AC-7040 - No throttle response

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   Needing some advice..  Think I may have an injection pump problem?  Tractor will start and idle at ~1000 rpm.  Constant or extremely slow throttle, might get 1300 rpm sometimes.  Engine sounds normal firing all 6 but no power, lifting the wings on a bat-wing mower will lug or stop the engine.  I have replaced the fuel filter, rebuilt the primer and blown out the fuel line back to the tank.  The throttle moves the pump linkage fore and aft to the stops on the pump.  Tractor sat in shed without being started for almost 5 months this spring/summer due to my medical issues, was running fine before. 
Thank you for any insight!

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dualquads Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 12 Dec 2010 Location: Ill Annoy Points: 53	Post Options Post Reply Quote dualquads Report Post Thanks(0) Quote Reply Topic: AC-7040 - No throttle response Posted: 8 hours 25 minutes ago at 8:24am
	Needing some advice.. Think I may have an injection pump problem? Tractor will start and idle at ~1000 rpm. Constant or extremely slow throttle, might get 1300 rpm sometimes. Engine sounds normal firing all 6 but no power, lifting the wings on a bat-wing mower will lug or stop the engine. I have replaced the fuel filter, rebuilt the primer and blown out the fuel line back to the tank. The throttle moves the pump linkage fore and aft to the stops on the pump. Tractor sat in shed without being started for almost 5 months this spring/summer due to my medical issues, was running fine before. Thank you for any insight!

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injpumpEd Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 13 Sep 2009 Location: Walnut IL Points: 5124	Post Options Post Reply Quote injpumpEd Report Post Thanks(0) Quote Reply Posted: 8 hours 14 minutes ago at 8:35am
	Metering valve in pump is probably sticking. Take top cover off and timing window off side to drain fuel down, and spray brakleen around the metering valve. If it's sticking, it will not respond to any loads. It may be due for proper servicing if it's really nasty inside. When they get gummed up, they can have the transfer pump regulating piston also stick, causing the pressure to spike and it results in a seized head and rotor assembly. Then becomes a very expensive repair lol!
	210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!