLow2008
Sep 18, 2012.
Yes I'm getting power to the relay and out, but no power going to the fuel pump I traced the wire back up to the fuse panel and I'm not getting any power to the hot wire going to the fuel pump, I used a test light
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Tiny
Gearhead002
Sep 18, 2012.
That would mean you have a break in the wires from relay to fuel pump. You would have to check the connectors and wire for damage.

KHLow2008
Sep 18, 2012.
Even when power is applied to the fuel pump is still will not start it will just crank

Tiny
Gearhead002
Sep 18, 2012.
The relay also supplies power to other components and apart from the fuel pump, if a connector is loose somewhere, you would not be getting power to other components.

Have you checked for sparks?
Did you test the relay?

KHLow2008
Sep 18, 2012.
Yes relay tested good and I'm not seeing any sparks

Tiny
Gearhead002
Sep 18, 2012.
Check the ignition coil and power supply to it.

KHLow2008
Sep 18, 2012.

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