1982 PORSCHE 928 NO START

  • Tiny
  • gearhead002
  • 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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Tuesday, September 18th, 2012 AT 3:25 PM

7 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

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?

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Tuesday, September 18th, 2012 AT 4:16 PM
  • Tiny
  • gearhead002
  • Member

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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Tuesday, September 18th, 2012 AT 4:29 PM
  • Tiny
  • KHLow2008
  • Expert
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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.

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Tuesday, September 18th, 2012 AT 5:56 PM
  • Tiny
  • gearhead002
  • Member

Even when power is applied to the fuel pump is still will not start it will just crank

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Tuesday, September 18th, 2012 AT 6:01 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

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?

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Tuesday, September 18th, 2012 AT 6:12 PM
  • Tiny
  • gearhead002
  • Member

Yes relay tested good and I'm not seeing any sparks

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Tuesday, September 18th, 2012 AT 6:31 PM
  • Tiny
  • KHLow2008
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  • 41,997 posts

Check the ignition coil and power supply to it.

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Tuesday, September 18th, 2012 AT 7:57 PM

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