1982 porsche 928 no start

1982 PORSCHE 928
104,000 MILES
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GEARHEAD002
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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
Sep 18, 2012 at 3:25 PM
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KHLOW2008
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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?
Sep 18, 2012 at 4:16 PM
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GEARHEAD002
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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
Sep 18, 2012 at 4:29 PM
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KHLOW2008
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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.
Sep 18, 2012 at 5:56 PM
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GEARHEAD002
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Even when power is applied to the fuel pump is still will not start it will just crank
Sep 18, 2012 at 6:01 PM
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KHLOW2008
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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?
Sep 18, 2012 at 6:12 PM
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GEARHEAD002
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Yes relay tested good and I'm not seeing any sparks
Sep 18, 2012 at 6:31 PM
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KHLOW2008
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Check the ignition coil and power supply to it.
Sep 18, 2012 at 7:57 PM
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