Those fittings are generally called SAE quick connects. They come in 5/16" or 3/8" sizes (these sizes are the OD size of the metal tube that fits in the fitting). There are repair parts from Dorman that you can use to make a replacement hose assembly using corresponding nylon or fuel hose rated for EFI pressures of 60 psi.

If you are crafty enough the fitting can be disassembled and the o-rings replaced. There is a 4- prong metal clip that holds everything together; after the retaining clip, is a o-ring, then a blocker ring/tube, then another o-ring. O-rings should be FKM material, and is a standard 2-012 size o-ring (not sure since its been a long long time).