255 leaking fuel @ pump

Keith Molden

Well-known Member
While I was using my 255 Massey Saturday I noticed fuel dripping from the rear of the injector pump. I couldn't tell where exactly it was comming from. I'm thinking we replaced the copper washers on the lines last year sometime so I don't think it's comming from one of the lines. It kinda looks like it's comming from the bottom rear, kinda in between where 2 of the lines attach to the pump where there is what looks like a bolt but I didn't have time to look at it much as I had to come back up here to work. I know that's a pretty poor description but does anyone have any ideas. Keith
 
I would suspect the copper washers first. Some of the replacement ones are harder than the originals and don't seal as well.
 
Hey Keith! I just had the pump worked over at a diesel shop on a 255 with the 203D. There is a skinny O ring at the rear of the punp, have to tear it apart to get to it, might as well replace them all while you are there. There is a guy here, "Dieseltech" that has some good info. I blame low sulfur diesel but it was 36 years old at the time so it was going to leak eventually. I replaced some washers first but the problem continued. Good luck with it!
 
Would that be where what looks kinda like a cup (that has the injector lines connected to it) goes into the rear of the pump housing? Kinda my thought that there is an o ring in there that is leaking. Bet you gotta pull the pump & tear it apart to replace the o ring. As you can tell, I'm at work & don't have the manual up here with me. LOL Keith
 
Yep, that's it. I am not certain but I think it requires a serious tear-down. While you're in there may as well replace all the other stuff :-(
 
Best way to find fuel leaks, I use a blow gun to dry pump assembly, and a good shop light to see where leak is. I can reseal your complete pump if needed. If you like call five seven four, eight nine three four one seven two after 7 PM IN time. Be glad to help.
 

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