AC HD-5 dozer again

I finally got this dozer running good after finding the fuel filter canister with a bunch of debris in the bottom. I ran the dozer for about 6 hours on two seperate days after cleaning the fuel filter canisters and changing the filters. Today when I was about to work it the dozer was hard to start and I had to crank it several times which is obnormal for this machine as she always started as soon as the starter was pressed. It did start and I traveled about about 100 yards when it started to throttle down and then die. It did start back up but wouldn't throttle up. It eventually would not start at all. I opened the fuel filter canisters and checked them and they were both free of debris. I then took the plug out at the top of the second stage fuel filter and there was little to no fuel coming from it. I suspect that the problem may be the fuel pump. Does this sound like the problem as looking at my service manual it appears that these are metal rotor or gear type pumps. Don't look like there's much to go wrong with them unless they just merely wear the metal off the rotor or gears. Can fuel pumps be purchased or a rebuild kit?
 

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