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Definitely if there is the possibility of grime getting into the fuel tank via unreliable sources, like here in Africa fuel from a 45Gal drum that stands open in the veld for unknown hours, then yes a strainer is necessary. All the submersible pumps I worked with, came with it's own strainer, it is only there to prevent big stuff to enter the pump the fuel filter further on in the system prevents micron stuff from entering the final fuel system, that is more critical and need to be changed regularly! So yes if you want to protect the pump you have to have a strainer
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