Fleetguard FS1022 Fuel Water Separator – Cummins ISC ISL ISM ISB

The Fleetguard FS1022 is a genuine spin-on fuel water separator designed for Cummins ISC, ISL, ISM, and ISB diesel engines found in medium-duty trucks, buses, motorhomes, and construction equipment. This filter features Fleetguard's advanced StrataPore media technology delivering 10-micron filtration efficiency and 95% water separation to protect modern high-pressure fuel injection systems from damaging contaminants and water. Fleetguard is the OEM filtration supplier for Cummins engines, ensuring this filter meets or exceeds original equipment specifications.

Signs You Need a New Fuel Water Separator

• Water-in-fuel (WIF) warning light illuminated on dash
• Engine hard starting, especially in cold weather
• Rough idle or engine misfires
• Loss of power or reduced acceleration
• Excessive smoke from exhaust (white or black)
• Poor fuel economy or decreased performance
• Visible water or contamination when draining filter
• Service interval reached (typically 15,000-25,000 miles or as conditions require)
• Check engine light with fuel system fault codes

Specifications

Cross References

This part replaces or is equivalent to the following part numbers:

• Fleetguard: FS1022
• Cummins: 3800394, 3945066, 3944269
• Baldwin: BF1272-SP, BF1272-SPS
• Donaldson: P551022
• Wix: 33422
• NAPA: 3422
• Fram: PS8689
• Luber-Finer: LFF1022
• Carquest: 86422
• Case: J800394
• Komatsu: 6744-71-6040
• Hyundai: 11NA-70010
• AGCO: 72511906

Engine Applications

This fuel water separator fits Cummins medium-duty diesel engines:

• Cummins ISC 8.3L: 250-350 HP (1998-2007)
• Cummins ISL 8.9L: 260-425 HP (2004+)
• Cummins ISL9: Current production L9 engines
• Cummins ISM: 10.8L engines
• Cummins ISB: Select 5.9L and 6.7L applications
• Cummins QSC 8.3L: Off-highway/industrial applications
• Cummins 6CTA 8.3L: Mechanical C-Series engines

Vehicle Applications

Common applications for vehicles equipped with Cummins ISC, ISL, ISM, and ISB engines:

• Medium-Duty Trucks: Freightliner M2, International 4000/DuraStar series, Kenworth T270/T370, Peterbilt 325/330/337/348
• School Buses: Blue Bird, Thomas Built, IC Bus with Cummins power
• Transit Buses: Municipal transit applications
• Motorhomes/RVs: Class A diesel pushers with Cummins ISC 8.3L or ISL 8.9L (Holiday Rambler, Monaco, Newmar, Tiffin, etc.)
• Ford Commercial: E-250, E-350, E-450, F-650, F-750 (2005-2007 with Cummins ISB)
• Construction Equipment: Excavators, loaders, and equipment with QSC engines
• Fire and Emergency: Fire apparatus with Cummins ISL power

StrataPore Media Technology

Fleetguard's StrataPore media is a synthetic filtration material that provides superior particle capture and water separation compared to conventional cellulose media. The 10-micron rating protects sensitive high-pressure common-rail (HPCR) fuel injection systems from wear caused by fine particulates. Modern diesel fuel systems operate at pressures exceeding 29,000 PSI with injector tolerances measured in microns, making advanced filtration essential for long injector and fuel pump life.

Water-in-Fuel Sensor

This filter includes a port for the water-in-fuel (WIF) sensor (Cummins 3953517S). The WIF sensor monitors water accumulation in the filter bowl and illuminates a warning light on the dash when water needs to be drained. Always drain accumulated water from the filter at regular service intervals or when the WIF light illuminates to prevent water from reaching the fuel injection system.

Used with filter head 3914857S (ISC engine) or 3962018S. Verify engine serial number and fuel system configuration to confirm fitment. Replace per manufacturer service intervals or when WIF indicator activates.

Handling Time
At All Pro Truck Parts we do our best to ship all orders same day for orders placed before 12:00pm Central Standard Time. Same day shipment is never guaranteed. For standard UPS or USPS shipping, you will typically receive your package in 1 - 5 business days. Shipping times are never guaranteed and All Pro Truck Parts is not responsible for lost or delayed shipments by the carrier. Carrier times vary by distance from shipment origin and may change without prior notice. Shipping price is calculated from package dimensions and weight. Calculated rates for orders will be available at checkout. Orders placed after 12:00pm CST on Fridays will not be fulfilled until the following business day, Monday morning barring a holiday.

Next Day Air Shipments
The cutoff time for UPS Next Day Air is 12:00PM. If you have missed the cutoff time but would still like to place an order for Next Day delivery, please send us a text message or email. We can try to accommodate and ship your order from another warehouse.

Incorrect Shipping prices
All Pro Truck Parts reserve the right to cancel any order, in the event shipping rates are calculated incorrectly at checkout. We will notify you at your provided contact information to give you the option to pay the correct amount, or allow you to cancel the order for a full refund. 

Free Shipping
Select products qualify for free shipping. Qualifying product groups can change without notice. Free shipping will be shipped via UPS Ground, USPS First Class or USPS Priority Mail.  

Domestic Shipping Services

• USPS Domestic Shipping Services
• USPS Priority Mail
• USPS First Class Package
• USPS Ground Advantage
• USPS Priority Mail Express
• UPS Shipping Services
• UPS Ground
• UPS 2nd Day Air A.M. (commercial addresses only)
• UPS 2nd Day Air
• UPS 3 Day Select
• UPS Next Day Air Saver
• UPS Next Day Air
• UPS Next Day Air Early
• UPS Standard

International Shipping Services

• USPS International Shipping
• USPS First Class Package International
• USPS Priority Mail Express International
• USPS Priority Mail International
• UPS International Shipping
• UPS Worldwide Expedited
• UPS Worldwide Express Plus
• UPS Worldwide Express
• UPS Worldwide Saver

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging with exceptions. (See sale items and special order items).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale. 

Defective items (if applicable)
Defective items under manufacturer warranty will be eligible for return, as well as a full refund for the total amount paid by the customer. The following criteria must be met to be eligible. (a). The part is under manufacturer warranty (b). the manufacturer has determined the part defective for the purchased application. 

Refunds (if applicable)
Once your item is returned and received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7 business days. For order placed by phone through a card terminal, you must call in to initiate the refund. 

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded. 

Special Order Items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team. 

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@allprotruckparts.com and send your item to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.

Shipping
To return your product, you should mail your product to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, it is advised that you use a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
For returned items designated as "Free Shipping", any items shipped to the customer in which the customer did not pay shipping. All Pro Truck Parts will recover the cost of shipping to the customer's address from the refundable amount owed to the customer on the return and inspection of the item.