This page lists 8 fuel & air parts for the 2021 Freightliner B2, across 2 part types, covering all 5 engine options (5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged, 8.0L V8 Turbocharged and 8.8L V8). Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Freightliner B2, the fuel & air system meters fuel and air — pumps, injectors, filters, intake components and the sensors that balance the mixture. All 8 listed parts are Fuel Filter (6 parts) and Air Filter (2 parts).
The 2021 Freightliner B2 was sold with 5 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Freightliner B2 fuel & air parts are HASTINGS / BALDWIN (5 parts), WIX (2 parts) and MANN (1 part).
2 parts on this 2021 Freightliner B2 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including HASTINGS / BALDWIN BF63000 (Fuel Filter) and WIX WF10564 (Fuel Filter). Click any part number to see every vehicle that part fits.
Air Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN Fits: 5.1L L4 DIESEL Turbocharged | AF2377 | 🇺🇸 US 🇨🇦 CA | Channel Flow | View on Amazon |
| HASTINGS / BALDWIN Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged | AF2376 | 🇺🇸 US 🇨🇦 CA | Channel Flow | 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.
2 Air Filter parts for the 2021 Freightliner B2 come from HASTINGS / BALDWIN.
This group includes HASTINGS / BALDWIN AF2377 and HASTINGS / BALDWIN AF2376.
Fuel Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN Popular Fits: 6.7L L6 DIESEL Turbocharged | BF63000 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX Popular Fits: 6.7L L6 DIESEL Turbocharged, 8.8L V8 | WF10564 | 🇺🇸 US 🇨🇦 CA | Spin-On Filter | View on Amazon |
| HASTINGS / BALDWIN Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged | PF46235 | 🇺🇸 US 🇨🇦 CA | Fuel/Water Separator | View on Amazon |
| HASTINGS / BALDWIN Fits: 6.7L L6 DIESEL Turbocharged | BF46266SPS | 🇺🇸 US 🇨🇦 CA | Fuel/Water Separator | View on Amazon |
| MANN Fits: 6.7L L6 DIESEL Turbocharged, 8.8L V8 | WK10036 | 🇺🇸 US 🇨🇦 CA | Outer Diameter Top: 4.01 In | View on Amazon |
| WIX Fits: 6.7L L6 DIESEL Turbocharged | WF10917 | 🇺🇸 US 🇨🇦 CA | 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.
6 Fuel Filter parts for the 2021 Freightliner B2 come from 3 brands — HASTINGS / BALDWIN, WIX and MANN. The "Popular" part is HASTINGS / BALDWIN BF63000.
Part numbers include HASTINGS / BALDWIN BF63000, WIX WF10564 and HASTINGS / BALDWIN PF46235, among others listed above.
Buying Fuel & Air Parts for a 2021 Freightliner B2
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 B2?
Our catalog currently lists 8 fuel & air parts for the 2021 Freightliner B2 across 2 subcategories and 3 brands, covering all 5 engine options (5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged, 8.0L V8 Turbocharged and 8.8L V8). Each part is matched to the engine(s) it fits.
Do fuel & air parts differ between 2021 Freightliner B2 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 B2?
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 B2 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 B2?
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 B2
Fuel & Air Parts for Other Freightliner B2 Years
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