Replacing Fuel Pump In 2000 Gmc Jimmy: Step-By-Step Guide

The fuel pump in a 2000 GMC Jimmy is located inside the fuel tank. The tank must be removed to replace the pump. This can be done by siphoning the fuel and dropping the tank, or by cutting an access hatch in the floor of the car. The latter method is more convenient if you don't have the means to drop the tank, and it will also make any future fuel pump changes much quicker.

The fuel tank must be dropped to access the fuel pump

To access the fuel pump in a 2000 GMC Jimmy, you will need to drop the fuel tank. This is because the fuel pump is located inside the fuel tank.

• Park your GMC Jimmy on a level surface and engage the parking brake.
• Remove the fuel pump relay and run the engine until it stalls to relieve pressure.
• Remove the fuel filler cap to release any built-up pressure inside the tank.
• Jack up the vehicle and place jack stands for added safety.
• Locate the fuel tank and support it with a floor jack.
• Disconnect the negative battery cable.
• Remove the fuel tank shield and the tank straps to release the tank.
• Carefully lower the fuel tank halfway and disconnect the fuel lines and vapor hose from the tank and pump.
• Disconnect the electrical connection from the fuel pump.
• With the fuel tank supported, remove the fuel pump assembly by turning the locking ring counterclockwise using a suitable wrench.

At this point, you will have access to the fuel pump for replacement. It is important to note that gasoline is highly flammable, so appropriate safety precautions, such as working in a well-ventilated area and avoiding open flames, are crucial.

Additionally, some GMC Jimmy models may have an access panel in the passenger compartment that provides access to the fuel pump without dropping the tank. However, this method may not be applicable to all models, and dropping the tank is the standard recommended approach.

Siphon out fuel from the tank to make it easier to drop

To siphon out the fuel from the tank of a 2000 GMC Jimmy, you'll first need to obtain a gas canister and a length of clear plastic tubing that is 1 inch (2.5 cm) in diameter. Push one end of the tubing into the gas tank, ensuring it is fully submerged in the gasoline. Take the other end of the tubing and place it in your gas canister, ensuring that the canister is on the ground beneath the tank.

At this point, you can begin siphoning the fuel. One method is to use your mouth to create suction in the tube, drawing the gas out of the tank. However, this is not advised, as it carries the risk of swallowing gasoline or inhaling its toxic vapors. A safer method is to use a siphon pump, which can be purchased for a low price. Place the pump in the middle of the tubing and operate it to create suction, pulling the liquid from the tank to the canister.

Alternatively, you can try a method that involves creating pressure in the tank. For this, you will need two lengths of tubing - one long enough to reach deep into the tank, and a shorter one that reaches just inside. Feed both tubes into the tank side by side, then use a rag to create a seal around them. Blow air into the shorter tube to increase the pressure inside the tank, which will cause the gasoline to flow through the longer tube and into your canister.

Disconnect the negative battery cable

Disconnecting the negative battery cable is one of the first steps to take when replacing the fuel pump in a 2000 GMC Jimmy. Here is a detailed, step-by-step guide on how to do this:

Step 1: Park your GMC Jimmy on a level surface and engage the parking brake. This is important to ensure your safety while working on the vehicle.

Step 2: Locate the negative battery terminal. The battery is typically located in the engine compartment of the vehicle.

Step 3: Identify the negative battery cable. It is usually black and has a "-" symbol or a black clamp.

Step 4: Before proceeding, ensure that you are wearing protective gear, such as gloves and eye protection. Working with batteries can be dangerous due to the presence of corrosive acids and the risk of electrical short circuits.

Step 5: Using the appropriate size wrench or socket, loosen the nut or bolt that secures the negative battery cable to the terminal. Do not allow the wrench or socket to touch both the positive and negative terminals simultaneously, as this may cause a short circuit.

Step 6: Once the nut or bolt is loosened, carefully remove the cable from the terminal. You may need to wiggle it gently to detach it completely.

Step 7: After the cable is disconnected, move it away from the battery to avoid accidental contact. You can use a cable tie or tape to secure it in a safe position.

Step 8: Check the battery terminal for any signs of corrosion or damage. If there is corrosion, you can clean it using a mixture of baking soda and water. Apply the mixture to the terminal and use a wire brush to scrub away the corrosion gently.

Step 9: If the battery cable or terminal is damaged, it is essential to replace them before reconnecting. A damaged cable can cause power loss and potential safety hazards.

Step 10: At this point, you can proceed with the rest of the fuel pump replacement procedure, following the instructions provided in your repair manual or online resources.

Remember to exercise caution when working with automotive batteries, and always refer to the vehicle's repair manual or seek advice from a qualified mechanic if you are unsure about any steps.

Remove fuel lines and vapor hose from the pump and tank

To remove the fuel lines and vapor hose from the pump and tank of your 2000 GMC Jimmy, you will need to follow these steps:

First, relieve the fuel system pressure and drain the fuel tank through the filler pipe. Support the fuel tank and remove the negative battery cable, shield, and tank straps.

Next, locate the fuel lines and vapor hose. Carefully disconnect them from the pump and tank, being mindful of any residual fuel. Once these are disconnected, you can proceed to remove the electrical connection from the fuel pump.

It is important to work carefully and methodically when performing these steps to ensure a safe and successful fuel pump replacement.

Remove the fuel pump lock ring

To remove the fuel pump lock ring, you will first need to relieve the fuel system pressure and drain the fuel tank through the filler pipe. Support the fuel tank with a jack and disconnect the negative battery cable, shield and tank straps, fuel lines, and vapor hose from the pump and tank. You can then disconnect the electrical connection from the fuel pump.

The fuel pump/sending unit assembly can now be removed by turning the locking ring (located on top of the fuel tank) counterclockwise using a spanner wrench. Be sure to have a towel handy as some residual fuel may spill out.

To install the new fuel pump, lower it into place inside the tank and secure its screws in a clockwise direction. Do not over-tighten the screws as this may damage the plastic fuel pump.

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