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as far as I know there is
1 fuel line to engine
1 return line from engine
1 vent line up to near air filter canister
1 auxiliary feed line
1 auxiliary return line
the auxiliary lines can be either ambulance heater, or now that I think about it there were some comms type boxes that had a...
You sure they are vent lines?
Most trucks will have a second set of lines installed that don't go anywhere; they are intended to go to the heater in the ambulance body as far as I know.