estaban reabasteciendo
-they/you were refuelling
Imperfect progressive ellos/ellas/ustedes conjugation of reabastecer.

reabastecer

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Rellenar el evaporador con líquido se puede hacer de dos maneras - a través del fondo, ya que todos los tanques de la familia Subtank estaban reabasteciendo combustible, o por la parte superior.
Refilling the evaporator with liquid can be done in two ways - through the bottom, as all the tanks of the Subtank family were refueling, or through the top.
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