NHTSA ID Number: 10161026
Manufacturer Communication Number: PIT5685
Summary
This Preliminary information communicates the location that dealers can find information to remove / delete the rear fuel tank from Chassis Cab trucks with RPO N2N dual fuel tanks.
10 Affected Products
Vehicles
SEOCONTENT-START
Bulletin No.: PIT5685
Published date: 05/17/2019
Preliminary Information
PIT5685 Removal / Deletion of Rear Fuel Tank
Models
Brand: Model: Model Years:
VIN:
from to
Chevrolet Silverado 3500 Chassis Cab 2015 – 2019 All All
All All GMC Sierra 3500 Chassis Cab 2015 – 2019
All All All All
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this
PI.
Involved Region or Country North America Additional Options (RPO) N2N (Dual Fuel Tanks)
A Dealer or Upfitter may be looking for information on removing / deleting the rear
Condition
fuel tank of a chassis cab truck with RPO N2N dual fuel tanks.
Cause Information not readily available in Service Information
(SI.)
Correction:
Reference the latest version of GM Upfitter Integration Bulletin 145. The information can be found
at https://www.gmupfitter.com/ under the “Technical Bulletin” Tab and then “Show all bulletins.”
Version History
Version 1
Modified 05/17/2019 – Created on.
UI Bulletin #145
General Motors
Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 1 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
Subject: Removal/Deletion – Rear Fuel Tank
Models Years
Affected:
2015 – 2019
Models Affected: Chevrolet Silverado/GMC Sierra
3500 HD Chassis Cabs
Origination Date: June 7, 2018
Revision Date: N/A
ADVISORY:
Condition/Concern:
Some vehicle upfits of the Chevrolet Silverado and GMC Sierra 3500HD Chassis Cabs required
the removal/deletion of the rear fuel tank to install upfit equipment. The following will provide
instructions on the removal/addition of the necessary hardware to reconfigure the vehicle’s fuel
system from a dual (N2N) to a single front/side mounted (N2M) fuel tank system. Be advised
that following the fuel system reconfiguration certain modules on the vehicle must be
reprogram for the fuel system components to function properly.
Repair/Recommendation:
Gasoline (L96/LC8) Engine Applications – Rear Fuel Tank Removal (2015-2019MY)
1. Relieve the fuel system pressure.
a. Remove the fuel pump fuse.
b. Loosen the fuel fill cap to relieve the fuel tank vapor pressure.
c. Remove the engine cover, if required.
d. Remove the fuel rail service port cap.
e. Wrap a shop towel around the fuel rail service port and using a small flat-bladed
tool, depress (open) the fuel rail test port valve.
f. Remove the shop towel from around the fuel rail service port, and place in an
approved gasoline container.
g. Install the fuel rail service port cap.
h. Install the engine cover, if required.
i. Tighten the fuel fill cap.
2. Raise the vehicle.
For lifting the vehicle, various lift points are recommended. Before you begin any lifting
procedure, place the vehicle on a clean, hard, level surface. Verify that all the lifting
equipment meets weight standards and is in good working order. Verify that all of the
vehicle loads are equally distributed and secure. If you are only supporting the vehicle at
the frame side rails, verify that the lifting equipment does not put too much stress on, or
weaken, the frame side rails.
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 2 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
3. Drain the fuel tank.
a. Loosen the fuel fill hose clamp (1).
b. Remove the fuel fill hose from the fuel tank.
c. Remove the flame arrester screen from the tank opening, if required.
d. Insert the hose from the pump devise into the fuel tank.
e. Using a hand or air operated pump device, drain as much fuel from the tank as
possible.
4. Remove the fuel tank shield bolts (1) and the fuel tank shield (2).
5. Support the fuel tank with a suitable jack.
6. Remove the fuel tank strap fastener (1).
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 3 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
7. Lower the tank enough to access the fuel pump module.
8. Disconnect the electrical connector (1) and the evaporative emissions lines and the fuel
lines (2). Properly secure the wires as they will no longer be used.
9. Lower the fuel tank.
10. Disconnect the quick connect fittings and remove the fuel lines from the rear fuel tank to
front/side fuel tank.
11. Install evaporative system jumper P/N 25989389
12. Install fuel port cap P/N 23287870 or equivalent cap seal.
Evaporative system jumper
Cap Seal
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 4 June 7, 2018
Diesel Engine Applications – Rear Fuel Tank Removal
2015-2016 Model Years (LML).
