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| In most cases low power accompanies other systems such as smoke or a miss. In these cases the other symptoms should be researched first and when fixed the low power is usually fixed also. If low power is the only complaint then quantity of the fuel supply should be checked. On engines that have primary supply pumps the supply pump has been found to put out the propper pressure without pumping the proper quantity of fuel. A fuel restriction should also be researched, partially plugged fuel filters, blocked fuel lines and filters in the tank on some applications. If the tank is not vented properly it could build a vacuum which could act like a fuel restriction. Poor fuel quality can also result in low power. If the fuel system is getting air mixed with the fuel, low power is often the result. Air intake restrictions, exhaust restrictions, transmission problems and internal engine problems have also been known to cause power problems.
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