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D-360

C

Cyrus T

New User
Hi, my D-360 engine with an American Bosch doesn’t react the way it used to when given throttle. The engine starts but not as it normally does, no vibrations it runs smooth but it doesn’t respond as it should when I push the throttle. It started to leak from the leak off (fuel return goes both to tank and pump).
I then tried to blow air back from to tank to see if the fuel could go back but I couldn’t.
Should it be that hard for the leak off fuel to return to tank? I guess the pump hasn’t gone bad over a week off sitting in a barn.
When bleeding the fuel comes strongly.
Fred.
 
If the return line is clogged, fix that first and see if it helps.

Pumps CAN go bad overnight. Something on the verge of breaking when you shut down the night before snaps when you go to start up the next morning.
 
Is it a valve or something that makes it hard to blow from leak off to the tank or is it just clogged?
 
The only check valve in the return would be in the elbow where the return leaves the pump. This check valve was changed to just an orfice some where in the 86 series tractors. Any pump being repaired that check valve fitting is always replaced with the later style orfice. So, it depends on where you are blowing from. You stated from the tank. I would take the line off at the pump and blow back to tank. I would also take that fitting out of pump. Those check valves have been known to come apart and enter the pump. Sometimes the piece lodges under the control sleeve and you have a runaway engine. Like rods coming out side of block. Have seen it.
 
I tried to blow from the leak off hose back to the tank but I failed with my lungs, it took compressed air to get any through back to the tank.
 
If the return line goes to the top of the tank it should have no restriction. If the return line enters the bottom of the tank there most likely is a check valve which you most likely can not blow through. Take the fuel cap off to make sure the vents are not plugged.
 
It´s fitted in an Farmall 826 and the leak off goes to the under side of the tank.
Thanks for all replies.
 
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