yes
No, they gnaw and chew them.
They don't !
Tree squirrels will chew on a rubber hose to they don't have anything available to do teeth trimming. Squirrels may even chew on parts of your home, patio furniture and non-metal parts of a car.
rabbit rats squirrels mice hamster beaver
Squirrels are larger, in size, but Chipmunks have, usually, three lines down their backs.
Red Squirrels chew pine buds, bark and cone seeds. It is probably a lot easier to do all this chewing on the ground than hanging off the tip of a branch. Branch tips of the ground and large midden piles of pine cone scales and cobs is a definite sign of Red Squirrels.
Fuel lines, carrying fuel.
Very easily
When they chew through the hard shells of nuts, their teeth sharpen themselves also by chewing on twigs etc.
Some sections of the fuel lines are rubber.Some sections of the fuel lines are rubber.
Fuel lines are actually pipes that are used to transport fuel in vehicles. Information about fuel lines can be found in the famous encyclopedia which is wikipedia.