I had a similar leak on my '90 GL, about 3 quarts in three days of back
and forth to work. The whole rear of the van was covered, with oil
dripping off the lower edge of the rear hatch. It was the oil pressure
sender behind the water pump  pully. I removed the pulley and used a
24mm deep socket. There is an adapter piece that came off with the
sender, at first I thought that I had got the wrong sender. There is a
large copper washer/seal ring behind the adapter as well as the seal
ring behind the sender. My 24mm deep socket was too long to use with my
1/2 drive ratchet. The rear sheet metal interferred with the ratchet.
I ended up using a 1/2" drive breaker bar at an angle to get it most of
the way snug and then tightened with a 15/16 deep socket that had a
hole sideways through it. I've since bought a 15/16 3/8 drive deep
socket that is shorter and should work OK ( Chraftsman # 43328). Get
the correct sender, there are different ones.
Dave

------
Dave Hally
1974 R90/6
1977 R100/7
1951 HD Servicar
1990 Vanagon GL
Zayante, California

--- Zoltan <zolo@FOXINTERNET.NET> wrote:

> Hi guys,
> I found a major oil leak somewhere in the back of the engine, but not
> the main seal.  I can't see where it is.  What am I to expect?  Right
> now, I'm spraying Breaklean all over there about.  It is just too
> crowded there with the engine support, oil pressure switch, coolant
> pipe, intercooler, etc.
> Anyone had any experience like this?
> The car is loosing a quart in twenty miles.
> Zoltan
>