FSB 233-004

Field Service Bulletin
Trucks
Volvo Trucks North America
Greensboro, NC USA
Date
This Field Service Bulletin replaces bulletin, “ Tandem Fuel
Pump Leakage”, PV729–FSB233-004_V (USA50507) dated
(10/2011).
2.2014
Group
No.
Release
233 004 03
Page
1(2)
Tandem Fuel Pump Leakage
VN, VHD, VT, VAH
FSB 233-004, Tandem Fuel Pump Leakage
(February 2014)
The technical material analysis center (TMAC) claim analysis on returned fuel pumps has
shown a number of fuel pumps returned due to a fuel leak that shows no defect in testing.
The D11, D13, and D16 fuel pump is mounted on the back of the power steering pump as a
tandem pump assembly. The shaft seal for the fuel pump and the shaft seal for the power
steering pump, along with the weep hole are all contained within the power steering pump
housing. Replacement of the fuel pump due to a fluid leak at the weep hole will not correct a
weep hole leakage complaint. Refer to the cross sectional diagram in this document for
additional information and views of the seal location.
W2068238
Service personnel: Please circulate, read and initial
Service
Manager
Warranty
Administrator
PV729-FSB233-004_V
Workshop
Foreman
Service Technicians
USA63759
Volvo Trucks North America
Date
2.2014
Group
No.
Release
233
004
03
If a fuel leak is encountered at the fuel pump, identify the source area of the leak and proceed
as follows:
Tandem Fuel Pump Inspection
Fuel Leak Location
Action
Fuel Pump Fittings
Service fittings and sealing washers as necessary.
Fuel Pump Mounting O-ring
Replace fuel pump mounting O-ring
Weep Hole
Replace tandem pump assembly.
W2068239
Cross Sectional View of Tandem Pump Assembly
Item Number
Description
1
Power steering seal and fuel seal both located in power steering pump
2
Drive Coupling
3
Power steering pump
4
Fuel pump mounting O-ring
5
Fuel pump
6
This space filled with fuel under normal operation
7
Weep hole for both power steering fluid and fuel
Page
2(2)