[mike2004tct]

If it's leaking out the right-end of the pinch clamp, it could be as simple as the O-ring inside the fitting.
If there's a hole in the plastic end itself, you'll need to replace it.
Napa (and probably Autozone,Advance Auto parts etc) sells a repair kit for these types of hoses. They're hot water shrinkable types, where you emerse the new fitting in a tub/bucket of very hot water and shrink the fitting
onto the metal tube part. The bad thing about this, is you need to remove the whole metal gas line, not easy with the amount of decay/rust I see in your picture. In your case, I'd probably get some gas-safe pressure rated hose, cut the two ends off the mating hoses, and clamp on the new rubber hose.

On the Blazers, the feed line is 3/8" diameter, the return line is 5/16".
Get the kit or hose according to the size you need, I can't tell by the pic either(looks to be the return line), but you should be able to easily identify the larger from the smaller hose.

Good luck.