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My truck is at the dealer now for the lift pump. He told me he doesn't think it's the lift pump cause they improved the design in 2001's. I had a hard time not laughing in his face considering half of you'll have proven otherwise. I asked him if he would run the guage on it and let me know what the numbers where. he said he would do that for me. We'll see. Looks like I better send Briar some money so I can have my own guage.
Cummins as of 5/13/02, $144. 95 for 3990105, $122. 00 for 3990106, that(the price difference) and I wanted the latest version, was the reason for my original post. The harness #4025182 is $7. 95. Thanks for the responses.
I get most of my Cummins parts from Harbor Diesel in Long beach, CA. But just about any big rig dealer is also a Cummins dealer. Cummins West is in West Sacramento. Also the F**d Truck dealers are Cummins dealers.