No Power to Fuel Pump

Mmmm - getting the silver Campaign together and I'm not getting any power to the fuel pump when cranking.  Consequently no start

Tried swapping fuel pump relay - same

Bridged connections where the relay goies and pump will buzz ok - so proves wiring to the pump and pump are OK

Ive got the dash out and all the switches are missing but I shouldnt need those should I?

Clocks are connected and working as far as I can see.

Any clues?  Was Ok before strip down.  What actually signals the relay to pump?  I guess there is some sort of pressure switch - where is that?

Cheers

Rich

Check the signal to the relay pin 31b from the negative coil feed. This is what stops the pump supplying fuel in case of an accident and ruptured fuel line.

Cheers
Rajan

I guess this is always live when ignition is on?

Take a wire from the battery to the pump to see if its a dodgy earth. I've had a few problems in that area in the past.

lahsa- earth must be Ok cos when I bridge the realy the pump works fine

This was the unreliable bit in my car…

Although my car was originally a 1300, I (and a friend who knew what he was doing) supplied a live to the relevant point in the fuse box, and added a relay and wiring to the relevant places which powered the pump fine. I had the car break down a couple of times though with the same problem you have now…Bridge the relay and it's fine, otherwise - no go!

In the end I added a stand alone switch and relay, as I did not want to get stranded again. All has been fine since then, though obviously, this is not a good fix for those who want their cars to be "Factory" like some of you guys do.

Good luck sorting it out!

It's must be something I've disconnected/dislodged as it was fine before the strip & paint - and yes battery was disconnected before any welding  

ops:  ops:

Connected the alarm immobiliser and now the fuel pump and ignition works  

Cheers rajan - your comment sent me checking voltage on 31b which was 2v and then 2v at the coil which led me to trace the looms and hey presto an plug with no alarm attached!

It's aaaaliiiiiive…..cackling laughter

It is often so obvious that you can overlook it!

Good stuff!

This sounds exactly the same problem i have got at the moment.
There is an immobiliser fitted, but i have no idea what to. When the immobiliser isn't deactivated the engine doen't even turn over, but when it's deactivated it turns over just with no spark or fuel?!
Please see here http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=12627