Lear Romec Fuel Pumps

Lear Romec Fuel Pumps Rock solid simplicity (with a few rough edges) By Randy Knuteson July 2000 Nome, AK. The pilot was about a mile out and on final approach when he first noticed flames blazing from the left engine nacelle of his Piper...


Consult the Pilots Operating Handbook for the best course of action to correct vapor lock. Generally speaking, there are two options: 1) allow the airplane to cool, returning the vapor to its liquid state, or 2) turn the boost pump on, forcing the vapor through the system. Textron Lycoming recommends that the fuel boost pump be used "whenever there is any possibility of excessive vapor formation," or when "a temporary cessation of fuel flow would introduce undesirable hazards." However, if the boost pump is employed for ground operation, always be certain to check the integrity of the engine-driven pump before takeoff by turning the boost pump off momentarily then back on again for takeoff. If the pump operates satisfactorily while on the ground, it's safe to say that it will perform well in the air.

A glance back

In the early 1900s, mechanical pumps were commonly used in steam engines. Rotary Machine & Engineering Company (ROMEC) was started back in 1918 in an effort to satisfy these and other industry demands. Coinciding with these needs were the requirements within the aviation arena for a "positive displacement" engine-driven fuel pump. The aftermath of World War I brought with it an increased interest in the possibilities associated with the fuel injecting and turbocharging of aircraft engines. Aircraft would no longer rely solely on gravity to perform the function of feeding fuel to the engine.

Engine-driven fuel pumps provided a means of discharging fuel under pressure in a volume exceeding engine demands. Because of this, Romec pumps were used extensively throughout the '30s and '40s by both the Air Corps and the Navy, allowing these aircraft to climb to higher altitudes. Pesco, Titan, and Thompson pumps were also used to fuel a steadily growing fleet of aircraft. All four companies used similar technology in their respective pumps. The basic principle of operation remained the same - an eccentric sliding-vane type of pump. As the rotor is turned the vanes carry fuel from the inlet to the outlet of the pump. They are capable of pumping fuel in either direction with equal efficiency if the pumps direction of rotation is reversed. Like most of aircraft technology, these pumps have remained relatively unchanged over the years, primarily due to their elegant simplicity and proven track record.

Randy Knuteson is director of operations for Consolidated Fuel Systems Inc. in Montgomery, AL.

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For more help or information on Romec Fuel Pumps, contact Consolidated Fuel Systems, Inc. at (334) 286-8551, or contact Lear Romec at (440) 323-3211.

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