Subscribe to a magazine

Fuel Water Separator Drain Valve

Back to article View Gallery
7 of 18
Our 7.3L had been sitting on a car lot for about a year, and though we did as much preventive maintenance as we thought necessary (new belt, hoses, fluids, and so on), we didn't plan on our fuel-water separator drain valve giving out within the first 200 miles. Located on the back side of the fuel-filter housing, the two O-rings had worn down, allowing diesel fuel to seep past. Luckily, service manager Lee Agee at the Raleigh, North Carolina, 4WP knew right where to look when he saw the dripping diesel, and got us back on the road in no time.