What is the function of the exhaust valve? Regulate the air-fuel ratio Filter air entering combustion chamber Protect piston from exhaust gases ● Controls flow of exhaust gases out of the combustion chamber

Gasoline in a fuel tank has been contaminated with water from condensation. Tech a says it will stay on the surface of the fuel and can be skimmed (removed) off. Tech b says that it will dissolve in the gasoline and be burned during the combustion process. Who is correct?

Which of the following statements regarding the “Pre-Emission Inspection Check” Of a diesel powered vehicle that is subject to Opacity (Smoke Meter) testing is not true? The governor (if equipped), the exhaust system, and the emissions control devices must all be checked.   The exhaust system must be checked for any missing sections which would prevent collection of a valid exhaust sample.   Vehicles not meeting requirements cannot be inspected. This is not considered an inspection or rejection and no fee is to be charged.   The governor, if originally equipped, must be checked for presence, connection, and operation.

An O-ring at the base of a fuel injector ______.   provides thermal insulation to allow the formation of vapor bubbles   increases potentially damaging vibrations   dampens vibrations and seals the injector of vacuum leaks   seals the injector to its upper mounting position