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cojack4646

Heui Pump on C7 Cat 350

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coijack4646,

Welcome to the FMCA Forum.

#1 killer of HEUI pumps is low fuel pressure. This occurred most frequently on those chassis with a single fuel filter (2 micron element) which restricted fuel flow a LOT quicker than the two filter systems with a 10 or 30 micron element followed by a 2 micron element.

An air leak on the suction side of the lift pump will have the same effect with lower PSI to the HEUI pump. But, three failures is really difficult to understand.

Be sure they check fuel pressure from the lift pump -- heck even a pinched fuel hose could create a hard time for the pump.

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