ok, i replaced the regulator spring, diaphram, plunger, and gasket. fuel tank, fuel lines, and fuel valves. i still have a leaky carb when engines not running, and when i release pressure it's more of a gurgle pss, than the PPPSSSSSSSS that i used to get.
heres my original post to clear things up.

http://www.rcuniverse.com/showthread...28&forumid=156]

Did you clean or replace the check valve?

i bought this engine used. i have no manual. please direct my to where the check valve is, or a site where i could get a manual .thanks

Call YS Parts at 775-782-4562. They can sell you a check valve and get you a manual. If you're trying to run it without a check valve, it won't work.