The reservoir is an old 10inch tall sweetjar[Roses, ahhh! you can have the [H]ard centres

] it's about 2ltr capacity (lots) it's full to a depth of 7.75inches, both the inlet and outlet are 4-5(slanted cut end) inches under water

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There IS air forming somewhere though, and the cycle nyczeg mentions sounds spot on...
Quote:
I tested my pump with dirt cheap clear vinyl tubing, and 1/2 (actually 5/8 OD) CPVC barbs ($3 and $1). You might consider doing the same, just to check out that the pump is OK.
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Tested it how BB2K?...