TIBU-7417

2/6/2014
Advanced Full Text Search - TIBU7417 - AFI Fuel Supply Line Rubbing{1274}
T echnical Information Bulletin
AF I F uel Supply Line Rubbing{1274}
Me dia Num be r -TI B U7417-00
Caterpillar: Confidential Y ellow
P ublicat ion D at e -02/ 01/ 2014
D at e Updat e d -02/ 01/ 2014
SB-10054882-7890
i05615949
AFI Fuel Supply Line Rubbing{1274}
SM CS - 1274
On Highway Truck:
CT660 (S/N: TGA1-UP; TGD1-UP; TEJ 1-UP; TRK1-UP; TKL1-UP; TEM 1-UP; TEP1-UP;
TGS1-UP; TJ S1-UP; TGT1-UP; TSW1-UP; TSY1-UP; TGZ1-UP)
Intr oduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is
known, use the solution that is identified below.
Pr oblem
If the fuel lines are not routed correctly, the AFI Fuel Supply line can rub through from the fuel system return line.
This situation can cause regen issues or an inability to perform regens. When the ECM senses a pressure issue in
the line, the ECM will stop sending fuel to the AFI from the DSI. You will not see a fuel leak in the area. What you
will see is a regen issue and aftertreatment temperatures not reaching the correct temp and eventually the ECM will
abort the OBFCT.
SYMPTOMS
Regen issues
Inability to perform regens
No fuel to the AFI from the DSI
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Advanced Full Text Search - TIBU7417 - AFI Fuel Supply Line Rubbing{1274}
Illustration 1
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Example of an AFI Fuel Supply Line rubbing
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Illustration 2
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Example of an AFI Fuel Supply Line rubbing
Example of a Bad OBFCT with a Hole in the AFI Fuel Supply Line
Notice that the AFT Fuel Doser CTL actuated three times to purge the air. The AFT Fuel Doser CTL went to 0
and AFT Fuel Pressure 2 never climbed off 0 PSI. You will not see any leaks. There is no fuel being sent to
pressurize the line.
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Illustration 3
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Solution
Table 1
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Required Parts
Item
Qty
Part Number
Description
1
1
376-2674
Fuel Tube
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Illustration 4
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(1) 376-2674 Fuel Tube
Inspect and verify that the AFI Fuel Tube (1) is secured to the AFI bracket with the P-Clip. Ensure that the line
separator clip is installed on the return and AFI line. Be sure that the DSI supply line is not rubbing anything. Refer
to Illustration 4.
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View Image
Illustration 5
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Example of a good OBFCT after the AFI Fuel Supply Line was repaired
Notice the AFT Fuel Doser CTL actuated and stayed active and AFT Fuel Pressure 2 is working properly now.
Refer to Illustration 5.
C opyright 1993 - 2014 C ate rpillar Inc.
All R ights R e se rve d.
Private Ne twork For SIS Lice nse e s.
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