Chipmonks have caused problems for me. Several years ago, my 1978 Oldsmobile stopped running about 1/10 of a mile from our house. My wife pushed me back home with the other car. I primed the carburetor and it ran for a few seconds and stopped. I had my AAA towing insurance tow it to my independent mechanic. Fifteen minutes after the wrecker left the driveway, my independent mechanic called me and said that the car was fixed and that the charge would be $10. When I picked up the car, he said he knew the trouble before the wrecker had lowered the car (it had been towed from the rear). He saw gasoline leaking from the engine compartment. A chipmonk had gnawed the neoprene fuel line at the fuel pump which was a mechanical pump operated by the camshaft on the engine. Raising the rear of the car caused it to leak gasoline. Another time, my air conditioning compressor wouldn’t come on. After checking the circuit breakers and finding that I had power at the outdoor compressor unit, I called the HVAC company that does my work. Chipmonks had chewed the low voltage wire in the crawl space.
More recently, I had my 2011 Toyota Sienna in for an oil change. The service technician found squirrels had stored some nuts under the cover on top the engine. No damage had been done and I was not charged for removing the nuts. I had them check my 2003 4Runner and there was no evidence that squirrels had been under the hood.
Our previous dog, a mixed breed that was part Jack Russell terrier was very good at keeping down the chipmonk population and driving the squirrels back up the tree. I started having the problem after she passed away. My present dog doesn’t think that going after chipmonks is in his job description.