FSB-234-018

Mack Trucks, Inc.
Greensboro, NC USA
Field Service Bulletin
Trucks
SB-10055986-3867
This Field Service Bulletin replaces FSB 234-018 dated 6.2014.
Date
Group
No.
Release
Page
6.2014
234
018
02
1(6)
Single Fuel Tank Ventilation Filter Kit
CHU, CXU, GU, TD
FSB 234-018, Single Fuel Tank Ventilation Filter Kit
(June 2014)
MACK Trucks has introduced a new fuel tank ventilation filter mounting sleeve (part number
21043123) that mounts on the outside of the frame rail using the fuel tank J bracket huck
fasteners. The fuel tank vent filter has been implemented for increased protection against fuel
injector tip erosion. This new sleeve offers simplified servicing of the filter due to the location.
Sleeves (2 per filter) 21043123 should be used in place of the mounting bracket and
hardware in kit 85136403 to mount the filter on the outside of the frame rail next to the
fuel tank.
Note: To ensure the effectiveness of the fuel tank ventilation filter system, the fuel tank
ventilation filter must be changed at the same interval as the engine air filter.
PV729-FSB234-018_M
USA65900
Mack Trucks, Inc.
Field Service Bulletin
Date
6.2014
Group
No.
Release
234
018
02
Required Parts
Note: Due to various tank and deck plate configurations, some routing and clipping hardware
may not be used.
W2081796
1. Bracket Fastener (2) (not needed)
7. Hose Adapter
2. Lock Nut (2) (not needed)
8. Extension Hose
3. Tie Strap Retainer (not needed)
9. Shield (not needed)
4. Tie Strap
10. Filter Housing
5. Existing Fuel Tank Vent Hose
11. Filter Housing Retainers
6. Bracket (not needed)
12. Shield Fastener (4) (not needed)
Page
2(6)
Mack Trucks, Inc.
Field Service Bulletin
Date
6.2014
Group
No.
Release
234
018
02
Procedure
You must read and understand the precautions and guidelines in Service Information,
Function Group 20, “Engine Safety Practices” before performing this procedure. If you are
not properly trained and certified in this procedure, ask your supervisor for training before
you perform it.
DANGER
Do not attempt to repair or service this vehicle without having sufficient training, the correct
service literature and the proper tools. Failure to follow this could make the vehicle unsafe
and lead to serious personal injury or death.
CAUTION
Possible damage to electronic components. Turn the vehicle ignition switch OFF before
disconnecting or connecting any electronic components. Failure to de-energize circuits
may result in permanent damage to electronic components.
Note: Use standard torque values for all fasteners.
1 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
2 Remove components as necessary to access fuel tank J bracket.
3 Locate a suitable mounting location within 1 m (3 ft) of the fuel tank vent. Install the
mounting sleeves (part number 21043123) on the J bracket huck fasteners.
W2091647
Page
3(6)
Mack Trucks, Inc.
Field Service Bulletin
Date
6.2014
Group
No.
Release
234
018
02
4 Install the filter on the mounting sleeves.
W2091644
5 Install the hose adapter in the end of the existing fuel tank vent hose. Cut the appropriate
length of extension hose. Connect extension hose to adapter and fuel vent filter. Install tie
strap in tie strap retainer and secure extension hose with tie strap.
Note: Do not leave any low areas or dips in the vent hose although it can be routed in an
upward manner initially and then downward to the filter as long as no dips are left in
between.
6 Cut approximately 10 cm (4 in) of hose and connect to bottom of fuel vent filter housing.
7 Install components removed to access fuel tank J bracket.
Page
4(6)
Mack Trucks, Inc.
Field Service Bulletin
Date
6.2014
Group
No.
Release
234
018
02
8 Install replacement engine fuel filter, part number 21763342.
W2069497
9 Identify a suitable location on the air filter housing and install the fuel tank ventilation filter
label, part number 21807860.
W2081800
10 Reconnect all previously removed cables to the negative (ground) battery terminals and
remove wheel chocks.
Page
5(6)
Mack Trucks, Inc.
Field Service Bulletin
Date
6.2014
Group
No.
Release
234
018
02
Page
6(6)
Reimbursement
This repair may be eligible for reimbursement if a product failure was
experienced within time and mileage limits of the applicable Warranty
coverage. Reimbursement is obtained via the normal claim handling
process.
Reimbursement
UCHP
Reimbursement
eWarranty
Claim Type (used only when uploading from the Dealer Bus. Sys.)
01
01
Primary Labor Code
2341–03–09–01 —
0.3 hrs.
2314G-01-80 — 0.3
hrs.
Causal Part
40QE2187
40QE2187
Labor Code
MACK Trucks reserves the right to make any changes in design or to make additions to or
upon its products without incurring any obligations to install the same on vehicles previously
built.