I had this same issue when I was first testing my Little Giant. I bought cheapo vinyl tubing from Home Depot so I could work on the system before my Clearflex came in. When I hooked everything up and plugged it in it totally collapsed the intake tube to the point where there was almost no flow. When I bought some heavy braided tubing to fix this problem the results were 100% better.
In my current setup I'm using rigid 3/4" ABS pipe as a straight connection from my reservoir to my pump in order to avoid this issue altogether.
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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