![]() ![]() It can be a right/left/ both/off valve, but there should never be more than one. Your fuel system should be controlled with one, and only one, fuel valve.Vent lines should have no low points other than the fuel tank and the outlet for the vent line.For planes that can be built as trigears or taildraggers, builders need to consider that taildragger versions may have low points in the fuel system that trigears do not. Low points in fuel tanks and fuel lines must have drains. Remember that water will seek the low points of any fuel system, and it must be eliminated wherever it collects.Keep the number of fittings and bends to a minimum. ![]() Complexity and reliability seldom go hand in hand. Some bad fuel systems are also simple, but no good fuel systems are complex, at least not on the types of airplanes we are concerned with here. Good fuel systems are simple fuel systems. ( See a complete analysis of this report by Ron Wanttaja). Even though our focus is firewall forward, a broader look at fuel systems seems appropriate, especially in light of the recent NTSB report on Experimental/Amateur-Built aircraft. Perhaps the simplicity of the systems engenders a casual attitude, or maybe some builders can’t resist the urge to “improve” things. Proper firesleeve installation is not yet complete in this photo.įuel systems for most Experimental/Amateur-Built airplanes are fairly simple, but fuel problems account for a fair share of Experimental airplane accidents, especially on first flights and during the Phase I flight-test period (25 or 40 hours). The author test-fits a fuel line to the gascolator on his Sportsman with a Lycoming O-360 engine. ![]()
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