I agree...sounds like a plug in the skimmer line. Did you have a skimmer basket in place while you were vacuuming leaves? That's the first line of defense for catching stuff, pump basket next, then the filter. You could have sucked up something like a twig that got stuck in a bend in the pipe then leaves got piled up. Try a garden hose into the skimmer line thru the inlet to the pump basket housing. Will have to pack rags around the hose or something to get a little pressure backwards thru the skimmer line.
Al