31 Fuel & air parts are listed for the 2021 Freightliner M2, in 5 part types, covering all 8 engine options (12.8L L6 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and more). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Freightliner M2, the fuel & air system meters fuel and air — pumps, injectors, filters, intake components and the sensors that balance the mixture. 28 parts of the 31 listed are Fuel Filter (14 parts), Air Filter (10 parts) and Fuel Filter Gasket (4 parts). The other 2 part types cover the remaining 3 parts.
The 2021 Freightliner M2 was sold with 8 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
6 brands supply fuel & air parts for the 2021 Freightliner M2, led by WIX (11 parts), HASTINGS / BALDWIN (8 parts) and ELRING (5 parts), plus 3 more brands. Quality grades include Locking Replacement and Standard Replacement.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Freightliner M2. 6 parts have it, including WIX 42809 (Air Filter) and HASTINGS / BALDWIN FF1227 (Fuel Filter). Each part number opens a page with every vehicle that part fits.
Air Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX Popular Fits: 12.8L L6 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 42809 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | PRIMARY | View on Amazon |
| WIX Popular Fits: 12.8L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | 42812 | 🇺🇸 US 🇨🇦 CA | M2 112 | View on Amazon |
| DONALDSON Fits: 12.8L L6 DIESEL Turbocharged | P616400 | 🇺🇸 US 🇨🇦 CA | Safety | View on Amazon |
| DONALDSON Fits: 12.8L L6 DIESEL Turbocharged | P607955 | 🇺🇸 US 🇨🇦 CA | Outer Diameter: 306.5 mm (12.07") | View on Amazon |
| HASTINGS / BALDWIN Fits: 12.8L L6 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | AF2377 | 🇺🇸 US 🇨🇦 CA | Channel Flow | View on Amazon |
| HASTINGS / BALDWIN Fits: 12.8L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | AF2405 | 🇺🇸 US 🇨🇦 CA | Channel Flow | View on Amazon |
| HASTINGS / BALDWIN Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | AF2376 | 🇺🇸 US 🇨🇦 CA | Channel Flow | View on Amazon |
| MANN Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | C332019 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WIX Fits: 12.8L L6 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | 49910 | 🇺🇸 US 🇨🇦 CA | Secondary | View on Amazon |
| WIX Fits: 8.9L L6 DIESEL Turbocharged | 49959 | 🇺🇸 US | Flame Retardant Media | View on Amazon |
This table covers the engine air filters in the intake box. Typical signs include hesitation, a dirty film in the air box, or a filter so packed it collapses. Seat the new filter in the box so unfiltered air cannot bypass the seal.
10 Air Filter parts are listed for the 2021 Freightliner M2, from WIX, HASTINGS / BALDWIN, DONALDSON and 1 other brand. WIX 42809 carries the "Popular" badge.
Fuel Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN Popular Fits: 12.8L L6 DIESEL Turbocharged | FF1227 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX Popular Fits: 12.8L L6 DIESEL Turbocharged | WF10103 | 🇺🇸 US 🇨🇦 CA | Kit of 2 Filters | View on Amazon |
| WIX Popular Fits: 8.9L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | 33416 | 🇺🇸 US 🇨🇦 CA | Spin-On Fuel Filter | View on Amazon |
| WIX Popular Fits: 8.9L L6 DIESEL Turbocharged | WF10564 | 🇺🇸 US | Spin-On Filter | View on Amazon |
| HASTINGS / BALDWIN Fits: 12.8L L6 DIESEL Turbocharged | PF46269KIT | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| HASTINGS / BALDWIN Fits: 12.8L L6 DIESEL Turbocharged | PF46145 | 🇺🇸 US 🇨🇦 CA | Element | View on Amazon |
| HASTINGS / BALDWIN Fits: 5.1L L4 DIESEL Turbocharged | PF46235 | 🇺🇸 US 🇨🇦 CA | Fuel/Water Separator | View on Amazon |
| HASTINGS / BALDWIN Fits: 8.9L L6 Turbocharged | FF1253 | 🇺🇸 US 🇨🇦 CA | Coalescer | View on Amazon |
| MANN Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | PU11013Z | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M2 106 | View on Amazon |
| MANN Fits: 8.9L L6 DIESEL Turbocharged | WK10036 | 🇺🇸 US | Outer Diameter Top: 4.01 In | View on Amazon |
| WIX Fits: 12.8L L6 DIESEL Turbocharged | WF10689 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX Fits: 12.8L L6 DIESEL Turbocharged | WF10678 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | WF10568 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M2 106 | View on Amazon |
| WIX Fits: 8.9L L6 DIESEL Turbocharged | WF10635 | 🇺🇸 US | Cartridge Filter | View on Amazon |
This table covers the fuel filters in the line or at the tank. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
14 Fuel Filter parts are listed for the 2021 Freightliner M2, from WIX, HASTINGS / BALDWIN and MANN. HASTINGS / BALDWIN FF1227 carries the "Popular" badge.
