Edelbrock 644123 EFI Adapter Fitting -6 An Male To 3/8" Sae Quick DiSConnect Female SCrew Type Blk Anodized Finish

Does this need a perfectly straight/flush line or a line with a flare on it? I have a 3/8" pipe with a little ridge that the rubber hose grabs.

Will this fit 5/16 fuel rail on the 5.3 lm7 engine

Will this work with my flex fuel sensor? It has 3/8 OD tubing.

Can I use these with push and lock fuel hose?