I have a fuel line check valve between my axillary electric fuel pump
and the mechanical one.(I don't know if it is a "bleeder" type..not
sure what that means). Anyway I discovered a fuel leak during my
pre-flight when I turned on my backup electric fuel pump on my 0200A
Continental engine. The fuel pressure backed up to the outflow on the
mechanical fuel pump where the leak was found at the outflow side fuel
fitting. I figure this could only happen if the check valve is not
doing its job unless a little back flow is normal. Anyway I'm going to
replace the fitting as the sleeve is the source of the recent leak. Are
check valves servicable? What typically goes wrong with thim? Thanks
for your thoughts on the matter..

Larry