Originally Posted by Barbels
I know most folks say their Eheim's easy to prime, but priming my 2026 gives me a hard workout every time. I HATE priming that sucker.
I'll guess that you start it before the tank is filled up all the way. The primer can only move the water about 4 inches so trying when the tank level is more than 4 inches from the edge is a waste of time. If that isn't it, then you probably have a loop in the line that has an air bubble in it.
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110G, 10 adult discus, barebottom with plants on wood
58G, 3 adult discus, barebottom with plants on wood
59G thickly planted tanks, rummey nose tetras, kuhlies
300G goldfish pond outside