I have a 1980 SD that has not been producing much heat lately also. After reading Patsy's post this wekend I fiddled with the pump a little.

I connected the pump to the battery and heard it run. I thought - Oh well, there must be some other problem. I then proceded to adjust the throttle linkage. After adjusting I started the car and took it for a test drive.

As I was driving the car and putting the transmission through it's paces I noticed - HEAT! The connector must not have been making very good contact. When I disconnected, then reconnected it, contact must have been reestablished.

Oh by the way, the old girl drives nicer with the throttle linkage adjusted. Now all I need to do is get the idle speed slowed down a touch.

Doug

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1980 Mercedes 300 SD, 215,000miles
2001 F-350 Powerstroke turbodiesel, Crewcab, 4x4, 81,000 miles
1993 Chevy Suburban, 185,000 miles