Another problem with M135??

[Brad]

checked each plug for spark and they all have spark. We cannot continue to keep tearing things apart, seeming to find and fix the problem, then it starts all over again. There has to be something causing this.
It has been suggested we buy a rebuilt carb? But I am reluctant to cough up The $400 on a guess? If I knew that would fix it, sure no problem. But to guess??
I sure could use some help, I'd hire a mechanic if I knew one.
We only have this truck to benefit veterans. We have missed Memorial Day due to it being down, and here comes the 4th of July.

 

[Barrman]

Out us all reading about your issues. You are the only one with hands on the truck. I am in no way trying to offend or belittle.

You started with a fuel issue. Then it was ignition. Exhaust issues too, but they should not have any bearing on how it actually runs. Now it is an unknown loss of power while driving. I think you have had your hands on the issue. There is only fuel, air and spark needed to make it run. All 3 have been covered.

My suggestion is follow the troubleshooting in the manual from the beginning and do every single test to completion it says to do in the order it says do it. Probably starting with a full tank of known good fuel and fully charged and load tested batteries.

The only other thing I can offer is fuel filters do sometimes have enough sediment in them to flow fuel until 10-15 minutes into running and then sometimes that sediment will block the filter. The in tank “sock” sometimes does that as well. Ignition coils also will test fine and then once surrounded by hot components start to fall off until the engine barely runs. My M35 Gasser had 2 coils do that to me over the years. Sitting on the side of a 100° road for an hour isn’t fun just to have it fire right up and run perfect again for about 10 minutes and then repeat.