I dug into it today since it was nice outside and here's what I found:

It actually DOES have high and low pressure switches, just like an automotive type system. However, I don't think that's the problem in this case. I pulled the capacitor (it was very to locate and identify) and it was slightly swollen, leaking a clear oil from around the terminals.

I'm ordering a new one and we'll see how that does.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250