BX2200 bogging down

[trailracer618]

I have two bx2200's with the same symptoms (one is actually the in-laws). Both run fine for about 15 minutes and then the motors starts bogging down like its going to die and then will rev back up after a while. We've tried new fuel filters. The next thing we are going to try is to drain out the fuel and get some new hoping maybe we just had a bad batch. I don't think its the fuel, but I guess it is worth a shot. Air filter looks good.

What are other possible problems?
Could it be the fuel pump?
Injectors?

[dusty-t]

Both tractors doing the same thing. I would bet on fuel too.

[trailracer618]

I bled the system last night (did not use new fuel) and it ran a million times better. Haven't done the in-laws tractor to see if it helps that one, but I'll get you posted.