Regan Brown
The 2007 Chevy Silverado, Avalanche, Tahoe, and Suburban, and GMC Sierra and Yukon require a fuel pump and fuel level sending unit replacement. The fuel tank must be lowered from under the truck to access the fuel pump lock ring on the top of the tank. The EVAP vent line, the fuel tank vent line fitting, and the fuel supply line quick-connect fittings must be disconnected from the fuel pump/fuel level sending unit mounting flange. The fuel pump lock ring can be loosened with a hammer and brass punch if it is too tight to be loosened with a pair of large water pump pliers. The fuel pump/fuel level sensor module is then removed from the fuel tank, and the O-ring is inspected for cracks, tears, and deterioration. If the O-ring is not in perfect condition, it must be replaced. The fuel pump/fuel level sensor module is then inserted into the fuel tank, and the marks made on the fuel pump/fuel level sending unit flange and the tank are aligned. It is important to ensure that the float arm or float are not damaged during installation, as a bent float arm will cause the fuel level gauge to display an incorrect fuel level.
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What You'll Learn
- The fuel tank must have a vent to relieve vacuum and pressure
- The EVAP vent line, fuel tank vent line and fuel supply line must be oriented correctly
- The fuel tank vent line fitting must be disconnected from the fuel pump
- The fuel pump lock ring must be loosened with a hammer and brass punch
- The fuel pump/fuel level sensor module must be inserted into the fuel tank
The fuel tank must have a vent to relieve vacuum and pressure
The vent allows air to enter the tank when fuel is used, maintaining atmospheric pressure inside. Without this, a vacuum would form, causing fuel flow issues and engine performance problems. The vent also releases pressure that builds up due to fuel evaporation, temperature changes, and the pumping action of the fuel pump. This prevents the fuel tank from becoming a pressure vessel, which could lead to leaks or even explosions.
The 2007 fuel tank design includes a venting system that runs through the fuel pump module. This module is a multi-functional unit, often incorporating the fuel pump, fuel level sensor, and venting system. The vent typically consists of a valve and a series of hoses or tubes that connect the fuel tank to a charcoal canister.
The charcoal canister plays a vital role in the venting system. It captures and stores fuel vapors, preventing their release into the atmosphere. This canister contains activated carbon, which absorbs and traps the fuel vapors. The stored vapors are then drawn back into the engine during specific operating conditions, where they are burned off, ensuring a clean and efficient venting process.
The venting system in the 2007 fuel tank design is critical to ensuring the safe and efficient operation of the vehicle's fuel system. By incorporating the vent through the fuel pump module, engineers have created a streamlined and integrated design, optimizing space and functionality. This design allows for proper ventilation, ensuring vacuum and pressure relief, and contributing to the overall reliability and performance of the vehicle.
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The EVAP vent line, fuel tank vent line and fuel supply line must be oriented correctly
The EVAP vent line, fuel tank vent line, and fuel supply line must be oriented correctly when installing the fuel pump/fuel level sending unit. This is done to ensure that the pipes are correctly aligned.
To do this, first, make alignment marks on the tank and the pump flange. Then, remove the fuel pump/fuel level sensor module. Ensure that it is high enough to disconnect the quick-connect fitting for the ventilation harness. Next, carefully remove the pump assembly, being careful not to damage the fuel level sensor float arm and float. Once the module has cleared the mounting hole in the tank, angle it to work the float arm through the mounting hole without causing any damage.
Before installing the pump, inspect the O-ring for cracks, tears, and deterioration. Replace the O-ring if it is not in perfect condition. Insert the fuel pump/fuel level sensor module into the fuel tank, aligning the marks made earlier. Ensure that the float arm and float are not damaged during installation, as a bent float arm will cause the fuel level gauge to indicate an incorrect fuel level.
It is important to note that gasoline is extremely flammable, so extra precautions must be taken when working on any part of the fuel system. Do not smoke or allow open flames or bare light bulbs near the work area. It is also important to ensure that the vent is mounted vertically. Mounting the vent at an angle may cause the vent to shut off.
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The fuel tank vent line fitting must be disconnected from the fuel pump
To disconnect the fuel tank vent line fitting from the fuel pump, follow these steps:
Firstly, it is important to understand why this process is necessary. Your fuel tank needs to breathe, and to do this, it must have a vent that relieves both vacuum and pressure. Gasoline expands and shrinks in volume as it warms and cools, and the fuel level in your tank changes throughout the day, even when you are not driving. Therefore, you need to be able to get air out of and into your tank when filling it with fuel or withdrawing fuel from it.
Now, to the process. Before starting, ensure your tank is not full, as gasoline is extremely flammable, and you want to avoid spills. The following steps are for a 2007-2013 Chevy Silverado, Avalanche, Tahoe, and Suburban, and GMC Sierra and Yukon, and may differ for other makes and models.
