Thread: fuel Manifold
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Old 09-28-2015, 11:11 AM   #32
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The fuel returned to the tank is for cooling the injection pump. All that compressing of fuel to inject it creates lots of heat. To stop the fuel boiling and cavitating lots of fuel is run through the system and returned to the tank. The return circuit is almost more important than the supply circuit, unless your tanks are not fore and aft but side to side, then "usually" a large connecting pipe between the two tanks allows for the fuel to migrate to its own level.
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