A gravity feed fuel system operates at low pressure. Moderate restriction caused by a fuel filter can reduce the fuel pressure to a dangerous level and cause a lean the air/fuel mixture. The air/fuel mixture needed for combustion may not be enough to keep the combustion chambers cool while operating under load. If an engine is running so lean that the piston and chamber have heated up more than tolerances will allow, the piston may grind against the cylinder wall until it freezes. Excessive heat can burn a valve or melt a hole in the piston.
It would be interesting to find out if melted pistons are a common failure in IH engines?
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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