Onan Fuel Filter A026K278
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Onan A026K278 Fuel Filter is a genuine Cummins Onan replacement fuel filter used on select Onan diesel generator applications. Shop Cummins compatibility references list this filter for HDKAG generator models across multiple spec ranges and DKG Spec A applications.
Key Features
- Genuine Cummins Onan fuel filter
- Part number: A026K278
- Compatible with select Onan HDKAG generator models
- Listed for HDKAG Spec A-B, Spec C, Spec D-F, and Spec G
- Also listed for DKG Spec A
- Helps protect the fuel system from dirt, debris, and fuel contamination
Generator Compatibility
Compatible with the following Onan generator models:
- HDKAG Spec A-B
- HDKAG Spec C
- HDKAG Spec D-F
- HDKAG Spec G
- DKG Spec A
Fitment Notice
Confirm the generator model and spec letter from the Onan data tag before ordering. Onan filters can vary by generator model, production spec, and fuel-system configuration.
When This Part Needs Replacement
Replace this fuel filter during scheduled maintenance, after fuel contamination, or if the generator shows hard starting, surging, stalling, restricted fuel flow, or loss of power under load.
Installation Notes
Shut off the fuel supply before service. Inspect fuel hoses, clamps, fittings, and sealing surfaces during replacement. Prime or bleed the fuel system if required and check carefully for leaks after startup.
Alternate/Superseded Part Numbers
- A026K278
Parts Desk Insight
The useful fitment detail for A026K278 is the Onan model/spec match. Check the generator data tag for HDKAG or DKG Spec A before ordering, since Onan service parts often change by spec letter.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.