Texas CNG Driver Practice Exam

What is the maximum allowable tank fill percentage for CNG vehicles?

50-60% 70-80% 80-90% 90-100%

Correct Answer:

80-90%

Explanation:

The maximum allowable tank fill percentage for CNG (Compressed Natural Gas) vehicles is 80-90%. This range is essential for ensuring safe operation and effective performance of CNG tanks. Filling to this percentage allows for sufficient expansion space in the tank, accounting for temperature variations and pressure changes that can occur during operation. Overfilling a CNG tank beyond this range could lead to dangerous situations, including increased pressure that may compromise the integrity of the tank and safety mechanisms. Hence, adhering to the 80-90% fill range is critical for maintaining safety standards and ensuring the efficiency of CNG fuel systems in vehicles.

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