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Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
UltralightNews.com
process. More than one pilot has had to land with an engine out only to discover plastic lodged in his fuel pump.
A fuel filter should be installed in the fuel system prior to the pump to prevent any foreign
material from entering it. If for any reason the filter is removed and is going to be reused make
sure that the direction of flow is the same as when it was removed.
Several pilot has reported re-installing their fuel filter backwards, depositing all the foreign
material collected directly into their pump and carburetor. Most quality filters have arrows
showing the direction of fuel flow.
When considering fuel tank location, try to make it as close to the engine as possible
with the least amount of vertical draw. Although the Mikuni pump has been known to
draw fuel vertically over 4 feet the recommended maximum distance is only 24 inches.
Make sure all fuel tanks are properly vented. Many ultralight manufacturers use a
standard marine fuel tank, with a vent on the handle (or gas cap) that can be screwed
in to seal for transportation.
The problem here is that the vent can vibrate closed, or can be inadvertently left
closed. This allows the engine to run for a short period of time before it runs out of
gas, just about the time your 50 feet in the air.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
All lines should be carefully clamped, with clamps that do not pinch the line.
The fuel system should have some kind of a water trap, this can be as simple as a
loop in the line used to join the two gas tank halves together on a root tube
mounted tank.
A proper in line filter with a drain cock, or a pickup line located an inch from the
bottom of the tank.
During initial installation of the tank it should be inspected to make sure that no
plastic is present, inside, from the drilling of holes, or from the manufacturing
