I have an MF20 that began to have trouble running. I would have to mash on the gas to (what should have been) too high a running RPM. It ran labored--this was over the course of cutting a football field with a flail mower to try to level it a little--for around 4 hours. I was running the mower really low down so it would take down grown over weeds--hard work. Only in first gear. A fair amount of black smoke and I had to go over several places multiple times because it was making the slip clutch burn. But I digress...
A couple times it would just peter out and quit running. Each time that happened, it was a really gradual process, almost like it was running out of gas, and I would pump the foot gas pedal with almost no effect. There was at least 1/2 a tank of gas at this point, cutting on a flat surface, so no sloshing.
Then, it would start again almost immediately and run a lot better, but still weaker than normal. It became weaker running and then I was just worried I wouldn't be able to get it parked in time. Each time I started it though, it started right up, only to run for 20 seconds and diesel to a stop.
I read several threads related to these symptoms and decided that I needed to replace the fuel transfer pump. I got one from this website and just replaced it this last weekend. The old one had a bunch of gunk in it and not sure how it pumped anything very well--lots of dirt/sludge/rust on the pump diaphragm. So I replaced it, bled the fuel system, and it does about the same thing....Starts, runs briefly, shuts off.
The only other thing I can find that seems related, is that the fuel pedal has a pin that's come out, so that it swivels freely without changing the throttle position. This is a tension pin i think. The hand adjustment seems to still move the throttle, though, so don't think the foot pedal pin would affect it.
Injection pump seems to be developing good pressure because it sprays fuel through the bleeder screws. Any thoughts would be greatly appreciated.
A couple times it would just peter out and quit running. Each time that happened, it was a really gradual process, almost like it was running out of gas, and I would pump the foot gas pedal with almost no effect. There was at least 1/2 a tank of gas at this point, cutting on a flat surface, so no sloshing.
Then, it would start again almost immediately and run a lot better, but still weaker than normal. It became weaker running and then I was just worried I wouldn't be able to get it parked in time. Each time I started it though, it started right up, only to run for 20 seconds and diesel to a stop.
I read several threads related to these symptoms and decided that I needed to replace the fuel transfer pump. I got one from this website and just replaced it this last weekend. The old one had a bunch of gunk in it and not sure how it pumped anything very well--lots of dirt/sludge/rust on the pump diaphragm. So I replaced it, bled the fuel system, and it does about the same thing....Starts, runs briefly, shuts off.
The only other thing I can find that seems related, is that the fuel pedal has a pin that's come out, so that it swivels freely without changing the throttle position. This is a tension pin i think. The hand adjustment seems to still move the throttle, though, so don't think the foot pedal pin would affect it.
Injection pump seems to be developing good pressure because it sprays fuel through the bleeder screws. Any thoughts would be greatly appreciated.