NHTSA ID Number: 10165416
Manufacturer Communication Number: SB47-027
TSB/Document Date: 2019-09-28
Summary
Service Bulletin for Equiflo Fuel System Breather Tube Inspection
Equiflo Fuel System Breather Tube Inspection
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
> 122SD and Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
> New Cascadia
47-027
Freightliner
Service Bulletin
General Information
The EquiFlo® Inboard Fuel System allows fuel to be drawn equally from, and returned to, each tank so that
their levels remain equal. The fuel tank breather allows the fuel tanks to maintain atmospheric pressure inside
the fuel tanks allowing fuel to be drawn and returned to each tank equally. See Fig. 1.
A fuel tank breather tube that has become restricted (frozen, pinched, plugged, melted, etc) can result in fuel
being drawn and/or returned to just one tank. Intermittent breather restrictions have been seen with frozen snow
slush accumulating on the frame rail side of the fuel tanks. Indications of a problem would be one tank being
low on fuel while the other has substantially more fuel, or one tank running out of fuel without notice.
A design change has been made for new production vehicles to reduce field issues, which includes shortening
the breather tube and securing it to the side of the fuel tank.
If this condition occurs and an inspection of the fuel tank breather shows a restriction in the breather tube,
replace the breather tube using the following instructions.
Freightliner Service Bulletin, 09/06/2019
Page 1
47-027
Equiflo Fuel System Breather Tube Inspection
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
> 122SD and Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
> New Cascadia
7
6
A
5
B
8
4
2
8
3
3
3
2
2
7
1
6
5
3
2
4
1
01/30/2017
f470153
NOTE: Arrows indicate the direction of flow.
A.
1.
2.
3.
To Fuel Pump
Drain
Supply (Suction) Line
Return Line
B. From Engine
4. Fuel Tank
5. Fuel Cap
6. Vent
7. Vent Line
8. Frame Rail
Fig. 1, EquiFlo Inboard Fuel System
Parts
Part Number
48-25024-301
23-14232-000
Description
TUBE-NYLON REINF,3/8
BLUE,FUEL
MOUNT-CABLE
TIE,WIDE,ADHESIVE
Quantity
20 inches
2
Table 1, Parts Required
Page 2
Freightliner Service Bulletin, 09/06/2019
47-027
Equiflo Fuel System Breather Tube Inspection
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
> 122SD and Coronado
Freightliner
Service Bulletin
> Business Class M2
> Cascadia
> 108SD/114SD
> New Cascadia
Fuel Tank Breather Tube Installation For Cylindrical and
Rectangular Tanks
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Shorten or replace the existing blue fuel tank breather tube as follows.
• For cylindrical tanks, cut to a length of 12 inches (30 cm).
• For rectangular tanks, cut to a length of 15 inches (38 cm).
3. Connect the breather tube to the breather.
NOTE: Use the natural roll of the tube to follow the curve of the fuel tank.
4. Trim the end of the breather tube at a 45-degree angle with the tube opening facing to the rear of the fuel
tank. See Fig. 2 and Fig. 3.
NOTE: Clean the fuel tank surface with alcohol before attaching the adhesive-backed cable tie.
5. Install the adhesive-backed cable tie on the fuel tank surface approximately 2.5 inches from the end of the
breather tube. See Fig. 2 and Fig. 3.
2
3
4
5
1
08/19/2019
f470739
1. 45-Degree Cut
2. Adhesive-Backed
Cable Tie
3. Blue Breather Tube
4. Breather
5. Tank Surface
Fig. 2, Cylindrical Fuel Tank
Freightliner Service Bulletin, 09/06/2019
Page 3
47-027
Equiflo Fuel System Breather Tube Inspection
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
> 122SD and Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
> New Cascadia
3
4
2
5
1
08/19/2019
f470740
1. 45-Degree Cut
2. Adhesive-Backed
Cable Tie
3. Blue Breather Tube
4. Breather
5. Tank Surface
Fig. 3, Rectangular Fuel Tank
6. Use a zip tie to attach the breather tube to the adhesive-backed cable tie.
7. Repeat the installation for the fuel tank on the opposite side.
Warranty
This is an information bulletin only. Warranty does not apply. Contact your DSM for issues concerning this
repair.
Page 4
Freightliner Service Bulletin, 09/06/2019
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TSB/Document ID: SB47-027
Replacement Service Bulletin Number:
MFR Communication Date: 2019-09-27
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, GASOLINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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