Fuel Filter Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 12.8L L6 DIESEL Turbocharged | 002970 | 🇺🇸 US 🇨🇦 CA | Inner Diameter [MM]: 114,2Outer Diameter [MM]: 119,36 | View on Amazon |
| ELRING Fits: 12.8L L6 DIESEL Turbocharged | 003010 | 🇺🇸 US 🇨🇦 CA | Outer Diameter [MM]: 130,8 | View on Amazon |
| ELRING Fits: 12.8L L6 DIESEL Turbocharged | 003020 | 🇺🇸 US 🇨🇦 CA | Outer Diameter [MM]: 81,11 | View on Amazon |
| ELRING Fits: 12.8L L6 DIESEL Turbocharged | 653980 | 🇺🇸 US 🇨🇦 CA | Inner Diameter [MM]: 110,7Outer Diameter [MM]: 116,9 | View on Amazon |
This table covers the gaskets that seal the Fuel Filter. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
4 Fuel Filter Gasket parts for the 2021 Freightliner M2 come from ELRING.
This group includes ELRING 002970, ELRING 003010 and ELRING 003020 and the remaining parts above.
Fuel Injector Seal / O-Ring
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 12.8L L6 DIESEL Turbocharged | 002750 | 🇺🇸 US 🇨🇦 CA | Fuel Injection Nozzle Holder | View on Amazon |
This table covers the O-rings and seals on each injector. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove.
One part is listed for the 2021 Freightliner M2 — ELRING 002750.
Fuel Tank Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | 250200 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Locking Fuel Tank Cap | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | 200200 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Fuel Tank Cap | View on Amazon |
This table covers the caps that seal the fuel filler neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable.
MOTORAD supplies both parts for the 2021 Freightliner M2.
The Locking Replacement section lists 1 option from MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. MOTORAD 250200 is listed in this group.
The Standard Replacement section lists 1 option from MOTORAD — built to original-equipment specification. MOTORAD 200200 is listed in this group.
This group includes MOTORAD 250200 and MOTORAD 200200.
Buying Fuel & Air Parts for a 2021 Freightliner M2
On this vehicle, the fuel & air system meters fuel and air — pumps, injectors, filters, intake components and the sensors that balance the mixture.
- Match the engine first. Every fuel & air part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, check the air filter with any intake or injector work — a clogged filter skews every mixture reading downstream.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Fuel Filter and Air Filter .
Frequently Asked Questions
How many fuel & air parts fit the 2021 Freightliner M2?
Our catalog currently lists 31 fuel & air parts for the 2021 Freightliner M2 across 5 subcategories and 6 brands, covering all 8 engine options (12.8L L6 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do fuel & air parts differ between 2021 Freightliner M2 engines?
Yes. Every fuel & air part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of fuel & air problems on a 2021 Freightliner M2?
Common symptoms include long cranking before start, hesitation under acceleration, worsening fuel economy, or a whining fuel pump. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, check the air filter with any intake or injector work — a clogged filter skews every mixture reading downstream.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Freightliner M2 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Freightliner M2?
First match the engine — each row shows which engine(s) the part fits. Then replace the fuel filter when doing a pump, and never run a new pump on a near-empty rusty tank — debris is what killed the old one. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Freightliner M2
Fuel & Air Parts for Other Freightliner M2 Years
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