NHTSA ID Number: 10177608
Manufacturer Communication Number: TS1033014
TSB/Document Date: 2020-07-31
Summary
Training Solutions for Fuel Leak Found at High Pressure Fuel Pump Weep Hole for Heavy Duty DD Engines. Occasionally we see trucks come in with fuel leaking from the high pressure fuel pump weep hole. This is NOT a defect in the pump and further diagnostics need to be performed to find the root cause.
TS 1033014 Fuel Leak Found at High
Pressure Fuel Pump Weep Hole for Heavy
Duty DD Engines
Summary: Occasionally we see trucks come in with fuel leaking from the high
pressure fuel pump weep hole. This is NOT a defect in the pump and further
diagnostics need to be performed to find the root cause.
Generally the unit will come in with a complaint of a
fuel leak at the fuel pump. You may also have fault
codes for fuel filter replacement (94/15 and or 94/16).
Check to see if fuel is leaking from the weep hole underneath the high pressure fuel pump. (As shown to
the right)
The fuel lip seal in the high pressure pump
can fail when low side fuel pressures are extremely high. High fuel pressure is caused
from a restriction on the return side of the
fuel system.
1
TS 1033014 Fuel Leak Found at High Pressure Fuel Pump Weep Hole for Heavy Duty DD Engines
Visually inspect the OEM return fuel lines from the
fuel filter module back to the tanks. Look for any severe bends or kinks in the line. The photo to the right
shows where the return fuel line was kinked when
it was connected to a fuel cooler. Make any repairs
needed.
The high pressure fuel pump will need to be
replaced as the seal is not serviceable. After
the pump has been replaced run the engine at idle and check fuel pressure with a mechanical gauge. Avoid running the engine at
a higher rpm so the new pump seal isn't damaged in case the restriction is still present.
https://extranet-ddc.freightliner.com/
power_service/literature/Index/PSLindex.asp
GHG17 workshop manual section 9.1.3
EPA 07/10/GHG14 fuel system manual section 2.1.4 two filter
EPA 07/10/GHG14 Fuel system manual section 3.1.4 three filter
Refer to PSL for normal fuel system pressures.
If fuel pressure is higher than spec you will
need to find the source of the restriction.
Possible cause outside of the OEM fuel system are:
-Two stage valve stuck closed
- Plugged high pressure fuel flange
2
TS 1033014 Fuel Leak Found at High Pressure Fuel Pump Weep Hole for Heavy Duty DD Engines
Once fuel pressures are within the normal
range and the pump has been replaced the
unit can be released. Make sure any warranty claims are filed correctly depending on
the primary failed part.
3
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TSB/Document ID: TS1033014
Replacement Service Bulletin Number:
MFR Communication Date: 2017-03-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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