2CarPros - Car Questions & Answers

1982 Porsche 928 Repair Question


Topics covered: Fuel pump, Fuse, No power.
Mileage: 104,000 miles.

Asked on September 18, 2012

1982 porsche 928 no start

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
Avatar Asked by gearhead002

Answer

Replied on 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?

Tiny Answered by KHLow2008 (expert)
39,900 answers provided
Replied on September 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

Tiny Response from gearhead002
1 question asked
Replied on September 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.

Tiny Answered by KHLow2008 (expert)
39,900 answers provided

Replied on September 18, 2012

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

Tiny Response from gearhead002
1 question asked
Replied on September 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?

Tiny Answered by KHLow2008 (expert)
39,900 answers provided
Replied on September 18, 2012

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

Tiny Response from gearhead002
1 question asked

Replied on September 18, 2012

Check the ignition coil and power supply to it.

Tiny Answered by KHLow2008 (expert)
39,900 answers provided