Warrantee it!
Bigstick: if the only 'bomb' you have on your truck is the gauges, by all means warrantee the lift pump! If you have to remove a lot of 'bombs', then it may not be worth the $150 for the pump from a Cummins dealer.
9psi at idle is low, and it probably is a lot less under load or at WOT. Get it fixed, or you may have some damage to your injection pump.
There is a LOT of heat removed from the VP44 injection pump and returned to the tank. This heat may be an additional factor in the damage caused by the lift pump failures.
A fellow TDR member had to remove his fuel tank at my shop, and drive his truck to get some repairs done on it. He jury-rigged a five gallon can and fuel lines to have a temporary fuel tank. The fuel was HOT, over 105*F [measured] after a few miles of driving. Outside air temps in the 60's.
These VP44 pumps need the volume and pressure of the lift pump to lubricate and cool them.
I hope you don't have any issues with your dealer.
Greg L