Which statement is true when using a nozzle tester to check a diesel fuel injection nozzle's spray pattern?

When using a nozzle tester to check a diesel fuel injection nozzle's spray pattern, it's important to recognize the serious safety concerns associated with the high-pressure fuel systems. The correct statement emphasizes the risk of blood poisoning if high-pressure fuel spray penetrates the skin. This is due to the potential for fuel to enter the bloodstream, which can occur when pressurized fuel is injected through a cut or puncture in the skin. Such injuries can lead to serious health complications, including systemic toxicity and infection.

Understanding this risk reinforces the necessity for safety precautions when handling high-pressure testing equipment. This means wearing appropriate protective gear, ensuring proper handling techniques, and being aware of the physical dangers associated with pressurized fuel systems. The other statements may not encompass critical safety knowledge related to operational procedures and best practices when testing nozzles, making the understanding of blood poisoning risk especially pertinent in this context.