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Posted by: dagdal1967 Jul 14 2003, 08:34 AM

Gentlemen,

Got in the car to start it yesterday and it would not start. We've managed to trace the problem down to the fact that the fuel pump is not getting any power.

Can anyone help us with troubleshooting what too look at next. We know that the power is switched through the Fuel Pump relay on the relay board, but dont really know what or how to check there.

Would really like to talk to someone ASAP as I only have limited hold over my brother/mechanic!

Anyone willing to speak real time would be greatly appreciated!

Thanks in advance!!

Doug

Posted by: John Jentz Jul 14 2003, 08:55 AM

Try Brad Anders site, http://members.rennlist.com/pbanders/ , there is a comprehensive D-Jet section containing flow charts to guide you.

John Jentz

Posted by: Bleyseng Jul 14 2003, 08:58 AM

Change the fuel pump relay with another one, they do go bad or the contacts get junked up preventing the flow of electricity.
Geoff

Posted by: URY914 Jul 14 2003, 09:03 AM

I've had to run a wire from the hot side of the coil directly to the pump. Then you'll if it the pump, or a relay, fuse etc. Try it but be careful you don't touch that hot wire to anything else.

Paul

Posted by: tod914 Jul 14 2003, 09:45 AM

If the fuse (not the relay), keeps blowing while your testing this, it could also be your AAR. They share the same fuse. You could disconnect the aar to check if indeed that is happening. dont ask me how i know

Posted by: dagdal1967 Jul 14 2003, 12:11 PM

PROBLEM SOLVED.

We managed to test the fuel pump and it was fine so we started tracking the wiring starting with the relay board.

Thank goodness for my workshop manual that had the full schematic! With a bit of trial and error and a bit of luck we managed to find out that one of the Fuel Pump Relays was bad.

I replaced it with the Hot Air Blower relay and It started like a charm.

I'll just have to get a replacement for the hot air blower and at least a spare.

Anyone know if you can get these anywhere outside of the obvious PP/AA? Do larger Auto parts stores or VW dealers carry them??

Thanks

Doug

Posted by: tod914 Jul 14 2003, 12:14 PM

Id buy them from porsche. That way you get a german made 1. Most of the other parts places sell ones made in china.

Posted by: seanery Jul 14 2003, 02:37 PM

Rich Bontempi has them at HPH.

I bought a couple when I was there.

www.highperformancehouse.com

Posted by: ein 6er Jul 14 2003, 03:02 PM

hey doug,

once, i had a fuel pump relay go bad on a 74 2.0. IIRC the pump stayed on with key off. at the time, (early 80s), i didn't know you could swap relays. so i opened the relay, there is a small breaker point that opens and closes for the pump. i had to put a toothpic between the points to shut off the pump. when i went somewhere i would pull the toothpic and start the car. when i got to where i was going i had put the pic back in!!

worked great until i could find another relay!!

doug waters

Posted by: dagdal1967 Jul 20 2003, 07:14 AM