1982 Porsche 928 no start

Tiny
GEARHEAD002
  • MEMBER
  • 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
Tuesday, September 18th, 2012 AT 3:25 PM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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?
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 4:16 PM
Tiny
GEARHEAD002
  • MEMBER
  • 4 POSTS
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
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 4:29 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 5:56 PM
Tiny
GEARHEAD002
  • MEMBER
  • 4 POSTS
Even when power is applied to the fuel pump is still will not start it will just crank
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 6:01 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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?
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 6:12 PM
Tiny
GEARHEAD002
  • MEMBER
  • 4 POSTS
Yes relay tested good and I'm not seeing any sparks
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 6:31 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the ignition coil and power supply to it.
Was this
answer
helpful?
Yes
No
Tuesday, September 18th, 2012 AT 7:57 PM

Please login or register to post a reply.

Sponsored links