Why are there two gas tanks in my GMC 3500?

Why are there two gas tanks in my GMC 3500?

Gmc Two Gas Tanks Why No Selector Switch. Hows It Work? My 02 GMC 3500 Dump fuel gauge is broken. The gas gauge shows E and the fuel message board says low fuel. It has two gas tanks but no selector switch, and it seems to pull gas from both sending units at the same time, while keeping track of the total fuel amount.

Why does my gas gauge not work on my GMC Truck?

Trucks of that “era” had a problem with the gauge cluster that would make the fuel gauge (and/or other gauges) not work. Quick google search says that onboard computer monitors the fuel level in both tanks and averages the fuel remaining to show on your gauge.

What was the problem with my GMC pickup truck?

Specifically, the lawsuit claimed the active fuel management (AFM) system, piston rings and PVC system in these vehicles were faulty and caused excessive oil consumption, as well as premature spark plug degradation and engine malfunction.

Why does my GMC pickup truck use so much oil?

The AFM system, which disables some of the engine’s cylinders at lower RPMs to reduce fuel use, is the most common cause of this issue. While the system accomplishes this, it also leads to oil use problems. Some drivers have reported using as much as a quart of oil every 1,000 miles.

Gmc Two Gas Tanks Why No Selector Switch. Hows It Work? My 02 GMC 3500 Dump fuel gauge is broken. The gas gauge shows E and the fuel message board says low fuel. It has two gas tanks but no selector switch, and it seems to pull gas from both sending units at the same time, while keeping track of the total fuel amount.

Trucks of that “era” had a problem with the gauge cluster that would make the fuel gauge (and/or other gauges) not work. Quick google search says that onboard computer monitors the fuel level in both tanks and averages the fuel remaining to show on your gauge.

Can a Chevy 3500HD run with a full tank?

Both tanks fulled, go down the road for 150 or so miles. get two notches on fuel gage below a half tank marking, and the engine shuts down with a full tank in the rear and nothing in the front. Rear tank doesn’t supply the front as it’s always full.

What kind of fuel pump does Chevy 3500HD have?

THe rear tank has only a two conductor wire connector going to it which is prob the sensor circuit only, and that rear tank does seem to feed thru a remote frame rail rmounted pump to supply the fwd tank. That fwd tank has a 4 wire connector I assume to power both the in tank fuel pump/sending unit combo.

Can a GM Truck have two fuel tanks?

Yes, each tank has its own filler. Oddly there is only a single fuel guage that seems to report the total fuel of the two tanks combined. For instance, if I were to fill one tank and leave the other empty, the guage would read about half full.

Where is the dual tank balance module located?

This module is located by the front (main) lift pump. Slightly toward the rear of vehicle along the frame rail. On top of this module is a fuel pump balance relay, it turns the rear pump on as needed to transfer fuel. At the module, you have a harness with 6 wires. Unplug it and check the following with a digital volt/ohm meter

What kind of truck has dual fuel tanks?

The work truck I’m issued is a 2015 3500 chassis cab with the dual tanks. I had the same problem twice with the fuel guage dropping to E and the truck only pulling from the front tank.

How big is the fuel tank on a Chevy 3500?

Click to expand… 2019 3500 pickups have 36 gal tanks. I was just reading the new GM TECHLINK newsletter. It has an article concerning the 15-19 trucks with dual tanks. Has to do with dirt on top of the rear tank blocking the tank vent fitting.

Where does fuel go in a Duramax 3500HD?

I just got a 2015 HD3500 cab Chassis and while driving it yesterday with the fuel gage showing a quarter of a tank the low fuel light came one and the gage dropped to empty. Also the check engine light came on. I put fuel in the rear tank and then today put fuel in the front tank but was able to get just a little in.

How to troubleshoot no power at the factory plug?

Next, test the pins on the connector where the wiring harness plugs into the truck using a circuit tester like Item # 40376. This will tell you if the problem is on the wiring harness or somewhere deeper in the truck’s wiring. If everything checks out with the pins then the problem is on the harness and it can be replaced with Item # 30955.

What to do if your Chevy Silverado loses power?

While generally the Chevy Silverado is a premium, reliable truck, there are times when even the best vehicles can end up having problems. If you’ve ever had your Chevy Silverado or GMC Sierra suddenly lose power, you may be wondering exactly what is going on with your truck.

What to do if your ECM power relay is failing?

For this reason, if you suspect that your ECM power relay may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the relay should be replaced. The most popular service booked by readers of this article is Vehicle Engine Electrical Inspection.

How to fix fuel gauge on GMC Duramax?

Cut the tie and pull the wires from the harness and inspect for cuts and wear. The sharp corner of the FICM bracket where it is tied down to, cuts into the wires. Repair and insulate the harness with a short piece of heater hose.

What is the Dorman number on the fuel gauge?

Today I replaced the electrical connector for the fuel sending unit at the rear tank and it solved the problem. The Dorman part number is 645-668. I hope this information can be helpful to those dealing with this annoying gauge issue.

