For a "get home" kludge, a thorough
cleaning (scotchbrite or other fine abrasive) and an alcohol wipe, then a couple of layers of liquid vinyl (liquid lectric, etc.) would probably seal it for a good while, and have the advantage of peeling off clean and easy.
But with
fuel leaks, it is always better to take apart the connenction and properly
repair it. Looks like it just needs to be cleaned and have new gasket/seal installed, of the proper type.