The vacum pumps do not fail all that often. What i would do is first is put truck in 4 wheel drive. pull vacum line at the front axle actuator and feel the 2 of them and see if you have any vacum there. If no vacum there, go to the top drivers side of transfer case and pull off the 4 line rubber connector and see if you any vacum there. If vacum is found there you have a bad vacum swith in transfer case. Just work your way up the system, they are very simple.
2001 2500 flat bed with dual 5" stacks, billet auto,P-pump, 191's, 4gsk, 0 plate garrett 3788R colt stage 2 cam, .084 lines 125 vp injectors at 280 bar
Last edited by dodgediesel59; 06-26-2007 at 06:17 PM.