I agree with Thall, Vernon. You should take the time to clean this little Kioritzsu baby up, find the source of the fuel leak and repair it and get 'er back in her best Echo-mule shape. If you think it's too much time and effort, turn her over to one of us and let us tinker with her.... They are, after all, only about a $50-80 saw running good, but I like the "JD" 30, 40, 50, 60 saws. I have a 40V and a 50V and, although I got 'em cheap (less than $15) and not running, a little time on the bench and a few parts from some Echo's, and I have a couple of nice little yellar John Deere's that I'm gonna enjoy using once in a while and looking at all the time.
Recovering old rusted chain can be an onerous task. Sometimes it's not possible to totally reclaim them from the rust. But I've reclaimed two old 1/2"-pitch chains which were totally froze-to-the-bar by soaking them alternately in gas and oil and in between wire-brushing, gently hammering/tapping the rivet back and forth over the horn of an anvil, (watch out not to damage the cutters, rakers, drivers nor side-plates), working them by hand, re-soaking, re-cleaning, and doing it all again, until finally getting a limber, flexible, clean chain...... A lot of work.... but, to me, at least, worth it for a chain which fits an old saw and is a little hard-to-find NOS. Ya gotta remember that the chain is gonna be under high-speed stresses and is only as good as its weakest link, carefully inspect each link, and use some judgement about whether it can serve on a cutting saw again. If you can get a new chain fairly cheaply, do it, and use the old one for garden sculpture....
Ditto with an old rusty bar.
That little 30V is worth restoring. If you don't want to spend the time on it, send me a PM and we'll try to make a deal, and I'll do it. When the bee season ends in November and the winter snows are deep, the old caboose stove radiating good heat, the Springer Spaniels snoozin' under mah feet, all the Old Mac's sittin' ready on the shelves and Marty Robbins a-sangin' over tha workbench, get up that little geisha posin' as a Iowa corn-fed farm girl and fix 'er up again....)