1. Drain the fuel tank.
a. Disconnect the negative battery cable.
b. Remove the fuel fill cap.
c. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
d. Insert a hose into the tank.
e. Attach the hose to a hand or air operated pump device.
f. Using a hand or air operated pump drain as much fuel from the tank as possible.
2. Loosen the fuel fill and vent hose clamps (1, 2) at the tank.
3. Remove the fuel fill and vent hose from the tank.
4. Disconnect the sending unit electrical connector
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 5 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
5. Disconnect the fuel feed and return lines (1) from the sending unit.
6. Raise and suitably support the vehicle.
7. Remove the fuel tank shield bolts.
8. Remove the fuel tank shield.
9. Remove the fuel tank strap bolts.
10. Remove the fuel tank straps.
11. Lower the fuel tank.
12. With the aid of an assistant, place the fuel tank in a suitable work area.
13. Cap the fuel lines to prevent possible fuel system contamination.
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 6 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
14. Disconnect the pressure balance pump electrical connector
15. Remove the fuel bundle nuts.
16. Remove the fuel bundle and pressure balance pump.
17. Install a cap seal on the fuel inlet port from rear tank.
Install Cap Seal
(P/N 10380656 or equivalent)
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 7 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
2017-2019 Model Years (L5P).
1. Drain the fuel tank.
a. Disconnect the negative battery cable.
b. Remove the fuel fill cap.
c. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
d. Insert a hose into the tank.
e. Attach the hose to a hand or air operated pump device.
f. Using a hand or air operated pump drain as much fuel from the tank as possible.
2. Raise and support the vehicle
3. Disconnect Fuel Feed Rear Hose (1)
4. Disconnect Electrical Connector (2)
5. Remove Fuel Tank Filler Vent Hose Clamp (3)
6. Remove Fuel Tank Filler Vent Hose (4)
7. Remove Fuel Tank Filler Vent Hose (4) @Retainer (5)
8. Remove Fuel Tank Filler Hose Clamp (6)
9. Remove Fuel Tank Filler Hose (7)
10. Remove [6x] Fuel Tank Shield Auxiliary Bolts (1)
11. Remove Fuel Tank Auxiliary Shield (2)
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 8 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
12. Place a suitable adjustable jack under the fuel tank.
13. Remove the Auxiliary Fuel Tank Strap Bolts (1).
14. Remove the Auxiliary Fuel Tank Straps (2).
15. Remove Auxiliary Fuel Tank(1)
16. Remove the lines (15 & 20) from the rear tank to the front tanks.
UI Bulletin #145
General Motors Upfitter Integration
https://www.gmupfitter.com
Bulletin #145 P a g e | 9 June 7, 2018
Disclaimer: GM Upfitter Integration Technical Bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service and/or modification of a vehicle. These properly trained technicians
have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. Contact GM Upfitter Integration for information on whether the information is applicable your vehicle.
17. Cap the fuel inlet port which the fuel line from the rear tank was connected with a
suitable cap and clamp.
Additional Information:
Upon completion of the fuel system hardware reconfiguration, it is necessary to reprogram the
vehicle’s Engine Control Module (ECM) by a GM dealer to enable proper fuel gauge operation
and level indication.
GM DEALERS:
Contact Techline Customer Support and request the vehicle configuration string be modified,
replacing the dual fuel tank option (N2N) with the single front/side fuel tank option (N2M). Be
sure to check for and clear any DTCs that may be present following the vehicle reconfiguration.
FOR TCSC USE:
Install Cap Seal
(or equivalent)
1 – Requires Duramax 6.6L Turbo-Diesel Engine
SEOCONTENT-END
Bulletin No.: PIT5685
Published date: 05/17/2019
To View or Download this Document Click Here
GM Uptter Integration Bulletin 145
- TEMPORARY FUEL SUPPLY FOR ENGINES: This auxiliary fuel tank provides a convenient temporary fuel source when the original fuel tank is removed, disconnected, or difficult to access. Suitable for carbureted motorcycles, bikes, cars, ATVs, generators, small engines, machinery, and other compatible equipment.
- COMPACT GRAVITY-FED DESIGN: The 300 ml auxiliary fuel reservoir delivers a steady gravity-fed fuel supply through the flexible hose, making it useful for engine testing, diagnostics, tuning, fuel-system servicing, and workshop maintenance without installing a full-size fuel tank.
