> If I drive for more than about 20 to 25 minutes at a stretch, my van
> starts to lose power, almost like it's overheating.

Kyle,

Welcome!  I have an '85 Westfalia as well.  It might be for sale soon.
Are you sure you don't want it instead? ;-)

I'd check everything, to include fuel filter, temp sensor and temp sensor
connections.  Do the LED lights for temperature blink when you first turn
on the ignition?

Chris S.
'85 Wolfsburg Westy "Camel"
http://www.knology.net/~vw/dadada.jpg