Cut the tie and pull the wires from the harness and inspect for cuts and wear. The sharp corner of the FICM bracket where it is tied down to, cuts into the wires. Repair and insulate the harness with a short piece of heater hose.

Today I replaced the electrical connector for the fuel sending unit at the rear tank and it solved the problem. The Dorman part number is 645-668. I hope this information can be helpful to those dealing with this annoying gauge issue.

What are the features of a Duramax high pressure fuel system?

Your Duramax high-pressure fuel system relies on several electronic components and sensors for proper operation. The Fuel Temperature Sensor can commonly throw codes and effect engine performance if it has failed. Features: Stock Replacement 13 Month Unlimited Mileage Warranty Replaces OE Part #: 97224993 Bostech Old Part#: ISK949

What kind of fuel rail plug does a Duramax use?

The Attitude Performance Products 2004 LB7 Fuel Rail Plug for your 2001-2004 GM 6.6L Duramax is designed to replace the stock pressure relief valve. This valve helps maintain fuel rail pressure during heavy engine load conditions, while eliminating the potential for low fuel rail pressure DTC Code P1093.

What kind of fuel cooler does a Duramax use?

The Dorman 904-180 Diesel Fuel Cooler for your 2001-2010 GM 6.6L Duramax is constructed of high quality, durable aluminum for sustained reliability. Fuel Coolers serve as a radiators for the fuel system. Features: Direct Replacement Quality Tested To Ensure Function Replaces GM OE Part#: 10371405

Your Duramax high-pressure fuel system relies on several electronic components and sensors for proper operation. The Fuel Temperature Sensor can commonly throw codes and effect engine performance if it has failed. Features: Stock Replacement 13 Month Unlimited Mileage Warranty Replaces OE Part #: 97224993 Bostech Old Part#: ISK949

The Attitude Performance Products 2004 LB7 Fuel Rail Plug for your 2001-2004 GM 6.6L Duramax is designed to replace the stock pressure relief valve. This valve helps maintain fuel rail pressure during heavy engine load conditions, while eliminating the potential for low fuel rail pressure DTC Code P1093.

The Dorman 904-180 Diesel Fuel Cooler for your 2001-2010 GM 6.6L Duramax is constructed of high quality, durable aluminum for sustained reliability. Fuel Coolers serve as a radiators for the fuel system. Features: Direct Replacement Quality Tested To Ensure Function Replaces GM OE Part#: 10371405

How many GMC Sierra 3500 HD dump trucks are there?

2004 GMC, C6500 Dump Truck, Medium Duty Truck, MECHANICAL Truck Application Air cleaner, dry-type standard filter element (Gasoline engines only) Unde… Our number is 480 833 2200. We have finance and shipping options. We take trade-ins and usually have around 30 of these used commercial work truck…

How big is a GMC C6500 dump truck?

2008 GMC C6500, 2008-2009 GMC C6500 chip trucks equipped with 11 foot (15yd.) chip dump boxes and man-cab’s. 8.1L gas engines, 6-speed manual transmis… 2006 GMC C6500 Chipper Dump Truck, Great running 2006 GMC C6500 with a chipper dump box and a man cab. V8 Gas Engine 8.1 Liter with Eaton-Fuller 6 Spe…

What kind of engine does a GMC Sierra 3500 have?

1999 GMC, W4500, Dump Truck, DUMP TRUCK, DIESEL PRE-DEF 86K MILES 4500, Air Conditioning,AM/FM,Anti-Lock Brakes,Diesel,Interval Wipers,Power Brakes,Po… 2004 GMC, C6500 Dump Truck, Medium Duty Truck, MECHANICAL Truck Application Air cleaner, dry-type standard filter element (Gasoline engines only) Unde…

Is the GMC Sierra 3500 HD chassis cab?

The advanced technology inside the Sierra 3500 HD Chassis Cab commercial truck helps keep you confidently connected to help you get the job done while on the road. you can stay connected to the internet right from the comfort of your Sierra 3500 HD Chassis Cab.

What kind of engine does GMC 3500 HD have?

Runs and Drives like new drive tires, newer engine. 2013 GMC 4X4 3500 HD Extended Cab 40749 Km, 8 Cyl, 6.6L, Automatic, Diesel, Vmac Air Compressor, Air Tank, 6 Storage Compartments, 3000Watt Inverter, LED Work Lights, Hose Reels. Enter search information and click the Search button below. Use the TAB key to move between fields.

What kind of cab does Chevy Silverado 3500 have?

BUILD ON A STRONG FOUNDATION. The Silverado 3500HD Chassis Cab features frame rails made of high-strength steel, utilizing nine cross members for rigid lateral support, and can be upfitted† to perform a range of tasks, including towing heavy loads, hauling large equipment and more. A wide variety of upfit options are available on this commercial…

What causes PCM to disable fuel injectors?

