Finally got the engine back in my car after reparing the cracked head and now it won't start. Engine cranks over fine, but I don't seem to have any fuel pressure. As i remember, when the ignition is switched on you normally here the fuel pump run to pressurize the system. My fuel pump is not coming on. I disconnected a fuel line and found no gas. Then I jumpered the connections for the fuel pump at the tank and the pump runs. Used this to pressureize the system, but it still is not coming on when the ignition is switched on or the egnine is cranked. No power at the pump connections.

any suggestions?

 

Fuse?

 

Try renntech and rennlist forums too. I know it has to be driving you nuts, might as well expose the question to the masses.

 

Posted the question on all three forums. The first thing I did was check the fuse, and it is OK. Could be the relay, but I don't have a replacement handy. The system worked before I dropped the engine. I am going to purge the air out of the system by disconnecting the return line at the pump. I can get it to run by jumpering it.

Does anyone know if the pump runs whenever the ignition is on? does it sense the pressure in the fuel ines somehow?

Very frustrating to finally have the engine back in and it won't start.

 

Pump will run up to pressure when ignition is turned on.

 

Seem to have fuel in the lines although I can’t hear the pump running. I did purge the air out of the system.

Ran my Durametric and came up with some fault codes as follows:

• Motronic
  • PO336 Porsche fault code 10 Engine Speed Sensor

Open

• Alarm
  • 48 Airbag signal acknowledged

Status not Present
Frequency counter 11

Locks not reached
Status not Present
Frequency counter 9

Status not Present
Frequency counter 2

Status not present
Frequency counter 1

Status not Present
Frequency counter 5

Status Present
Frequency counter 127

I am wondering if either the Motronic fault or the Alarm fault for the 21 W Lead (DME Immobilizer could be keeping the engine from starting. Any Ideas?

 

relays? ground?

 

It was the pulse sendor for the flywheel. Somehow it had gone bad and the engine will not run without a signal from this sendor.

 

Nice find... where's the youtube video of it running?!

A