1988 Testarossa

First, check the fuel pump connections in the y white connector for problems -- see post #9 in this thread:

http://www.ferrarichat.com/forum/showthread.php?t=255009

 

Hi, I had similar problems when rebuilding my car that had sat for 7 yrs. I assumed the pumps were fine, when actually the pumps needed replaced because they had frozen up. I also flushed gas tanks, as any debris that gets to the pump might seize it.

 

There's no other connectors between the y connector and the fuel pumps.

You mentioned putting +12V on terminal 87 in the relay socket as a test, but that terminal is not connected to the fuel pump (on a late US TR). My suggestion would be:

1. try the same test, but jumpering the +12V battery terminal onto terminal 30 in the fuel pump relay socket; if the corresponding fuel pump doesn't run,

2. Apply the jumper from the +12V battery terminal to the large P (beige) wire and then to the large PN (beige/black) wire in the y connector, if the fuel pumps still don't run, either the pumps are dead or you have a break in the wiring.

Good Hunting!

 

And hopefully you are looking for a new box in the meantime..

 

Thanks for the feedback Rachid, but can you give more information about the failure please -- was the break down by the horizontal white connectors and caused by overheating (a problem that we've seen before), or was the break just randomly out in the middle of the PWB somewhere (something that hasn't been reported before), or something else?

 

Yes, PWB = Printed Wiring Board = Printed Circuit Board

 

But was the "bad area" near the white connectors (and obviously damaged by heat), or somewhere else and just a break with no heat damage?

 

That is very odd.. Glad you found your issue..

R

 

Thanks for the feedback. We've learned to never say never when talking about what could go wrong , but, as R said, your failure type hasn't been reported here before AFAIK.