@jrt2020 , Josh, The anti-theft system (Pass Lock) failure will mimic this, as anti theft tells PCM to disable the fuel injectors.

What kind of fuel pump does a Chevy diesel engine use?

Fuel pumps or fuel lift pumps draw fuel from the fuel tank and pump it into the fuel injection system. Fuel pumps must keep fuel flow constant when the engine is running. Chevrolet uses two types of pumps; a conventional mechani- cal/diaphram type and an electric type. The mechanical/diaphram type is found on the 6.2 and 5.7 liter diesel engines.

Is there no fuel from injectors to start truck?

No fuel from injectors to start truck. When I try and start my 93 Chevy Cheyenne k3500 no fuel come out of the injectors. If I use starting fluid the truck starts and the injectors work great. Has died a couple times while driving, but mostly runs fine and then won’t start one turned off.

@jrt2020 , Josh, The anti-theft system (Pass Lock) failure will mimic this, as anti theft tells PCM to disable the fuel injectors.

What kind of fuel injection does a GMC use?

Back in 1992, General Motors introduced a new type of fuel injection system known as “Central Port Injection” (CPI), which GM also refers to as “Central Multi-point Fuel Injection” (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel Injection” (CSFI).

No fuel from injectors to start truck. When I try and start my 93 Chevy Cheyenne k3500 no fuel come out of the injectors. If I use starting fluid the truck starts and the injectors work great. Has died a couple times while driving, but mostly runs fine and then won’t start one turned off.

Both tanks fulled, go down the road for 150 or so miles. get two notches on fuel gage below a half tank marking, and the engine shuts down with a full tank in the rear and nothing in the front. Rear tank doesn’t supply the front as it’s always full.

Is the gas pump the same on the 3500?

For the side by side (L+R) tanks for the 3500, there is a porportional valve shown in the harness shared by both tanks. Both tank sending units/pumps seem to be the same PN. I have to suspect the selector or rear pump.

Which is rear gas tank on 1997 K3500?

3500 hd..the rear gas tank when i unplug the sending unit..trick… ASE MASTER TECH, REP… Vocational, Technical or Tra… Vocational, Technical or Tra… How do you switch fuel tanks on a 1997 K3500 with dual tanks.

How does a dual fuel tank system work?

On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. The main fuel balance pump supplies fuel to the fuel injection unit. The low pressure, about 32 kPa (7 psi) fuel balance pump is used only to transfer fuel from the auxiliary tank to the main tank in order to balance the fuel levels in both tanks.

The advanced technology inside the Sierra 3500 HD Chassis Cab commercial truck helps keep you confidently connected to help you get the job done while on the road. you can stay connected to the internet right from the comfort of your Sierra 3500 HD Chassis Cab.

Where to buy a new gas tank for a GMC Truck?

Buy a brand new high quality steel or plastic gas tank from Gas Tank Depot. Our GMC Truck Gas tanks are designed to be direct replacements and will accept the OEM factory sending units. If you do not see your Gas Tank give us a call at 386-788-8837 for a quote.

Where can I buy a GMC Sierra 3500?

What is a GMC SIERRA 3500 HD? Find New Or Used GMC SIERRA 3500 HD Trucks for Sale, Narrow down your search by make, model, or category. CommercialTruckTrader.com always has the largest selection of New Or Used Commercial Trucks for sale anywhere.

What kind of fuel tank does a Silverado 3500 have?

Some 2015-2018 Silverado and Sierra models and 2019 Silverado 2500/3500 and Sierra 2500/3500 models equipped with the 6.6L Duramax diesel engine (RPOs LML, L5P) and dual fuel tanks (23.5 gallon/89 liter front tank and 40 gallon/151 liter rear tank) (RPO N2N) may have poor fuel transfer or the rear fuel tank may have collapsed. (Fig. 13)

What’s the difference between front and rear gas tanks?

On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. The main fuel pump supplies fuel to the fuel injection unit. The low pressure (about 32 kPa or 7 psi) fuel balance pump is used only to transfer fuel from the auxiliary tank to the main tank in order to balance the fuel levels in both tanks.

Some 2015-2018 Silverado and Sierra models and 2019 Silverado 2500/3500 and Sierra 2500/3500 models equipped with the 6.6L Duramax diesel engine (RPOs LML, L5P) and dual fuel tanks (23.5 gallon/89 liter front tank and 40 gallon/151 liter rear tank) (RPO N2N) may have poor fuel transfer or the rear fuel tank may have collapsed. (Fig. 13)

On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. The main fuel pump supplies fuel to the fuel injection unit. The low pressure (about 32 kPa or 7 psi) fuel balance pump is used only to transfer fuel from the auxiliary tank to the main tank in order to balance the fuel levels in both tanks.

3500 hd..the rear gas tank when i unplug the sending unit..trick… ASE MASTER TECH, REP… Vocational, Technical or Tra… Vocational, Technical or Tra… How do you switch fuel tanks on a 1997 K3500 with dual tanks.