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| When the engine stalls on deceleration it is usually an indication of lubrication problems in the pump. The first thing that should be checked is the idle RPM. If it is too low it could put the pump governor in a position where it cannot recover from the deceleration quick enough to keep the engine from stalling. If the idle is set to the proper RPM, a lubrication fuel additive like Stanadyne performance formula might be used. In some cases a slight amount of water has passed through the system or an extra dry fuel has been used. This causes the metering valve or plungers & barrels to stick slightly. A lubrication additive (you guessed it Stanadyne performance formula) in the fuel could solve this problem. In severe cases where an additive does not work, the pump needs to be torn down and cleaned. In extremely severe cases the metering valve or plungers & barrels may need to be replaced to solve the problem.
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