Note for 172, 172A,B,C aircraft models: Only eligible for use with the upgraded Cessna vent assembly 0523552-2. These aircraft originally used 1/4" vent lines, however they may be upgraded to a 3/8" vent line with the installation of the P/N 0523552-2 vent assembly per the applicable IPC.

Due to the size and shape of the fuel vent lines, this product cannot ship via USPS First Class Mail service.

Note: The check valve is not included with the fuel vent line.

Improved Fuel Vent Lines

Stops fuel waste!

• Stops asphalt damage
• Stops environmental damage
• Fly with full tanks
• Extends useful range
• Pays for itself quickly at $5 per gallon
• Adds value to your airplane
• FAA-PMA direct replacement, no STC or 337 form needed

Instructions for Continued Airworthiness

Installation Details for Installing McFarlane Fuel Vent Lines

The fuel vent line on most Cessna single engine aircraft attaches to a check valve inside the tank to prevent fuel from flowing out of the vent line, but this valve has a weep hole that allows some fuel to pass to prevent pressurization of the fuel tanks. Unfortunately, this weep hole is much lower than the fuel level of a full tank. Fuel will continuously leak out of the vent line until the fuel level is below the weep hole. With the original vent line, you cannot fill the tanks without wasting a lot of fuel.

The Cessna heritage aircraft also have a tank interconnect vent line that allows fuel from both tanks to leak out of the vent. When parked on an unlevel surface, the fuel loss from these aircraft may be many gallons.

McFarlane has solved this problem with a redesigned vent line featuring a unique hump that rises above the top of the tank. Some fuel can still escape through the weep hole and out the vent to prevent pressurization of the fuel tanks. However, fuel will stop leaking once the pressure is relieved, and the tanks will remain full.

Convenient Kits
Kits with a new connection hose (where required) and rubber grommet are also available where applicable. Just add a "K" suffix to the part number.