220 Fuel Delivery Problem

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   Had to remove the injector pump to replace a torn umbrella seal. (Crankcase had gallons of diesel in the oil.)  We literally removed the pump, changed the seals, and reassembled everything.   After reassembled everything we started tractor and it will run for 20-30 seconds (sometimes longer if the rpms are lower) and then acts like it is starving for fuel.  We have checked the line from the tank all the way to the injector pump and everything is flowing good.  I'm baffled.  We've cracked the lines loose at each injector and made sure there was a good flow multiple times.  One observation is the injectors whose lines go to the top side of the pump seem to flow less than the ones that attach at the bottom of the pump which got me to wondering if there might be air stuck in the pump.   We fought this for over 4 hours yesterday opening lines.  I'm at my wits end with this thing.
Tractor ran fine before we had to removed the pump due to gallons of diesel fuel in the crankcase oil.

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Dana(Iowa) Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 22 Aug 2010 Location: Central Iowa Points: 52	Post Options Post Reply Quote Dana(Iowa) Report Post Thanks(0) Quote Reply Topic: 220 Fuel Delivery Problem Posted: 31 May 2021 at 12:04pm
	Had to remove the injector pump to replace a torn umbrella seal. (Crankcase had gallons of diesel in the oil.) We literally removed the pump, changed the seals, and reassembled everything. After reassembled everything we started tractor and it will run for 20-30 seconds (sometimes longer if the rpms are lower) and then acts like it is starving for fuel. We have checked the line from the tank all the way to the injector pump and everything is flowing good. I'm baffled. We've cracked the lines loose at each injector and made sure there was a good flow multiple times. One observation is the injectors whose lines go to the top side of the pump seem to flow less than the ones that attach at the bottom of the pump which got me to wondering if there might be air stuck in the pump. We fought this for over 4 hours yesterday opening lines. I'm at my wits end with this thing. Tractor ran fine before we had to removed the pump due to gallons of diesel fuel in the crankcase oil.
	1957 D-14 with loader 1947 Model C (restored) 1947 Model C (unrestored) SOLD! 1972 220

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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: 5094	Post Options Post Reply Quote injpumpEd Report Post Thanks(0) Quote Reply Posted: 31 May 2021 at 12:47pm
	What has happened is the flex ring has broken down and the pieces plugged the return, and the high housing pressure blew the driveshaft seal. With the return being bled off into the crankcase, it will seem to run right. Open up the return and it will run for a while to get the task at hand done. You will need to figure on a pump rebuild in the near future. The seal doesn't roll over just because. This is very common.
	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!