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International Automotive Technicians Network
Re: What is causing fuel pumps to sieze up when shut down?
Posted to Technical Theory Forum on 2/21/2020

As others have stated, the most common failure mode on brushed DC fuel pumps is wear at the brush to commutator interface. This causes burned spots on the commutator where current can't flow. [generic BAD fuel pump]. If the pump stops on a bad spot, it's open ... Login to read more.

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