1835b diesel

Sorry for the long post, but I want to be thorough. Thanks in advance for any advice/insights.

My loader was (is) running okay for a
couple minutes then bogs down,blows white smoke and dies. This all started a couple years ago. I read all about it and learned theres a part in the inj. pump that breaks down and clogs the return line, and this pump wont work if it cant get rid of excess fuel. So as a band-aid i took of the return check valve and it ran good for the next 9 months or so. I dont used it a ton, just for cleaning the drive and projecrsaround the yard.
Then last fall the band aid quit working. Will only run a couple minutes then dies.

Since then I've:
-Had the inj. pump rebuilt.
Replaced return lines and blew them out
-Reinstalled check valve
-replaced fuel filters
-and the diesel shop said the injectors were within specs.

Tonight i ran the return from the injectors and pump seperatley to a 2 liter bottle to watch what happened. Ran at full throttle for a couple minutes and the pump let off about 16oz. before it sputtered and died. Nothing came from the injectors.

Ive spent all this time chasing down the return, but that doesnt seem to be the problem. This is my first diesel, and i dont know where to look next. I'm out of ideas at this point. Any advice would be appreciated.

does it use a lift pump to get fuel to the injection pump?

no, it just goes from low on the tank, through a priming pump and straight to the filters.

It's one of two problems, not enough flow TO the injection pump, OR there's still a restriction in the return side back to the tank. Try loosening the two screw timing cover on the pump side, if engine runs fine WITH the fuel leak at the cover, but dies with the cover tight, return side is restricted somewhere. If it dies WITH the cover loose, you have a SUPPLY side problem. Also note, VERY LITTLE fuel will come from the injector return side if injectors are good..

I had the same problem on my 1845. it ended up being a partially plugged fuel line. it would run fine and all of a sudden it would lose power and die. if you had your pump rebuilt then it would seem you ae running out of fuel to it. when it happens check the filters and see if any fuel comes out. could also be your fuel tank cap. since that is basically gravity flow from the tank to the filters if there is no venting the pump wont be able to suck any fuel up. I would suggest that if you haven't drain your tanks. pull the fitting at the tank. that will give you a larger drain hole. flush it out real good. run a screw driver up into the tank to make sure theres nothing in the tank. check your rubber fuel lines if you have a real soft spot you could have a hose that is collapsing. good luck.

guys thanks for all you input. i think i got it runnin again. it ran for 10 minutes no issues. it is idling high, so ill have to look into that, but at least its running. i checked all the lines and they were flowing free, then i got the bright idea to check the FUEL LEVEL!!!
It was very low, i dont think it was below the connection to the tank, it must have been just enough that the suction from the pump couldnt cut it. I noticed the hand primer leaks when i pump it, so it might be losing some suction there, but i added 5 gallons and it seems to have made a big difference. hopefully this was really the reason and it keeps running. guess i shoulda spent 50 fixing the fuel gauge instead 800 on the pump. i never even thought about the fuel cause it had the almost exact symptoms of the plugged return. i guess i was just waiting for it to break again and didnt consider anythi ng else. oh well, lesson learned.