[Vwdiesel] fuel pump tuning

[LBaird119 at aol.com]

there is a
hesitation when accelerating at partial accelerator.

  That's a strange one for a diesel.  The first thing I'd look for is loose 
or 
missing bolts on the injector pump mounting or the mount to engine.  
Most often it's a neglected-to-retighten rear pump bolt.  It's down 
under the injector lines and I've forgotten it several times.  Otherwise, 
possibly something gummy in the pump, from sitting.  It may clear up. 
Make sure there are no air bubbles coming through the (originally) clear 
line from the filter to the pump.
     Loren