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Fuel Pump Clue requested
A leaking diaphragm will often allow fuel into the crankcase and the oil level will rise, smell like fuel and get really thin. More likely it's a faulty check valve, or if the engine is one that's flown for short flights, the spring in the pump has corroded and broken, reducing the output pressure. The spring is on the crankcase side of the diaphragm and the corrosive moisture and blowby gases can attack it. If this is the case, the magnetos should be looked at as well. Their impulse couplngs can corrode and their springs might break, retarding the timing to around zero BTDC and lowering power to some useless level. A real danger with the Bendix dual magneto used on some Lycs. Both mags are driven by the one gear and coupling. Dan |
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