Skip to main content

Air Free

  • Author:
  • Updated:

As careful as I am when changing fuel filters, I often get air into the system and have to bleed the engine. Is there anything on the market that can prevent this? O.H., via e-mail
Racor says its P Series diesel fuel conditioning modules can eliminate air from the fuel system and also prime the filters with clean fuel. The diagram shows the unit installed between the fuel tank and fuel-water separators. On twin-engine applications, two modules are used.

Once your filters have been changed and you wish to prime the engine, engage the electric primer pump via a switch, and fuel is drawn into the unit from the tank and into your filters. After priming, you merely shut the switch, and your engine’s fuel delivery system is ready for normal operation.

In addition, a sensor indicates when it is time to drain the unit. When that happens, merely place a bucket under the drain plug and empty the accumulated water and other materials, making sure to dispose of them properly. The filter element should be changed each season or every 100 hours, or if you notice any loss of horsepower.

The P Series comes in three flow rates of 30, 40, and 50 gph, and the anodized die-cast aluminum housing has 3/8-inch NPT ports for the fuel lines. The current design calls for installation outside of the engine room. More information is available at or (800) 344-3286.

This article originally appeared in the October 2003 issue of Power & Motoryacht magazine.