The rack controls the amount of fuel the engine gets, it defaults to wide open when the engine gets shut off. Now if its stuck you cant force the rack because it will break.
If the rack is stuck then you will need to flush out each injector and carefully work the plunger up and down on top of the injector. Once the plunger is free the fuel rod on the injector will move freely.
Dont over torque the fuel lines either, they can crack! Detroit fuel systems are simple, this is all pretty easy to do. As it was mentioned, Bus grease monkey on YouTube has videos on this and will probably make more sense seeing it than reading it
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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