To disconnect the fuel tank vent line fitting from the fuel pump, you will first need to remove the fuel pump/fuel level sensor module. To do this, lower the tank from under the truck to access the fuel pump lock ring on top of the tank. Once you have access, use a pair of large water pump pliers to unscrew the fuel pump lock ring by turning it counterclockwise. If the lock ring is too tight, use a hammer and a brass punch to loosen it—do not use a steel punch, as this could cause sparks and lead to an explosion.
After removing the lock ring, carefully remove the fuel pump/fuel level sensor module from the fuel tank. Angle the module as you remove it to work the float arm through the mounting hole without causing any damage. Before proceeding further, inspect the O-ring for any cracks, tears, or deterioration, and replace it if necessary.
Now that the module is removed, you can disconnect the fuel tank vent line fitting from the fuel pump. Make sure to mark the orientation of the pump mounting flange and the fuel pump in relation to the fuel tank to ensure correct realignment when installing the new pump.
Finally, some additional notes on fuel tank venting. If you are running a vent line, ensure that the line is higher than the highest point on the tank, including the fuel filler neck. Also, the vent line should not have any dips where fuel or condensation can get trapped. Additionally, if you are using an in-line remote rollover vent valve, ensure that the vent is mounted vertically, with the check ball in the bottom fitting. Mounting the vent at an angle may cause it to shut off.
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The fuel pump lock ring must be loosened with a hammer and brass punch
To replace the fuel pump and fuel level sending unit in the fuel tank of a 2007 Chevy Silverado, Avalanche, Tahoe, or Suburban, or a GMC Sierra or Yukon, you must first lower the tank from under the truck. It is recommended to do this when there is less than a quarter of a tank of fuel in the tank. Gasoline is extremely flammable, so take extra precautions when working on any part of the fuel system.
To access the fuel pump lock ring, you must first disconnect the EVAP vent line, the fuel tank vent line fitting, and the fuel supply line quick-connect fittings from the fuel pump/fuel level sending unit mounting flange. If the lock ring is too tight, it can be loosened with a hammer and a brass punch (do not use a steel punch, as this could produce sparks and cause an explosion). Use a large pair of water pump pliers to unscrew the fuel pump lock ring. If the lock ring is too tight to loosen this way, carefully tap it loose with a hammer and brass punch.
Some people have soaked the lock ring in PB blaster for several days before attempting to remove it, but this has not always been successful. Others have used an air hammer with a brass tip, or an air hammer and a chisel bit, to remove the lock ring. However, there are concerns about sparks when using this method.
When installing the new lock ring, coat it with paint or primer to prevent rust.
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The fuel pump/fuel level sensor module must be inserted into the fuel tank
It is important to understand the function of a fuel tank vent before inserting the fuel pump/fuel level sensor module into the fuel tank. A fuel tank vent relieves both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down, causing the fuel level in the tank to fluctuate throughout the day, even without driving. The vent allows air to escape from the tank when filling it with fuel and lets air into the tank when withdrawing fuel.
Now, to insert the fuel pump/fuel level sensor module into the fuel tank, follow these steps:
Firstly, ensure that the fuel tank is lowered from under the truck and that there is less than a quarter of a tank of fuel. This is important because gasoline is extremely flammable, so extra precautions must be taken when working with any part of the fuel system. No smoking or open flames are allowed near the work area.
Next, disconnect the EVAP vent line, the fuel tank vent line fitting, and the fuel supply line quick-connect fittings from the fuel pump/fuel level sending unit mounting flange. Use a pair of large water pump pliers to unscrew the fuel pump/fuel level sending unit module lock ring by turning it counterclockwise. If the lock ring is too tight, use a hammer and a brass punch to loosen it – do not use a steel punch to avoid sparks and the risk of an explosion.
Then, remove the fuel pump/fuel level sensor module from the fuel tank. Ensure that the float arm is not damaged during this process, as a bent float arm will result in an incorrect fuel level reading on the fuel gauge.
Finally, insert the fuel pump/fuel level sensor module into the fuel tank. Align the marks made on the fuel pump/fuel level sending unit flange and the tank, and carefully seat the pump flange on the tank. Again, be cautious not to damage the float arm or the float during installation.
The installation process is now complete, and you can reverse the removal steps to reinstall any parts that were removed during the process.
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Frequently asked questions
Yes, the 2007 Chevy Silverado, Avalanche, Tahoe, and Suburban and GMC Sierra and Yukon models all have a fuel tank that vents through the fuel pump module.
A vent is important as it allows the fuel tank to breathe by relieving vacuum and pressure. This is necessary because gasoline expands and shrinks in volume due to temperature changes.
If the vent is blocked, the tank will build pressure or vacuum, which can cause gas and/or odour to come from the vent line. If the pressure builds up, it could damage the tank.
Some symptoms of a blocked vent include issues with filling the tank, such as the pump shutting off or not being able to fill the tank fully.
