Valves Per Engine: 8; In Fuel Tank; 2 Fuel Pumps may be Required - 1 Externally Mounted & 1 Mounted In Tank; Strainer Included w/ Pump; Failure To Install A New Fuel Strainer (Where Applicable) Will Void Warranty OR Valves Per Engine: 16; In Fuel Tank; 2 Fuel Pumps may be Required - 1 Externally Mounted & 1 Mounted In Tank; Strainer Included w/ Pump; Failure To Install A New Fuel Strainer (Where Applicable) Will Void Warranty