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I found the problem with the fluctuation in my rpm. I went back and looked at some past posts and found one where the owner was having a problem with the primer pump being hard to pump. The result was that the regulator valve was in the wrong place in the system. I noticed that I had the same problem when trying the primer pump. So for grins and giggles, I checked and sure enough mine was wrong. I put the regulator on the return line to the tank and tried it. The tractor ran for 10 minutes without the rpm fluctuation. I do think I need to replace the fuel lines. That will be my next thing to do. Thanks for the help.
When I'm talking about full throttle, I'm refering to the 2000 rpm range. When you are talking about the lift pump, are you talking about the priming pump? If not then where is the lift pump? No fuel lines have been replaced as of yet.
Yes, the tank has been cleaned and treated. The pump was replaced due to lack of fuel and having to reprime the system. The tractor would start shuting down after 15 minutes of running at full throttle. Again, the replacement of the pump has fixted that problem.
Hey Bob,
Thanks for the information. It looks like the problem was not enough fuel coming from the tank to the sediment bowl. I managed to blow air into the fuel tank and freed the fuel flow up. While this helped for now, I will eventually need to pull the fuel tank for a good cleaning. Again thanks for the help.
Leland Hill
