Exhaust system parts should: Question Exhaust system parts should: Answers Rub against the fuel system. Rub against tires. Not leak. Explanation It is essential that exhaust system parts are not leaking or otherwise broken. A faulty exhaust system can let poisonous fumes into the cab or sleeper berth. This questions appears in the following tests: Arizona Tank Iowa Tank Maryland Class A Knowledge Test Maryland Class B Knowledge Test Virginia Class A Knowledge Test Virginia Class A Knowledge Test
