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Ch mack 400 problems


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I have a ch mack 93 with 400 hp bosch german injector pump style engine . it misses now and then under load . we have put an electric lift pump on main fuel line it makes it a little better but still plays up and bypassed lift plunger on pump but still does it .am guessing injector pump is buggered and can i put i higher rated hp pump from same model engine and not have to change anything ? I been told a 427 one will work 

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