The unit is equipped with a 1/4" hose barb on the fuel transfer pump for
fuel "in" (11/8)
and a 1/4" hose barb on the injection pump for
fuel "return." Although the engine is equipped with a "final"
filter, there should be a primary filter/water separator device between the tank
and the generator. We recommend a filter that is dedicated to the generator,
rather than sharing a filter with the "main" engine. The generator fuel
return connection should be directed back to the source tank. Do not draw fuel
from one tank and return to another tank. Also, do not return the fuel to the
input line. Coast Guard approved hose must be used.