Don't know about the clips, it's 9° so no way I'm crawling under my truck. By couplers if you mean pipe unions, you can use as many as you want. They're used under the dash for air powered wipers, and every where else for air valves on big trucks using 120 PSI air pressure so they'll be trouble free on a low pressure fuel line.
They also make tubing unions with compression fittings, that fit right over the tubing, no threading or sweating. Just cut the bad spot out and put the union in its place, then tighten the nuts till they crush the ferrule. No muss no fuss. There are even 90* unions so you can make a corner without using a bender. They all work well, and hold enough pressure that you should never have any trouble with your fuel line.
1993 F-350 crew cab non-turbo 5 speed transmission
35 years a mechanic on large stationary engines natural gas and diesel fired, and other industrial equipment.