Hydraulic reservoir cap leak

[Matt Evans]

I was asking about this problem almost 2 years ago on my 88 90Q.  I was
getting the fountain of pentosin out of the resivoir.  At the time I got no
real good responses.

Since that time I've swapped pumps with another used one, no improvement.
I've had the hoses rebuilt by a hose shop - no improvement.  I finally
bought a pump reseal kit and rebuilt one of my pumps.  The pump shaft was
eccentrically worn, and the shaft seal was shot for sure.

Inspite of the obvious metal problems with my pump, the reseal kit has let
my PS system work better than it has in over a year.  Try rebuilding your
pump with the reseal kit.. Its $20 from a worldpac distributor.  If that
doesn't fix it, just get a known-good pump.