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John Deere 410 Injector Pump

Richard Roland, Sr. 80's Backhoe sat for a year, went to start it, and it would not start. I replaced the lift pump, fuel filter (bowl had a lot of junk in it). Turned it over, and no start. Bled it at the IP inlet, and now have lots of fuel coming to it compared to a trickle before. Was going to bleed the injectors, but no fuel at all coming from them when constant cranking engine.

The IP is a Stanadyne, model JDB431MD2800. I have read other places to replace the "check valve" which is located in the return to fuel tank line. How can that possibly be the problem if it is in the return line? I am just an OLD dumb cowboy here, and this has me stumped.

Can anyone help me out here? Pleassssse !!

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