Yes, this does mean that,

Caution shall be exercised when priming a carburetor to prevent any damage.

= (maximum) Caution

shall be exercised when filling fuel to a carburetor You

can search up in the internet, it is well known.

What does the

word ‘Infallibility’ mean? We asked for a boy to communicate with the children

b. You need a key in order to open a door.

c. Is it just a hack for you to log into a Google

account?