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Thanks, I did find some info on the fuel filters on the engine and it is a return line coming off the inlet. There is an internal pressure valve that allows the excess fuel to return to the tank. Have everything cleaned up and working properly now. :-D

Won't the injector pump act as a pump to suck fuel from the tank? I'm thinking it might be doing this even thought the in-tank pump was not working. I've attached some photos of the configuration. I'm not sure how the 'T' fitting works on the on-engine filters as it is right off the inlet to the...

Thanks for the reply DaveP. I was thinking there sould be a return line, but was confused as to why it would come off the inlet of the fuel filter. I'm not too savy on the diesel injection and am learning.

This is a bit lengthy, if anyone knows where to find a service manuel on the fuel system and can direct me to it, that'd be great. I just aquired a 1967 Kaiser Jeep M51A2 Dump Truck, multi-fuel turbo. I was told to leave the transfer fuel pump switch on when driving. This didn't sound right so I...