Diesel engines require clean fuel that’s free of air and vapor. But agitation due to the vehicle’s motion introduces air bubbles to the fuel, as does the fuel return system. A fuel air separation system can help your engine deliver more power and extend its life by separating entrained air and vapor from your fuel before it gets to the injectors.

Difficulty Cranking

Air in your fuel will reduce your fuel pressure and make it more difficult to crank. If you see excessive smoke on startup, this is a sign that you’ve got air in your fuel. This problem may be most extreme in cold weather.

Problems in Deceleration and Idle

If you experience a loss of power or stalling when decelerating or idling, this can be caused by air in the fuel. Your injectors are struggling to deliver enough fuel to the engine.

Surging and Low RPM

If your …