All 45 exams / F-series / ASE F1 Alternate Fuels (Compressed Natural Gas)
F1
ASE F1 Alternate Fuels (Compressed Natural Gas)
Automobiles and light trucks running on compressed natural gas
What's on the F1 exam?
1
Vehicle inspection
2
Equipment installation
3
Leak testing and repairs
4
Emissions
5
System diagnosis
6
Maintenance and repair
7
Cylinder safety
Content-area outline only, authored from ASE's public task-list structure. No test question, answer, or diagnostic scenario is reproduced from ASE or any prep publisher.
F1 quick reference F-series
Categoryrepair technician
Work experience2
Question count65
Time allowed90 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (F1R, approximately half the length of the initial exam) every 5 years, or the ASE Renewal App.
Source: https://ase.com/tests/f1/.
Checked 2026-07-30.
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