scotty_82 Posted July 27, 2010 Report Share Posted July 27, 2010 Tried to start the lupo earlier and it wouldn't fire , so charged the battery and fitted new plugs and a derv filter. Now we have found the pump is not priming , 12v from the battery fires the stop into life but not the car , now is the pump on a relay , if so what colour so I can sort a new one out and get the thing working again. Any other ideas on possible faults causing this to happen would be cool too as i've checked most of then but might have missed one Quote Link to comment Share on other sites More sharing options...
Pete Posted July 27, 2010 Report Share Posted July 27, 2010 Is it cranking ok scotty, even attempting to try and fire up? I dunno about the relay, I wouldn't have thought it'd use one, as its not like it has to trip on and off is it, it starts on the key and stops with the key using a proper solenoid, right? Not too sure on vw dervs. Quote Link to comment Share on other sites More sharing options...
scotty_82 Posted July 27, 2010 Author Report Share Posted July 27, 2010 Yeah its cranking , plugs are glowing etc just the pump isn't firing over on the key , pump works if I give it twelve off the battery though Quote Link to comment Share on other sites More sharing options...
Pete Posted July 27, 2010 Report Share Posted July 27, 2010 What resistance has it got through it? Is it not getting the full 12v from its usual source then? Seeing as your having to bypass and go direct to battery? What voltage are you getting just cranking it normally? Quote Link to comment Share on other sites More sharing options...
scotty_82 Posted July 27, 2010 Author Report Share Posted July 27, 2010 A big fat zero volt at all times Quote Link to comment Share on other sites More sharing options...
Pete Posted July 27, 2010 Report Share Posted July 27, 2010 Do the diesels run off a rotary pump or are they common rail? Quote Link to comment Share on other sites More sharing options...
Pete Posted July 27, 2010 Report Share Posted July 27, 2010 Nothing at all, ok, sounds obvious I know but you checked for continuity down the line, make sure theres no resistance or owt? Quote Link to comment Share on other sites More sharing options...
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