Diesel Fuel Tank Inspection

If, during a weekly Diesel Fire Pump test, there is a signal or visual indication at the fuel tank, the pump controller, or fire alarm monitoring system that states the fuel level is below the required 2/3rds mark, should an inspector move forward with that weekly 30-minute pump run? If not, would it be considered a non-critical, critical or impairment condition?

The following is in response to your question based on AFSA’s Technical Review of NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, 2023 edition.

Yes, the inspector should continue to perform the 30-minute pump run. While specific fuel consumption rates are dependent on the diesel engine, there should be enough fuel in the tank to perform the test. The fuel level should be verified weekly by the owner in accordance with 8.2.2(4)(a) and if the tank is not maintained at that level, it should be classified as a critical deficiency based on the guidance in Table A.3.3.8. If the tank runs out of fuel during the 30-minute test, then that condition would rise to the level of an impairment. It should be noted that the table in the annex is only provided as guidance. Ultimately, the classification of the deficiency is up to the responsible party for that inspection and should be determined using the definitions in Chapter 3.