My assembly came with the pump tube already on the pump body with an ear clamp. Directions are to trim the discharge and return tubes to accommodate tank depth, and then install pump/sock. I'm guessing worm gear clamp was specified because most customers might not have access to ear clamp pliers. I don't think it was a clamp issue that broke mine. I think it was because the outlet nipple was plastic, and the outlet tube was pretty unflexible. Combine that with a small hole, and it must've snapped off somewhere in the process. They included 2 sock screens: One for use in a retrofit app, and one for use with a Tanks, Inc. tank. I used the retrofit, which is a fairly long "wet screen" style. It seemed pretty cool, and should allow a large area for fuel suckage. But it is large, and fitting it into the hole is a PITA. I might use the smaller "other" screen that is a more traditional filter screen, just to make sure I don't replicate the same result.
Summit is doing a return for me, which is why I throw lots of $$$ at those guys. Their customer support and commitment is top notch. The replacement isn't supposed to ship until 4/8, tho.
Once I get the pump I will see if the rest of the system is up to snuff. And dayum... submersible fuel hose is ex-pen-sive... $30 a foot!