I am restoring our school's biodiesel processor and want to see what advice you have for storing the pumps. The system may not be used by another group of students for months or even years at times. The pumps have been restored but I am worried that we haven't yet figured out how to store them so they won't be ruined in the future. When we started, the pumps were seized and had a varnish-like deposit on them. Since then, we have only had water in the pumps and were careful to drain them after testing but still had to crack open a pump to free the impeller.
We have two 2" Harbor Frieght (HF) pumps that only move WVO for filtering and dewatering, and a large steel rotary gear pump that mixes our biodiesel.
Should we be careful to drain all the oil out of the HF pumps between batches? Should we leave them full of oil? Should we rinse them with water and spray WD-40 in them?
Should we drain the large pump every time (this would be very difficult) or can we leave it half full of biodiesel if the next batch is to be made within weeks?
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