Question 204Motor Plants - 1st Asst/Chief

The correct answer is D) blood poisoning. The principal hazard to personnel when using a diesel engine fuel nozzle tester is the potential for blood poisoning. This is because the fuel nozzle tester involves handling and exposure to diesel fuel, which can be absorbed through the skin and enter the bloodstream, potentially leading to blood poisoning if proper safety precautions are not taken. The other answer choices are not the principal hazards in this situation. Electrical shock (A) is not a major concern with a diesel fuel nozzle tester, as it does not involve high-voltage electrical components. Toxic fumes (B) can be a hazard, but blood poisoning is the more significant risk. An explosion (C) is not a primary concern when using the tester correctly.