Identify this engine part

[jeff m]

My leaf blower ceased to function.
Took it to bits, I found that fuel lines to the tank had perished inside the tank.
I replaced the lines, reassembled it.
Then.....Oh cr@p...what's that little bit laying on the bench.

This is not a bit I removed, it must have fallen from somewhere !
I have the manual but it does not show this bit.
Blower does not run.
It's 8mm long and too small to have come from the fuel lines.

[jeff m]

Cheers guys,
I'm usually fairly competent at fixing stuff but this has me xxxxxx, it appears to be some sort of non return valve.
I'll throw it in the shop to be repaired and admit defeat