Having the car sit with little fuel in the tank is a good way to promote critter growth. They live were water meets diesel. Empty tanks allow condensation from tank walls to accumulate in the fuel and provide habitat.

You might also note increased power loss and stalling when fuel runs low which can sometimes be relieved by fueling up (dilutes the contaminated fuel with fresh fuel) until the filter finally clogs. Biobor is a fuel treatment you buy at marine stores.

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.