FIXED.Sorry its taken so long to respond. we removed all the injectors and they were all full of water. it seems like the garage the customer filled up in sold him lots of water. The problem we had was that customer had drained the tank before he towed it in to us. he had spiked the wires going to fuel pump/tank unit and damaged them.we cleaned everything out the best we could and customer managed to locate 5 second hand ones which we fitted and van started straight away.Has been along all job.Thanks for all the advice. Paul