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Detroit Section Caretaker
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3,761 Posts
It's not a good idea.
The fuel flow helps cool the injection pump, and fresh cool fuel is what it needs.

On some other engines, like Detroit's, it is extremely important to have separate suction and return lines in the tank. As the injectors in the heads are cooled by the excess fuel flow, a gallon per minute at idle...

Grigg
 
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