TD55D stalling


New member

I have a NH TD55D which I have owned for about 20 years. Runs very well but now has a likely fuel supply issue.
The tractor was low on diesel then started to lose power. Refueled and restarted but it now stalls after a couple of minutes at all rev levels. I have checked and partly drained the fuel water separator and also the fuel filter and then primed to remove any air. Checked and cleaned air filter. I have ordered new filters for all of the above as they are overdue for replacement. Tractor starts slowly after about 3 x 10 seconds on the starter - feels like it is priming fuel - then stalls after about two minutes of what sounds normal running. I once had a hole in a fuel line that caused these issues but can’t find anything. Any thoughts on what else to check?


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Not sure what else you might check. New fuel filter and water separator are good moves. If that does not fix it I'm afraid you might have another leak in the fuel line somewhere. Wish I had a clue on how to pressurize the fuel line to check for a leak. I know it's possible but don't know how they do it.


New member
I may have found the issue. The bleed screw on top of the fuel filter does not tighten completely - little bubbles of diesel continue when I use the lift pump to bleed the air.

Either the screw or the fuel filter housing has a stripped thread. Hope it’s the screw.
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