I've also seen small worm clamps used. They are sold with in line fuel filter kits for cages. There are differences in the worm design used specifically for fuel lines, as opposed to the general form 'Terry' scaled down worm unit. The small fuel line clamps have a smaller fixed radius, which whilst not eliminating distortion, stll doesn't produce a perfect circle like a crimp ring. The type of fuel hose is important too. A thick walled rubber composite hose on a connecor barb will accept more oval deformation and still seal, helped by the raised barbs ahead of the clamp on the connector. Thin hose walls used for PVC or the stiffer heatshring material are not suited to worm type hose clamps.
Stephejl is correct in what he says, but bear in mind you'll be shortening hoses to fit or replace disconnects in future. Using hacksaws and angle grinders around a 'live' fuel system to remove clips may be tempting - but NOT recommended. The crimp hose clips must be the correct size for the hose and barb.
Some might inadvertantly get crimp clips the wrong size, or use pincers to crimp the clips rather than the correct tool. On balance It's my feeling that those with less competence could choose the wrong clip, have different pipe material and have a bigger problem than a fuel line specific worm clamp, when it's tight they feel it, whereas a crimp ring the wrong size is not so obvious.
I frequently meet this with cable wiring crimps. A badly chosen crimp/tool and wire combination can be worse than a screw down joint.
