LMTV loosing prime after sitting ??

My LMTV will loose prime after sitting overnight, Cant find anything in the TMs.
Replaced separator and filter.
Anyone else had this issue ?

Air leaks between filter and tank? Filter sealed well? Drain seated properly? Try talc powder to look for seeping diesel. When I cleaned my fuel system out I heard a check valve/flapper in the tank. Have you tried blowing compressed air down the draw fitting to blow out debris and clear it incase it's leaking there?

Hope you get it. The small stuff is the most annoying. I need to figure out a different battery mod so I don't have to buy those expensive batteries. A reliably starting truck is a necessity.

mine did this too, turns out it was leaking air in the water fuel separator, the rubber diaphragm went south on the hand pump, I was told they all pretty much do it in time, replace the water fuel separator and all is good now

Seth

Brand new engine? Or the cleanest engine compartment in the world...? You could eat off that compressor.

Adventure Driven said:

mine did this too, turns out it was leaking air in the water fuel separator, the rubber diaphragm went south on the hand pump, I was told they all pretty much do it in time, replace the water fuel separator and all is good now

Seth

Click to expand...

Do you mean the rubber flapper in the hand pump housing where the filter screws in?

There is no flapper/foot valve in the tank…

Lines dry rot especially the one from tank to primer housing.