SAV.1E.2012MA

BS4275E

SERVICE BULLETIN
REFERENCE:

Nova Bus Manuals

SECTION:

11: Fuel Lines

RS NO:

N/A

EFFECTIVE IN PROD.:

LB22 (2018FE)

SUBJECT:

CNG fuel filter hose

JUSTIFICATION:

Fitting on fuel filter hose is incompatible with the fitting on the side of the engine.

APPLICATION DEADLINE: 2019NO30
CLAIM REFERENCE NUMBER: WB-4275

DIRECT CHARGES

LEVEL

DESCRIPTION

1

Replace the fuel filter hose with the one having the correct fitting type.

2

–

TIME

LABOUR

MATERIAL

Nova Bus

Nova Bus

20
min

–

–

–

MATERIAL
QTY

PART NO

REV.

DESCRIPTION

REPLACES PART N°

LEVEL 1

1

N95839-01

–

Hose CNG eng low pressure 25.5 in

–

–

N72334

LEVEL 2

–

–

–

Materials will be available within 27 days once your order has been placed. To order, please contact Prevost Parts by phone
at 1‑800‑771‑6682, by fax at 1‑888‑668‑2555 or by email at prevostparts.commandes@volvo.com. Specify document number,
quantity of parts required and shipping address.

DISPOSAL OF PARTS
REMOVED PARTS ARE:

DISCARDED

RETAINED *

–

Yes

* To be reimbursed, the parts must be retained and returned in
accordance with the usual warranty procedure.

REVISION HISTORY
REV.

DATE

NR

2018SE26

CHANGE DESCRIPTION

Initial release

APPROVED BY: Daniel Theriault

WRITTEN BY

André Pelletier

Digitally signed by Daniel Theriault
DN: cn=Daniel Theriault, o=Nova Bus, ou, email=daniel.theriault@volvo.com, c=CA
Date: 2018.09.26 14:16:02 -04'00'

PAGE 1 OF 6

SERVICE BULLETIN
CLIENT

ORDER

ROAD NUMBER

SAV.1E.2012MA

BS4275E

VIN (2NVY/4RKY...)

QTY

FROM

TO

FROM

TO

L82AXD3000926

L82A1D3000927

2

Calgary Transit - Alberta

L733

8201

8202

Hamilton - Ontario

L885

1501

1524

L82K3F4501093

L82K0F4501214

24

Hamilton - Ontario

L956

1601

1632

L82K2G9775325

L82K3G9775415

32

Hamilton - Ontario

LA05

1633

1643

L82K4G9775553

L82K7G9775577

11

Hamilton - Ontario

LA63

1701

1705

L82K5J9776430

L82K2J9776434

5

Hamilton - Ontario

LA63

1706

1719

L82K2J9776448

L82K5J9776461

14

Hamilton - Ontario

LA63

1801

1811

L82K4J9776435

L82K0J9776447

11

NFTA - Buffalo, New York

L877

1501

1501

L82K0F4500984

L82K0F4500984

1

NFTA - Buffalo, New York

L897

1502

1520

L82K1F4501223

L82K1G9775008

19

NFTA - Buffalo, New York

L947

1601

1624

L82KXG9775248

L82K3G9775320

24

NFTA - Buffalo, New York

LA24

1701

1716

L82K3H9775822

L82K5H9775837

16

Red Deer - Alberta

L960

10021

10025

L82K9G9775418

L82K3G9775429

5

Red Deer - Alberta

L924

10104

10147

L82K0G9775517

L82KXG9775542

12

San Antonio Texas

L990

-

-

L82K5G9775464

L82K5G9775464

1

San Antonio Texas

LA10

422

446

L82K9G9775628

L82K8G9775653

25

San Antonio Texas

LA22

447

555

L82K8H9775654

L82K0H9775762

109

San Antonio Texas

LA34

556

580

L82K0H9775857

L82K8H9775881

25

San Antonio Texas

LA35

581

691

L82KXH9775882

L82K8H9775993

111

PAGE 2 OF 6

SERVICE BULLETIN

SAV.1E.2012MA

BS4275E

WARNING

Follow your internal safety procedures. CNG systems should be maintained and inspected, per the applicable
codes, by trained, qualified, and/or certified personnel.
As with all pressure vessels, CNG storage and fuel delivery systems are dangerous and should be treated
as such. Personnel involved in CNG fuel system maintenance, emergency response, servicing, testing or
inspecting must be properly trained, qualified, and/or certified as required by federal, state/provincial, and
municipal regulations.

WARNING

CNG systems should be maintained and inspected exclusively by trained personnel with certifications in
accordance with the applicable codes. As with all pressure vessels, CNG storage and fuel delivery systems
are inherently dangerous and should be treated as such. Individuals involved in any aspect of CNG fuel
system maintenance, emergency response, servicing, or testing must be properly trained and certified.
Individuals who are not trained and certified in all aspects concerning CNG fuel delivery systems are not
permitted to service, maintain, test, or inspect a system in any way.
Protective footwear and eyewear should be worn by all personnel in close proximity to a CNG system.
When locating the source of a leak only, use certified leak detecting solutions and equipment such as FBI®,
combustible gas detector, Swagelok Snoop®, Hoke Leak Detective®. Any other product or solutions are
unacceptable.
Only use tools that are in good working order with proper calibration.
Wear appropriate attire while servicing or maintaining any CNG system.
Do not start the engine if a natural gas leak is detected.
CNG storage pressure can be as high as 4,250 psi (29,303 kPa).

PAGE 3 OF 6

SERVICE BULLETIN

SAV.1E.2012MA

BS4275E

PROCEDURE
1.1.

Make sure that the vehicle is turned off.

1.2.

Turn the manual shut off-valve on the FMM to the off position. See Figure 1.

Figure 1 - Shut-off Valve on the FMM

PAGE 4 OF 6

SERVICE BULLETIN
1.3.

SAV.1E.2012MA

BS4275E

Start the engine from the engine compartment and run until it stops due to fuel starvation. Low pressure
gauge on the FMM should read zero.

WARNING

Never attempt to depressurize or vent a system by loosening a fitting.

1.4.

Once the pressure has been removed, the filter housing may be drained by turning the drain cock counterclockwise until it stops, or liquid begins draining. Once liquid has ceased to drain, turn the drain cock clockwise
until fully seated hand tight See Figure 2.

Hose to replace

Filter drain cock

Figure 2 - Filter And Hose Location

PAGE 5 OF 6

SERVICE BULLETIN
1.5.

SAV.1E.2012MA

BS4275E

To replace the hose between the filter and the engine, shown in Figure 2, it is recommended to get access
by the engine trap from the inside of the vehicle.
WARNING

Do not disassemble new fittings prior to use.
Do not attempt to torque fittings while system is pressurized.
1.6.

Replace the hose and torque both ends to 60 ± 3 lb-ft (81 ±4 N•m) while holding the fitting body securely.

1.7.

Turn the manual shut off-valve on the FMM to the on position. See Figure 1.

1.8.

Apply a certified leak detecting solution and look for bubbling or foaming at the site of a potential leak.

1.9.

Return the vehicle in service.

PAGE 6 OF 6