Field Service Bulletin

FSB.0003 Ver 1.0

August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
Affected
Vehicles

QTY: 800 MY2019 Ford F-59 CNG package vans
 UPS Job # 20-26 P80 / UPS Job # 20-27 P100 / UPS Job # 20-28 P120
 UPS Package Car Ranges: 170855 – 170984
199419 – 199768
834055 – 834162
834579 – 834790

Introduction
Agility Fuel Solutions LLC, a subsidiary of Hexagon Agility Inc. (Hexagon Agility®), has redesigned the CNG
high-pressure (HP) fuel filter bowl to incorporate a bleed valve to facilitate fuel system depressurization.
RECOMMENDED: Install this retrofit kit at the regular HP fuel filter element replacement interval.
Hexagon Agility® has created this informational and instructional document for retrofit kit installation.
Warning Statements Used in this Bulletin
WARNING indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
NOTICE is used to address practices not related to physical injury, such as best
practices or tips to help an operation or procedure go smoothly and prevent
equipment damage.
CRITICAL CHARACTERISTIC – Product feature directly affects:
 Safety of vehicle users, people nearby and maintenance personnel, or
 Regulatory compliance.
MANUFACTURING CHARACTERISTIC –
 A product feature solely used to improve manufacturability or maintain process
control.
 A process parameter or step that has a significant effect on achieving a Critical
Characteristic or Significant Characteristic, or maintaining material identification/
traceability.

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

1 of 15

Required Tools and Materials
Item

Purpose

safety glasses
7/16-in wrench
11/16-in wrenches (QTY: 2)
11/16-in crowfoot wrench
55 mm crowfoot wrench
torque wrench
11/16-in crowfoot wrench
Swagelok® Snoop® leak detection fluid
Torque Seal (any color but yellow)
shop rags
O-ring lubricant
1/4-in allen wrench

eye protection
tighten bleed valve pressure relief nut
remove and install fuel system fasteners and fittings
torque bleed valve
remove and install HP fuel filter bowl
accurately tighten fuel system fittings, fasteners, and components
use with torque wrench to tighten bleed valve
perform leak test
indicate fittings and fasteners are tightened to specifications
clean fuel system components before and after repair
lubricate O-ring for proper seating, seal, and protection
remove high-pressure filter drain plug

Supplied Components and Required Parts
Part Number

69000538

Description

QTY

Kit, filter, bowl, CNG, HP fuel, bleed valve

O-ring, fuel filter bowl

1

decal, fuel filter

HP fuel filter bowl

Kit, service, filter element (Hexagon
Agility® p/n 69000481) is a regular
maintenance item required for this
installation and is not included in
the retrofit kit.
cap, pressure relief port
bleed valve

bleed valve assembly

cap, pressure relief nut
If any parts are missing or unusable, contact Hexagon Agility® Customer Care
and Technical Services (CCTS) for replacement.
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

2 of 15

Warranty Information
This procedure is covered under the provisions of the fuel system warranty.

1. Vehicle Preparation
Set emergency brake and place wheel chocks in front of and behind tires.
Wear approved personal protective equipment (PPE) including safety glasses.

2. Depressurization Procedure
Fuel lines must be depressurized before servicing fuel system components.
Vehicle will be immobile after depressurization; plan accordingly.
1. Close driver side (DS) cylinder manual valve (1). FIGURE 2–1
FRONT

3

2

1

FIGURE 2–1. (1) DS manual cylinder valve, (2) PS manual cylinder valve, (3) 1/4-turn manual shutoff valve

2.
3.
4.
5.

Close passenger side manual valve (2). FIGURE 2–1
Close 1/4-turn manual shutoff valve (3). FIGURE 2–1
Start engine and idle until engine stalls.
Attempt to start engine again.
a. If engine starts, allow engine to idle until it stalls.
b. Repeat Step 5 until engine fails to start.

