A vehicle fuel gas pre-filter unit can include a housing, a filter, and an inlet valve. The housing is installed in a vehicle structure that includes an outlet valve. The filter is located in the housing and between the inlet and outlet valves with respect to fuel gas flow through the pre-filter unit. The inlet valve permits and prevents gas flow into the housing and has a valve head that opens and closes an inlet port. The outlet valve permits and prevents gas flow out of the housing and eventually to a vehicle fuel gas storage tank. The outlet valve has a valve head that opens and closes an outlet port.