Another factor resulting in less frequent changes is the extra paper in the filter element. Under normal conditions, the element can last up to 40,000 miles. The AMS OIL DAHL system includes a reverse flow valve. This holds the prime in the fuel system by not allowing flow back to the tank during shut-down. The AMS OIL DAHL system helps eliminate air entrapment because the inlet and outlet ports are at the top of the unit.
Less resistance means longer pump and element life.
You can be sure that each AMS OIL DAHL unit is designed right, built right and does its job right. Marine units have passed severe U.L. testing and are U.S. Coast Guard accepted for Marine Applications. Tests include fire endurance, vibration fatigue, impact and thermal shock. How the AMS OIL DAHL System Works 1. Contaminated fuel or gasoline enters the inlet port.