SB-10054426-3111

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SUBJECT

DATE

Diagnostic Tests - Three-Filter Fuel System

September 2013

Additions, Revisions, or Updates
Publication Number / Title

Platform

Section Title

Change

DDC-SVC-MAN-0084

DD Platform

FIS Low Pressure Leak
Test - Three-Filter Fuel
System

Updating test.

All information subject to change without notice.

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2 FIS Low Pressure Leak Test - Three-Filter Fuel System

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FIS Low Pressure Leak Test - Three-Filter Fuel System

Table 1.
Service Tools Used in the Procedure
Tool Number

Tool Description

J-48710

Air Pressure Test Kit, Fuel System

W470589039100

Fuel System Tool Update Kit without
an MCM (Motor Control Module) cooler

Tool Graphic

DDDL 7.09 or newer

Test as follows:
1. With the engine OFF, apply the parking brake, chock the wheels and perform any other applicable safety steps.
2. Remove the fuel tank fill caps.
3. Remove the fuel feed line at the fuel filter module.
WARNING: PRESSURIZED AIR AND FLYING PARTICLES
To avoid injury to eye or face, wear a face shield or goggles when conducting a pressure test.

4. Install J-48710 tool (1) on to the fuel filter module.

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5.
6.
7.
8.

Connect an air supply to J-48710 tool.
Pressurize the fuel system to 345 kPa (50 psi) for six minutes.
Close the ball valve on J-48710 tool.
Remove the return line from the fuel filter module and install J-48710 cap tool (1) on the fuel filter module return line
fitting.

9. Install the fuel tank fill caps.
10. Turn the ignition ON (key ON, engine OFF). Connect to the MCM using DDDL.
11. Click the “service routines” tab in DDDL.

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2 FIS Low Pressure Leak Test - Three-Filter Fuel System

12. Click the “FIS Low Pressure Leak Test” tab in DDDL.

WARNING: PRESSURIZED AIR AND FLYING PARTICLES
To avoid injury to eye or face, wear a face shield or goggles when conducting a pressure test.

13. Using J-48710 tool, pressurize the fuel system to 517 kPa (75 psi) for four minutes.
14. Close the ball valve and disconnect the air supply from J-48710 tool.
NOTE: The fuel compensation pressure will increase after the “Start” button has been pressed.
NOTE: The fuel compensation pressure sensor reads in absolute pressure, therefore the pressure should read
about 100 kPa (14.5 psi) (depending on elevation) more than the fuel pressure gauge on the J-48710 tool. The
fuel compensation sensor will read close to 620 kPa (90 psi) of pressure when the J-48710 tool is reading 517
kPa (75 psi).
15. Press the “Start” button on DDDL.

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16. Once the test is complete, review the DDDL log file test results.
17. Did the fuel system pass the FIS Low Pressure Leak Test?
a. Yes; slowly remove the J-48710 cap tool from the fuel filter module. Remove the J-48710 tool from the fuel filter
module. Install the fuel feed line and return line on to the fuel filter module. Return to the initial diagnostics that
directed you to the FIS Low Pressure Leak Test.
b. No; Go to step 18.
WARNING: PRESSURIZED AIR AND FLYING PARTICLES
To avoid injury to eye or face, wear a face shield or goggles when conducting a pressure test.

18. Connect an air supply to the J-48710 tool.
19. Open the ball valve and pressurize the fuel system to 517 kPa (75 psi).
20. Using a soapy solution, spray connectors, fittings and hoses shown in the "Potential Fuel Leak Points-Three-Filter Fuel
System" procedure. Refer to section "Potential Fuel Leak Points - Three-Filter Fuel System". Was a leak found?
a. Yes; repair as necessary. Repeat the FIS Low Pressure Leak Test to verify the repair.
b. No; contact the Detroit™ Customer Support Center at 800-445-1980.

All information subject to change without notice.

9 03-13

Copyright © 2013 DETROIT DIESEL CORPORATION

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