I decided to switch to 1/8 inch ID hose of couplers about 3 or 4 inches long. It fits really tight on the pump and I push about an inch of the original silicone hose into it on the other end. So it's really satisfyingly tight as to fluid. However, the 90 degree bend collapses pretty much at the rear wall of the house. But, fluid flows readily thru it. The bends push strongly on the wall.
The limiting factor with all these solutions is the bend at the wall. If the wall were one inch farther out, all the bend issues would go away. I need to fashion an addition of a tool box to the back of the wall. Lionel could sell those as an accessory for $25 each 
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