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

3 of 15

Step 6 must be performed slowly and incrementally to abrade the HP fuel filter
drain plug O-ring to allow a safe and gradual release of fuel pressure. Do not
completely remove drain plug at this time; retighten and loosen plug as
directed until the sound of escaping fuel is audible.
6. Purge remaining fuel pressure by using a 1/4-in Allen wrench to slowly loosen (4) high-pressure (HP) fuel
filter (5) drain plug 1/2-turn to 3/4-turn and retighten drain plug. Repeat loosen-tighten sequence until sound
of escaping fuel is heard. FIGURE 2–2

FRONT

4

DO NOT remove (5) HP fuel filter drain plug until fuel pressure has
been released following multiple loosen and tighten sequences.

5

HP fuel filter bowl may contain fluid. Collect fluid in a container and dispose of
fluid in compliance with authority having jurisdiction (AHJ) or organizational
guidelines.
FIGURE 2–2. (4) HP fuel filter assembly, (5) drain plug

7. Remove (5) HP fuel filter drain plug and allow any remaining fuel pressure to escape from (4) HP fuel filter
assembly before proceeding to retrofit kit installation. FIGURE 2–3
FRONT

4

5

Once removed, drain plug has no sealing ability and cannot be safely reused.
Recycle or discard (5) drain plug in compliance with AHJ or organizational
guidelines.
FIGURE 2–3. (4) HP fuel filter assembly, (5) drain plug (removed)
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

4 of 15

3. Installation Procedure
NEVER put a wrench on a fuel system fitting without first confirming the
system has been depressurized.
1. If present: remove existing (d) decal from (3) HP fuel filter head. FIGURE 3–1
FRONT

d
2

3

FIGURE 3–1. (2) high-pressure (HP) fuel filter assembly, (3) HP fuel filter head, (d) decal

2. Clean (2) HP fuel filter assembly thoroughly and use a 55 mm wrench to remove (1) filter bowl from (3) HP
fuel filter head. FIGURE 3–2

FRONT

3

2

1

NOTE: (1) filter bowl will not be
reused; recycle or discard.

Recycle or discard (1) old HP fuel filter bowl in compliance with AHJ or
organizational guidelines.
FIGURE 3–2. (2) HP fuel filter assembly, (3) HP fuel filter head, (1) filter bowl
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

5 of 15

3. Remove (4) filter element from (3) HP fuel filter head. FIGURE 3–3
FRONT

3

4

Discard used filter element in compliance with AHJ or organizational guidelines.
FIGURE 3–3. (3) HP fuel filter head, (4) filter element

4. Inspect (s) filter element stem inside (3) HP fuel filter head. FIGURE 3–4
(s) filter element stem is an integral part of the (3) HP fuel filter head. If (s) stem is
damaged or missing, obtain new HP fuel filter assembly, from Hexagon Agility®
CCTS. FIGURE 3–4

3

FRONT

s
t
FIGURE 3–4. (3) HP fuel filter head, (s) filter element stem, (t) thread location

5. Clean and inspect (3) HP fuel filter head threads (not visible) at location (t) for debris, cross-threading, burrs,
etc. If HP fuel filter head threads are damaged, obtain replacement HP fuel filter assembly from Hexagon
Agility® CCTS.
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

6 of 15

6. Install retrofit kit (o) O-ring, in (5) retrofit kit HP fuel filter bowl (g) groove. FIGURE 3–5
Apply a light coat of O-ring lube to (o) O-ring before installing.
o
g

5

FIGURE 3–5. (5) HP fuel filter bowl, (o) O-ring, (g) groove

7. Install new (4) filter element (Hexagon Agility® p/n 69000481—kit available separately) in (3) HP fuel filter
head. FIGURE 3–6
FRONT

3
4

FIGURE 3–6. (3) HP fuel filter head, (4) filter element

8. Use a 55 mm wrench to install (5) retrofit HP fuel filter bowl on (3) HP fuel filter head. FIGURE 3–7
Torque (5) filter bowl to 60 ft-lbs (81.3 Nm).

FRONT
5

3

FIGURE 3–7. (5) retrofit HP fuel filter bowl, (3) HP fuel filter head
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

7 of 15

9. Clean (3) HP fuel filter head and (5) fuel filter bowl for decal installation. FIGURE 3–8
FRONT
p

6

3

5

8
FIGURE 3–8. (3) HP fuel filter head, (5) retrofit HP fuel filter bowl, (8) bleed valve, (6) filter decal, (p) outlet port

10.

