I replaced the in tank fuel pump on my 1998 A4 2.5TDi avant quattro as it wasn't feeding fuel up to the filter. Now when false feeding the pump on the plug at the tank end I cant get the new pump to even throw some diesel out. Starting to think the old pump was OK as I could hear it running but no fuel was being sent up the pipe. Anyone know why it wont feed fuel? I have correct polarity on pump socket and plenty of diesel in the tank. John.