Cummins diesel engines are among the most widely used power sources for generator sets and industrial equipment worldwide. Unlike some engine families that are organized by displacement series, Cummins parts — especially filtration — are most commonly ordered by Fleetguard part number, since Fleetguard is the OEM filtration brand across the Cummins engine range. This guide covers how Fleetguard part numbers work, the parts you’re most likely to need, and how to make sure what you order is genuine.
Understanding Fleetguard part numbers
Fleetguard part numbers use a consistent letter-prefix system that tells you what type of filter you’re looking at before you even check the digits:
- LF — Lube (oil) filter
- FF / FS — Fuel filter or fuel/water separator
- AF — Air filter
- WF — Water (coolant) filter
Once you know your engine’s Fleetguard part numbers, cross-referencing is straightforward — the same part number identifies the correct filter regardless of which specific Cummins engine or generator set it’s fitted to.
The most commonly needed Cummins parts
Lube (oil) filters
The highest-turnover category, replaced at every scheduled service:
- Fleetguard Cummins LF16015 Lube Oil Filter
- Genpac cross-reference equivalent, part no.
LF16015-1391 - Also available:
LF14000NN,LF9050,LF3703,LF9070,LF9009
Fuel filters & fuel/water separators
- Fleetguard Cummins FS1006 Fuel Water Separator
- Also available:
FF5421,FS1251,FS1221,FS1040
Air filters
- Fleetguard Cummins AF928M Air Filter
- Also available:
AF25962,AF25278
Water (coolant) filters
- Fleetguard Cummins
WF2075Water Filter - Fleetguard Cummins
WF2126Water Filter
Turbochargers
Browse the full range: Cummins engines parts.
Fleetguard vs. Genpac cross-reference — same filter, two ways to buy
For many of the most common part numbers, we stock both the Fleetguard-branded original and a Genpac cross-reference equivalent listed under its own SKU (for example, LF16015 is available both ways). Both are built to fit the same filter position — the choice comes down to whether you specifically want the Fleetguard brand name or are comfortable with a verified cross-reference equivalent at a different price point.
How to identify the right part for your engine
- Check your generator set or equipment’s existing filter. The Fleetguard part number is usually printed directly on the filter housing, which is the fastest way to confirm what you need for a replacement.
- Match the letter prefix to the filter type.
LFfor oil,FF/FSfor fuel,AFfor air,WFfor water/coolant — this alone rules out most wrong matches. - When in doubt, ask before ordering. Send us your engine model or the part number printed on your current filter and we’ll confirm the correct match before you buy.
Genuine parts vs. aftermarket
Filtration is a consumable, replaced on every scheduled service, which is why a verified cross-reference equivalent (like our Genpac range) is a reasonable and common choice for lube, fuel, and air filters. For the Fleetguard brand name specifically, or for non-filtration components like turbochargers, going with the OEM-branded part is the safer call where fit and internal tolerances matter more.
FAQ
What does the Fleetguard part number prefix mean?
LF is a lube (oil) filter, FF and FS are fuel filters or fuel/water separators, AF is an air filter, and WF is a water (coolant) filter. Matching the prefix to your filter type is the fastest way to narrow down the right part.
How do I find the right Fleetguard filter for my Cummins engine?
Check the part number printed on your current filter’s housing — that’s the most reliable way to confirm what to reorder. If you’re not sure, send us your engine model or the number on your old filter and we’ll confirm the correct match.
What’s the difference between a Fleetguard filter and a Genpac cross-reference filter?
Both are built to fit the same filter position on your Cummins engine. Fleetguard is the OEM filtration brand for Cummins; Genpac cross-reference filters are a verified equivalent listed under their own SKU, often at a different price point.
Where can I buy genuine Cummins engine parts online?
Ghaddar Machinery Co. stocks both Fleetguard-branded and Genpac cross-reference filtration for Cummins engines, plus turbochargers and other components, with clear part numbers matching Fleetguard’s own system.
How often should Cummins filters be replaced?
Filter replacement intervals vary by engine model and application — check your equipment’s service manual for the exact interval, and keep a note of your Fleetguard part numbers so reordering is quick each time.
Need help identifying a part?
Send us your engine model or the part number on your current filter and we’ll confirm the exact match before you order — Contact Ghaddar Machinery Co.
