How often should the performance of filters be checked?

• A. Every 7 days
• B. Every 14 days
• C. Every 30 days
• D. Every 60 days

Answer: (C)

Regular maintenance timing for fuel filters is monthly. In fuel systems, filters trap contaminants that can clog passages and stress pumps. Checking performance every 30 days provides a practical balance: it catches rising pressure drops or declining flow before problems escalate, without overburdening maintenance.

During the check, you verify that there is adequate fuel flow, measure the pressure differential across the filter to ensure it’s within specs, look for leaks, and confirm that any bypass indicators aren’t active. If the pressure drop is too high or flow is reduced, the filter should be serviced or replaced.

Checking more frequently (weekly or biweekly) isn’t typically necessary for standard conditions and adds unnecessary workload, while extending to 60 days risks missing developing issues. The 30-day interval is the standard practice.