Install (6) fuel filter decal on (1) HP fuel filter head with flow arrow pointing towards the fuel filter head
(p) outlet port. FIGURE 3–8

11. Remove pressure relief port cap and pressure relief nut cap from (8) bleed valve. FIGURE 3–9
7
pressure relief port cap

8

v

pressure relief nut cap

FIGURE 3–9. (5) retrofit HP fuel filter bowl, (8) bleed valve, (v) pressure relief port, pressure relief port cap, pressure relief
nut cap

12. Verify pressure relief nut is fully closed using a 7/16-in wrench. FIGURE 3–10
To increase service life, ensure proper valve performance, and prevent leakage, apply only
®
enough torque to pressure relief nut as required to achieve positive shutoff per Swagelok
instructions.
8
FRONT
pressure relief nut
FIGURE 3–10. (8) bleed valve, pressure relief nut
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

8 of 15

4. Leak Test Procedure
1. With an assistant, open DS cylinder manual valve while observing HP gauge on fuel fill panel until it reads
500 psi (3.45 MPa) and close the manual cylinder valve. FIGURE 4–1
9

FRONT

1
4
5

FIGURE 4–1. Fuel fill panel, (9) HP gauge reading 500 psi, (4) 1/4-turn manual shutoff valve, (5) DS cylinder manual valve

2. Open 1/4-turn manual shutoff valve. FIGURE 4–1
3. Listen for hissing as a sign of a system leak.
STOP fuel flow immediately if loud hissing indicative of a fuel leak is audible.
4. Apply Swagelok® Snoop® leak detection solution to HP fuel filter bowl-filter head junction, all HP fuel filter
fittings and the bowl to bleed valve interface, and pressure relief ports and wait 3 minutes. FIGURE 4–2
HP fuel filter fittings

HP fuel filter bowlfilter head junction
4
filter bowl to bleed valve interface

9

pressure relief port

FIGURE 4–2. Apply Swagelok® Snoop® to (4) HP fuel filter assembly and (8) bleed valve at locations circled

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

9 of 15

5. Inspect all HP fuel filter fitting and component junctions for bubbles as an indicator of a leak. FIGURE 4–3

bubble formation indicative
of a fitting leak

Swagelok® Snoop® bottle

FIGURE 4–3. Swagelok® Snoop®, bubbles forming at a fitting junction

a. If no leaks are found, proceed to next step.
b. If leaks are found, purge fuel from the vehicle using the procedure described above in Section 1, Steps
1 through 5.
c. Use a 7/16-in wrench to slowly loosen the pressure relief nut. FIGURE 4–4
To increase service life, ensure proper valve performance, and prevent leakage, apply only
®
enough torque to pressure relief nut as required to achieve positive shutoff per Swagelok
instructions.
FRONT
8
pressure relief nut

FIGURE 4–4. (8) bleed valve, pressure relief nut

d. Tighten the pressure relief nut to finger tight then use a 7/16-in wrench to apply just enough pressure
to stop the flow of fuel. FIGURE 4–4
NEVER attempt to tighten fittings while system is pressurized.
e. Repair leak(s) before repeating Leak Test Procedure. Refer to ENP-516, Truck and Tractor CNG Fuel
System Operation, Maintenance & Inspection Manual, “Leak Repair” section.

