cat 2u d8 fuel help

is there a way to check if pick up pump is working as it should.and can it be removed.if bad .does any one have pics.of this system.and how it works.

The transfer pump should make the gauge read in the green with the engine running, full flow fuel supply to it from the tank, clean filters, properly functioning pressure relief valve etc. One in really good shape will get out of the red with the pony motor turning the main engine.

They can be easily disassembled, inspected and feeler gauges used to check clearances, but frequently the trouble is elsewhere.

In your case, do the individual injection pumps have a little bleeder screw behind where the line to the injector screws on? It takes a special wrench or I think you can squeeze a 1/4" drive socket so it will fit over the bleeders. You can also just loosen the injector line at the top of the pump.

If you get fuel out of the pump bleeder, but not out of the injection line connection, most likely the plunger of that pump is stuck up in the pump. Take the side off the injection pump housing and look at the lifters. They should rise and fall as the cam lifts each one in turn. The rack should also move easily left and right twisting all the plungers to control the rate of fuel delivery.