I recently bought a Little Giant pump, model 3-md-mt-hc. I use Keggles in my all-grain system and I can consistently get siphon on all keggles and completely drain them with no dead-space if I manually induce siphon (suck on the hose). The pump seems to struggle to create siphon and generate a consistent outflow of water or wort. If I can manually create siphon, then there are no leaks in my keggles, diptube and connections. Is this pump simply not up to the challenge? Should I swap it out for a larger duty unit? Thanks.