NHTSA ID Number: 11030946
Manufacturer Communication Number: TSB210203
TSB/Document Date: 2026-04-07
Summary
This Technical Service Bulletin describes the verification and resolution steps for the suction side fuel filter which may experience repeated plugging prior to the required maintenance interval, resulting in fault code 559 (Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level) being set. This is an update to a previously submitted communication.
Technical Service Bulletin
Technical Service Bulletin: TSB210203
Shortened Suction Side Fuel Filter Life: Fault Code 559
Released Date: 10-Mar-2026
Shortened Suction Side Fuel Filter Life: Fault Code 559
Warranty Statement
The information in this document has no effect on present warranty coverage or repair practices, nor does it authorize TRP or Campaign actions.
Contents
Product Affected
B6.7 CM2350 B121B
B6.7 CM2450 B155B
L9
CM2350 L116B
L9 CM2350 L119B
L9 CM2350 L123B
L9 CM2450 L126B
L9 CM2450 L169B
Issue
Symptom:
Repeated plugging of suction side fuel filter prior to required maintenance interval. See corresponding Operation and Maintenance Manual, Bulletin 5613076.
Reference Procedure 359-008 in Section 3 for fuel filter maintenance interval.
Root Cause:
Suction side fuel filter plugging
Verification
Confirm suction side fuel filter is plugged. See corresponding Service Manual. Reference Procedure 006-020 in Section 6 to measure suction side fuel filter
restriction.
Confirm suction side fuel filter is a 10-micron fuel filter. Reference Table 1 for corresponding fuel filter part number.
Confirm pressure side fuel filter restriction is within specification. Perform pressure side fuel filter restriction test. See corresponding Service Manual. Reference
Procedure 005-236 in Section 5 to measure pressure side fuel filter restriction.
Verify that there are no issues related to storage tanks, fuel quality, or the high bio-content in the fuel used by the customer. See corresponding Fluids for
Cummins® Products Service Manual, Bulletin 5411406. Reference Section 1 Diesel Fuel.
One significant concern to the fuel system is corrosion, which can be driven by inadequate daily fuel water separator drain maintenance or prolonged operation with
FC418/FC1852. This risk can be mitigated if the customer adheres to a daily water drain schedule. See corresponding Operation and Maintenance Manual, Bulletin
5613076 Reference Procedure 006-043 in Section 2 Fuel Water Separator.
Resolution
New suction side fuel filter options for units repeatedly experiencing short suction side fuel filter life are available. New filter options offer adequate protection to
the fuel system while extending suction side fuel filter life. See Table 1.
If unit is an International Motors® vehicle, follow iKnow article IK1500093 for better references and recommendations.
Service Instructions
Verify correct pressure side fuel filter is installed. Pressure side fuel filter, Part Number FF63041 NN, must be used when utilizing a new suction side fuel filter. Install the
appropriate 25 or 30 micron Suction Side (Stage 1) fuel filter for the existing filter housing using Table 1.
Service Parts Availability
Table 1, Service Parts
Suction Side Filter Housing
Existing Stage 1 Fuel Filter Part
Number (10um)
New Stage 1 Part Number (25 or
30um)
FS90394
FS90396
5528103
FS19596 - 3954981
FS1003 - 4070601
5682805
FS19732 - 3973233
Racor
Racor
FS20028
R90T
R90P
FS20288
R90T
R90P
Davco
Davco
Davco
DP243
N/A
FS19728
DP245
FS20081
N/A
FS90395
Pressure Side Part Number (no
change)
FF63041 NN
FF63041NN
FF63041 NN
Table 1, Service Parts
Suction Side Filter Housing
Existing Stage 1 Fuel Filter Part
Number (10um)
New Stage 1 Part Number (25 or
30um)
Racor
Racor
Racor
445R
R45T
R45P
460R
R60T
R60P
490R
R90T
R90P
4125R
R125T
R125P
4120R
R120T
R120P
Pressure Side Part Number (no
change)
FF63041 NN
Note : If a part number is not referenced in Table 1, contact local Cummins Inc. representative or OEM for assistance in obtaining correct suction
side fuel filter part number.
Document History
Date
Details
2021-9-17
Module Created
2024-2-29
Updated Table 1.
2024-12-9
Removed PACCAR suction side fuel filter from Table 1 as it was not compatible.
2025-2-6
Updated Product Affected and Table 1.
2025-2-27
Updated Product Affected, Verification, Resolution, and Table 1.
2026-3-9
Updated Table 1.
Last Modified: 10-Mar-2026
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TSB/Document ID: TSB210203
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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