Core Services

Fuel Leaks, Integral, & Bladder Cell

Fuel leaks in aircraft are one of the most frustrating and misunderstood problems with aircraft today.


Because of the wide variety of aircraft and each with its own peculiar problems it is difficult to understand and keep up with each one, knowing just how and where the leaks occur and the quickest method of finding and making the repair to expedite returning the aircraft to service.


Numerous factors contribute to the causes of fuel leaks, age of aircraft, stress points, hard landings, rough weather, improper or poorly accomplished structural repairs to the fuel tanks and inexperienced or unwilling personnel attempting to repair a leak. For these and many other reasons we at Aviation Fuel Systems Repair, Inc. have specialized in learning each aircraft and the problems it has, relaying this information to our people through intense training both in house and through on the job training.


When an AFSR team arrives you can be sure you are getting the best qualified and capable repair team in the industry.

Bacteria & Corrosion Control

Bacteria in aircraft fuel tanks, is an ongoing maintenance problem. A number of things can contribute to this type of fuel contamination. One is using fuel that is already contaminated, another is not keeping the tanks properly sumped and inspected.


The organisms that live in petroleum products are called CLADOSPORIUM RESINAE and PSEUDOMONAS AERUGINOSA. These can enter the fuel system through the tank vents, standing water in the sump bottoms or as mentioned before, fueling with contaminated fuel.

The organisms exist in the water and feed off the Hydrocarbons in the fuel. As they grow they form mats that are dark in color and appear gel like. Their waste produces water, sludge and acids that eventually cause corrosion in the metal surface they come in contact with.


Some of the signs of microbiological growth are clogged filters, sulphur smell and brown slimy formations on the lower surface of the fuel tanks.


As of now there are no products that will completely prevent the growth of bacteria in the fuel tanks. However there are several products that help keep it to a minimum. Proper maintenance is the only way to keep it in check.


Once it is discovered in the fuel system it can be brought under control by accomplishing a thorough inspection of the entire fuel system, then spraying and scrubbing the tank with an anti-bacterial cleaning solution that helps kill and retard future growth. This, in addition to fuel additives and periodic inspection on the fuel system, will prevent serious damage from corrosion.

Structural Repair / Modification

Because some fuel leaks are caused by stresses and structural changes to the fuel tanks, a certain amount of structural expertise is required.


We have the trained and qualified personnel to handle such issues, eliminating the need for an additional supplier.

Custom Equipment

Aviation Fuel Systems Repair, Inc. designs and manufactures equipment specifically for the purpose of testing and repairing aircraft fuel systems.


Aviation Fuel Systems manufactures all the equipment necessary to perform pressure tests for the purpose of locating and repairing fuel leaks on all types of aircraft. Everything from manometers, test panels and block off plates.


Kits may be complicated as to accommodate several types of aircraft integrated into one Kit, or a kit may be tailored to one specific aircraft. This equipment is custom designed and manufactured to meet the needs of the individual customers and the aircraft they operate.


When a piece of equipment is needed and is not available on the market, all you need to do is tell us what you need and what you want it to do. We will do the rest.


Some of the customers we have manufactured equipment for are:


  • Lockheed
  • U.S. Air Force
  • VASP Airlines

We have the latest in equipment for troubleshooting fuel quantity systems on these aircraft.  MD-11, MD10-10, MD10-30, DC-10, DC10-30, B727-200, A300-600, A310-200, and A310-300.