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

10 of 15

6. With an assistant, open DS cylinder manual valve while observing HP gauge on fuel fill panel until it reads
1800 psi (12.4 MPa) and close the manual cylinder valve. FIGURE 4–5
FRONT

9

1
4
5

If less than 1800 psi of fuel is onboard, refuel system to 1800 psi. Refer to ENP-516,
Truck and Tractor CNG Fuel System Operation, Maintenance & Inspection Manual,
“CNG System Fueling” section.
FIGURE 4–5. Fuel fill panel, (9) HP gauge reading 1800 psi, (4) 1/4-turn manual shutoff valve, (5) DS cylinder manual valve

7. Repeat Steps 4 through 5 until no leaks are present, then proceed to Step 8.
8. With an assistant, open DS cylinder manual valve while observing HP gauge on fuel fill panel until it reads
3600 psi (24.6 MPa) and close the manual cylinder valve. FIGURE 4–6
9

FRONT

1
4
5
If less than 3600 psi of fuel is onboard, refuel system to 3600 psi. Refer to ENP-516,
Truck and Tractor CNG Fuel System Operation, Maintenance & Inspection Manual,
“CNG System Fueling” section.
FIGURE 4–6. Fuel fill panel, (9) HP gauge reading 3600 psi, (4) 1/4-turn manual shutoff valve, (5) DS cylinder manual valve

9. Repeat Steps 4 through 5 until no leaks are present, then proceed to Step 10.
10. When the system passes the 3600 psi (24.6 MPa) leak test, use shop rags to clean all Swagelok® Snoop®
from fuel system components.
FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

11 of 15

11. Use a Torque Seal marker (any color but yellow) to mark properly tightened fuel system fittings and the bleed
valve pressure relief nut. FIGURE 4–7

Torque Seal

pressure relief nut

FIGURE 4–7. (8) bleed valve, pressure relief nut, fitting junction marked with Torque Seal

12. Install pressure relief port cap, p/n 61090128, and bleed valve cap, p/n 61090129, on (v) pressure relief port
and (8) bleed valve pressure relief nut. FIGURE 4–8
7
pressure relief port cap

8

v

pressure relief nut cap

Obtain replacements from Hexagon Agility® CCTS if either cap is missing.
FIGURE 4–8. (5) retrofit HP fuel filter bowl, (8) bleed valve, (v) pressure relief port, pressure relief port cap, pressure relief
nut cap

13. Road test vehicle using the procedure described below.

5. Road Test Procedure
1.
2.
3.
4.
5.
6.
7.

Verify 1/4-turn manual shutoff valve, DS manual cylinder valve, and PS manual cylinder valve, are open.
Remove wheel chocks from front and rear of tires.
Start engine and verify proper fuel system operation.
Road test the vehicle until it reaches operating temperature.
If a system fault appears, contact Hexagon Agility® CCTS.
If system is operating properly, release vehicle into service.
Update vehicle maintenance and repair records.

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

12 of 15

Appendix A. WI.0199 – Removal and Retightening of Tube Fittings

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

13 of 15

FSB.0003 Ver 1.0
August 16, 2021

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

14 of 15

Hexagon Agility® Customer Care and Technical Services
Fuel system warranty or non-warranty product support may be obtained by calling or emailing Hexagon Agility® Customer
Care and Technical Services (CCTS).
Please provide your name, phone number, email address, and complete vehicle information: VIN, year, make, model,
mileage, unit number vehicle owner, and current vehicle location. A service advisor will contact you to arrange vehicle
repair or ship a part.

+1 877 234 1722

(toll-free, U.S. and Canada)

UPS Direct Access Prompt: 6

Support

[email protected]

Parts Orders

[email protected]

Proprietary Statement

The information provided within this document is proprietary and confidential. All prior versions, including updates and revisions forwarded separately, are
proprietary. The information provided by Hexagon Agility® to its customers and clients is solely for the use of those customers and clients. No portion of this
publication may be reproduced or distributed without express written consent of Hexagon Agility®. Hexagon Agility® reserves the right to utilize the intellectual
property contained within this publication as content for any other publication produced by Hexagon Agility®.

Trademark Notice

Hexagon® is a registered trademark of Hexagon Technology AS. Agility® is a registered trademark of Agility Fuel Solutions LLC. Trademarks of other
manufacturers are the property of their respective companies.

Hexagon Agility®

FSB.0003 Ver 1.0
August 16, 2021

3335 Susan Street, Suite 100 Costa Mesa, CA 92626 USA

Ford F-59 CNG HP Fuel Filter Bowl & Bleed Valve Retrofit
PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED

www.hexagonagility.com

15 of 15