John Deere 450C

I have a JD 450C that will only operate for 15-20 minutes and then the rpms go up and down and is close to no power at all. The fuel filter was changed, and the injector pump was rebuilt. What lets the dozer operate for the short time before losing power? Thanks for any response!
Ken
 
Double check your fuel supply from the tank..a restriction will draw tight from suction,, then relax after it sets a bit.
 
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