Join Date: Jun 2004
Location: Austin, TX
Feedback Score: 0 reviews
re: 7.3L vacuum pump?
The thing that you describe is the vacuum pump and the vacuum reservoir. It's raining outside right now so I can't go and look to verify the other connections that you mention. First of all, make sure the pump works. Pull off the line to the reservoir and turn on the key, the pump should run continuously. If it doesn't the pump is fried. The best way to troubleshoot vacuum leaks is to have a Mity-Vac and gauge. Disconnect each connection downstream from the pump and pull a vacuum, watching the gauge. If it holds, go to the next connection. Leaks show up in the strangest places. My pulse vacuum solenoid (controller for the 4x4 ESOF) developed a leak within itself, caused the pump to run all the time and wear itself out prematurely.
Incidentally, the vacuum system controls A/C damper functions and front hubs, nothing else.
2008 F-250 CrewCab XLT, 4x4, short bed, 6.4L diesel, Leer camper shell. Smooth, quiet, great performance, poor mileage!
2000 F-250, PSD, CC, 4x4, XLT interior, short bed.(wrecked in Colorado, 11/2010)