Ameer Randolph
Replacing the fuel pump in a 2003 Chevy Silverado is a complex task that requires a range of tools and a good amount of mechanical know-how. The fuel pump is located within the fuel tank, so the first step is to remove the fuel tank itself. This involves disconnecting the ground strap on the filler pipe, unbolting the support straps, and raising the tank with a jack. Once the tank is removed, the fuel pump module can be accessed and replaced. It's important to note that the fuel level needs to be low before starting this process, and it should be siphoned out with a vacuum pump kit rather than by mouth.
| Characteristics | Values |
|---|---|
| Removing and replacing a fuel pump in a 2003 Silverado 1500 truck | Replace the entire pump/sending unit module that is mounted within the fuel tank |
| Replacing the module | Ensure the fuel level is low; siphon out as much fuel as possible with a vacuum pump kit |
| Removing the fuel pump's relay | Locate the relay within the engine's fuse box using the box's diagram |
| Disconnecting the truck's negative battery cable | Crank the engine for several seconds, wait for it to stall, then disconnect |
| Disconnecting the fuel pump module | Disconnect the lines and electrical connectors from the flange on the tank |
| Raising the fuel tank | Use a transmission jack to raise the tank; unbolt the support straps with a wrench, then lower the jack |
| Removing the fuel tank's shield | Open the gas cap door, unscrew the flange surrounding the filler pipe, raise the truck's rear end, and unbolt the shield with a wrench |
| Lowering the new fuel pump module into the tank | Ensure the pump's float is not damaged, and align the module's line fittings with the old pump |
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What You'll Learn
Disconnect the fuel pump's relay from the engine's fuse box
To disconnect the fuel pump's relay from the engine's fuse box, you must first remove the fuel pump's relay from within the engine's fuse box. You can find the relay's location by looking at the box's diagram. Once you have located the relay, crank the engine for several seconds and wait for it to stall. Then, disconnect the truck's negative battery cable.
Before disconnecting the fuel pump's relay, you should siphon out as much fuel as possible with a proper vacuum pump kit. This is because the fuel pump can wear out if you constantly drive your truck with a low fuel level, but you need the fuel level to be low if you are going to replace the module.
You can then disconnect the lines and electrical connectors from the fuel pump module's flange on the tank. All these connectors should use quick-connect fittings that you can press by hand or with a small screwdriver.
It is also possible to access the in-tank pump by pulling the bed off the truck, instead of dropping the tank. To do this, you must remove the bed bolts and lift the bed.
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Disconnect the lines and electrical connectors from the fuel pump module's flange
To disconnect the lines and electrical connectors from the fuel pump module's flange on the tank, you will need to use a small screwdriver to press the quick-connect fittings. You will also need a wrench to unbolt the support straps. Before you begin, make sure the fuel level is low. Siphon out as much fuel as possible with a vacuum pump kit.
First, remove the fuel pump's relay from within the engine's fuse box. Then, crank the engine for several seconds and wait for it to stall. Disconnect the truck's negative battery cable.
Next, raise a transmission jack under the fuel tank to boost it. Once the tank is raised, unbolt the support straps with your wrench, lower the jack and remove the tank.
Now, you can disconnect the lines and electrical connectors from the fuel pump module's flange. Press and release the locking tab on the fuel pump module's flange ring using a needle-nose pointer while grasping the ring with a large pair of locking pliers. Turn the ring counterclockwise using the pliers to loosen it.
Finally, grab hold of the pump module by the line fittings and lift the module out of the tank.
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Remove the fuel tank
To remove the fuel tank from a 2003 Chevy Silverado, you must first ensure that the fuel level is low. Siphon out as much fuel as possible with a vacuum pump kit. Next, open the gas cap door and unscrew the flange that surrounds the filler pipe. You will need a screwdriver with an inverted hex bolt head to do this. Then, raise the truck's rear end and support it on jack stands. Disconnect the ground strap on the filler pipe and unbolt and remove the fuel tank's shield with a wrench. Disconnect the lines and electrical connectors from the fuel pump module's flange on the tank. You can do this by hand or with a small screwdriver. Raise a transmission jack under the fuel tank to boost it. Unbolt the support straps with your wrench, lower the jack and remove the tank.
One source suggests that it is easier to access the in-tank pump by pulling the bed off the truck, instead of dropping the tank. This method involves removing the bed bolts and lifting the bed off the truck.
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Lower the replacement fuel pump module into the tank
If you have not already removed the old fuel pump, you will need to disconnect the lines and electrical connectors from the fuel pump module's flange on the tank. You can do this by hand or with a small screwdriver. Raise a transmission jack under the fuel tank to boost it. Unbolt the support straps with a wrench, lower the jack and remove the tank. Press and release the locking tab on the fuel pump module's flange ring using a needle-nose pointer while grasping the ring with a large pair of locking pliers. Turn the ring counterclockwise using the pliers to loosen it. Grab hold of the pump module by the line fittings and lift the module out of the tank.
Alternatively, you can access the in-tank pump by pulling the bed off the truck, instead of dropping the tank.
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Make sure you don't damage the pump's float
When removing and replacing the fuel pump in a 2003 Silverado 1500 truck, you must replace the entire pump/sending unit module that is mounted within the fuel tank. To do this, you will need to remove the fuel pump's relay from within the engine's fuse box, siphon out as much fuel as possible, and disconnect the truck's negative battery cable. You will then need to disconnect the lines and electrical connectors from the fuel pump module's flange on the tank, and raise a transmission jack under the fuel tank to boost it. Unbolt the support straps, lower the jack, and remove the tank.
To make sure you don't damage the pump's float, you should be careful when you press and release the locking tab on the fuel pump module's flange ring using a needle-nose pointer. Grasp the ring with a large pair of locking pliers and turn it counterclockwise to loosen it. Grab hold of the pump module by the line fittings and lift the module out of the tank.
When you lower the replacement fuel pump module down into the tank, make sure you don't damage the pump's float at the bottom. Align the module so its line fittings point in the same direction as the old one.
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Frequently asked questions
To remove the fuel pump from your 2003 Chevy Silverado, you must first ensure that the fuel tank is as empty as possible. Then, remove the fuel pump's relay from the engine's fuse box, and disconnect the negative battery cable. Disconnect the lines and electrical connectors from the fuel pump module's flange on the tank, and raise a transmission jack under the fuel tank to boost it. Unbolt the support straps, lower the jack, and remove the tank.
To replace the fuel pump, you must first lower the new fuel pump module down into the tank, ensuring that you do not damage the pump's float at the bottom. Then, align the module so that its line fittings point in the same direction as the old one.
Yes, one source suggests that it is easier to access the in-tank pump if you pull the bed off the truck, instead of dropping the tank. To do this, you must take out the bed bolts and lift the bed.