- CONTROLLED FUEL FLOW: An in-line shut-off valve lets you start, stop, or restrict fuel flow directly from the auxiliary tank. This provides convenient control during carburetor adjustments, engine testing, fuel-line checks, leak diagnosis, and other maintenance procedures.
- FLEXIBLE WORKSHOP SETUP: Includes a flexible rubber hose and nylon hanging strap for positioning the reservoir above the engine or fuel inlet. The compact design helps keep the work area clear and allows convenient access in engine bays, workshops, garages, and service areas.
- 300 ML CAPACITY WITH VISIBLE MARKINGS: The compact 300 ml reservoir features graduated markings for easy fuel-level monitoring and quantity measurement. Ideal for focused testing, tuning, diagnostics, break-in procedures, and servicing of compatible carbureted engines and equipment.
- Auxiliary Fuel Tank Workshop Tool Balancing Carbs Carburettor, Motorbike Auxiliary Fuel / Petrol Tanka Must Have Tool For Diy Servicing, Tuning, Carburettor Balancing Etc For Use On Motorcycles, Cars, Trucks, Boats, Tractors, Farm Machinery, Plant Equipment, Etcideal For Motorcycle Servicing As Fuel Tank Must Be Removed To Access The Top Of Engine & Carburettorspecification Tank Capacity: 300Ml Embossed Fuel Increment Measuring Lines On / Off Fuel Tap Handy Handlebar Strap Brand: Alchemy Parts &
- RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
- Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
- Package Dimensions: 57.0 " L x 18.0 " W x 16.0 " H
- Package Weight: 43.545 kilograms
- 【Easy to Connect】Secure gas tank with hose fits 1/4" interface. This structured design allows for easier connection to your motorcycle. The motorcycle fuel tank can also be used for refilling transmission oil on some late-model motocross bikes.
- 【Widely used】fuel tank for use with fuel-injected models with external fuel pumps as well as standard carburetor-equipped motorcycles. Can be used on Mowers, bikes, and cars.
- 【Control Flow Rate】Fuel tank has an upgrade cut-off valve for easier opening and closing to control the flow. This Auxiliary Fuel Tank has an air outlet in the lid for smoother fuel flow. Aux fuel tank can hold up to 1L or 1/4 gallon of fluid.
- 【Synchronizing Carburetors】Auxiliary fuel tank for DIY servicing, tuning, carburetor balancing, etc for use on motorcycles, and cars, ideal for motorcycle servicing as the fuel tank must be removed to access the top of the engine & carburetor.
- 【Handy to Use】Hang the plastic fuel tank over the engine. Hook the hose to the carburetor and you can finish your work. The graduated scale on side of the bottle provides an accurate measurement of fluid volume.
- 【Essential Tool for Small Engine Work and Carburetor Tuning】 The Motorcycle Auxiliary Fuel Tank (500ml with Vent) is an indispensable tool for small engine work and carburetor tuning. It enables the testing of engines before final assembly and offers a convenient solution for precise carburetor adjustments.
- 【Versatile Usage and Precise Control】 With its ability to bypass the tank and deliver clean fuel directly to the carburetor, this auxiliary tank is a valuable tool for working on motors. It enables accurate carburetor adjustments and tuning, thanks to the valve and scale lines that allow you to control the flow of fuel.
- 【Convenient and Safe Design】 This auxiliary tank is designed for easy access and control during engine work, allowing you to securely hang it on the handlebar or bench vice. By using this tank, you can eliminate the risk of accidentally dropping your main fuel tank, creating a safer working environment. Additionally, the fuel tank is equipped with an air inlet on the cap to ensure balanced internal and external air pressure for reliable and smooth gasoline flow.
- 【Durable and Reliable Garage Tool】 Crafted from high-quality materials, this auxiliary tank is durable and reliable. It serves as an essential tool for maintenance and repairs, making it a dependable choice for garage use. Its durability ensures long-lasting performance and reliable fuel delivery.
- 【Note】Before adding fuel to the auxiliary fuel tank, please ensure to follow these precautions: 1.Verify valve closure: Double-check that the fuel valve is tightly closed before adding fuel. This prevents any fuel from flowing out or leaking during the refueling process. 2. Check connection clamps: Inspect all connection points between the auxiliary fuel tank and the equipment. Ensure that any clamps or fasteners are securely tightened to prevent fuel leaks or disconnections while adding fuel. 3.Any problem please contact us, we will give you a satisfactory solution!
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