Replacing The Fuel Pump In Your 1998 Gmc Sierra

If you own a 1998 GMC Sierra and are experiencing issues with your fuel pump, you may be wondering if it's possible to replace it yourself. While it's a complex process, with the right tools and safety precautions, it can be done at home. This guide will outline the steps to replace the fuel pump in your 1998 GMC Sierra, covering the necessary safety precautions, tools, and step-by-step instructions to ensure a successful replacement.

Removing the bed vs dropping the tank

When it comes to replacing the fuel pump on a 1998 GMC Sierra, there are three main options: dropping the fuel tank, removing the bed, or cutting a hole in the bed. Here's a detailed look at the first two options and how they compare:

Dropping the Fuel Tank:

This method involves draining the fuel tank and then removing it from the vehicle to access the fuel pump. This is considered the easier option of the two and can be done by one person in a relatively short amount of time (approximately 2 hours). When dropping the tank, it is important to ensure that the tank is as close to empty as possible, as fuel is heavy. It is also recommended to use a product like PB Blaster to help with the process.

Removing the Bed:

This method involves unbolting the bed of the truck and sliding it back to access the fuel pump. This can be done quickly with an impact and a 18mm socket to remove the bolts that fasten the bed to the frame. However, this method is more feasible when there is a lot of fuel in the tank, as the full weight of a full tank can make this process more challenging.

Comparison:

Both methods have their advantages and disadvantages. Dropping the fuel tank is generally considered easier and can be done by one person, but it requires ensuring the tank is empty and taking the time to drain it. Removing the bed can be faster, especially with the right tools, but the weight of a full fuel tank can make manoeuvring the bed more difficult. Ultimately, the decision between the two methods depends on factors such as the amount of fuel in the tank, the tools available, and personal preference.

Using a rubber mallet

To replace the fuel pump in a 1998 GMC Sierra, you can use a rubber mallet to gently tap the bottom of the fuel tank while someone cranks the engine. This may help to power up the pump and get it spinning again. If you are attempting to replace the fuel pump, you will need to remove the bed of the truck or drop the tank.

If you decide to drop the tank, you will need to place the vehicle on jack stands and remove the tank shield using a 13mm socket. You will then need to disconnect the fuel lines and electrical connectors from the fuel pump before removing the retaining ring and taking out the old pump. Make sure to blow off any dirt or debris from around the fuel tank opening before removing the old pump to prevent anything from falling into the tank.

Once the old pump is removed, you can install the new pump by sliding it into place and securing it with the retaining ring. Reattach the fuel lines and electrical connectors, and raise the tank back into position. Reinstall the tank straps and tank shield, and reconnect the filler tube and ground strap. Finally, reinstall the fuel pump relay and start the engine to test the new pump.

Fuel pump brands

When it comes to replacing the fuel pump in a 1998 GMC Sierra, there are several reputable brands that offer compatible products. Here is an overview of some well-known fuel pump brands and their features:

Delphi

Delphi is a trusted brand that offers a fuel pump module assembly designed to meet Original Equipment (OE) standards. Their fuel pumps are built with lower amperage, reducing the load on the vehicle's electrical system. Delphi's products are known for their innovation and durability, ensuring lower failure rates.

Carquest Premium

Carquest Premium fuel pump modules and assemblies are engineered to meet or exceed OE specifications. They feature 100% carbon commutators, which provide resistance to aggressive fuels and double the expected lifespan of the pump. Carquest Premium also offers superior return porting for optimum fuel flow and enhanced electrical performance.

GM Genuine Parts

GM Genuine Parts offer fuel pump and level sensor modules that are designed to provide a reliable fuel supply to your vehicle's engine. These modules are engineered to optimise pump life, reduce fuel pump noise, and eliminate high resistance due to vehicle vibration. GM regularly updates its production and service part designs to integrate new materials and technologies.

ACDelco

ACDelco is a well-known brand that offers original equipment electric fuel pumps. Their products are designed to meet high industry standards, ensuring impressive fuel delivery performance, quick engine starts, and continuous fuel supply. ACDelco fuel pumps are manufactured in ISO-9001 and QS-9000 registered facilities, assuring quality and durability.

Spectra Premium

Spectra Premium electrical fuel pumps are engineered and developed in Canada, meeting or exceeding the performance of the original equipment they replace. They undergo rigorous testing, including endurance tests, to ensure reliable performance. Spectra Premium is committed to delivering innovative products that meet stringent quality standards.

Dorman

Dorman offers a direct replacement fuel pump module that matches the fit and function of the original equipment. Their fuel pumps are built from durable materials, ensuring a long service life. With over 100 years of experience, Dorman is known for its reliable automotive parts.

TREperformance

TREperformance offers a high-pressure in-tank fuel pump that can support over 600 horsepower in naturally aspirated engines and 500 horsepower in supercharged or turbo applications. Their fuel pumps are known for being silent, making them perfect for performance cars and stock replacement pumps. TREperformance also provides a 1-year free replacement guarantee for their products.

These brands offer a range of options for replacing the fuel pump in your 1998 GMC Sierra, each with its unique features and advantages. It is essential to consider factors such as compatibility, performance, and reliability when choosing the right brand for your vehicle.

Accessing the fuel pump

Option 1: Removing the Bed or Dropping the Tank

• One common approach is to remove the bed of the truck or drop the fuel tank to access the pump. This method can be more straightforward but may require additional tools and effort.
• If you choose to remove the bed, start by loosening the bolts on one side and removing the bolts on the other. You can use a ratchet strap and an engine hoist to lift the bed and hold it in place safely.
• Alternatively, you can drain the fuel tank as much as possible and drop the tank to access the fuel pump. Ensure you have a safe way to drain the fuel and handle the heavy tank.

Option 2: Creating an Access Panel in the Bed

• Another option is to create an access panel or cut a hole in the bed of the truck to reach the fuel pump without removing the entire bed. This method can be more convenient but requires careful measurements and execution.
• Measure and mark the location for the access panel, typically towards the front and on the driver's side of the bed.
• Cut a hole in the bed, ensuring it is large enough to access the fuel pump and any necessary connections. Consider extending the hole to provide better access to fittings and the ground wire.
• You can reinforce the cut edge of the hole with a metal strip and paint it for a more finished look.
• This method provides an easier way to access the fuel pump and can be covered with a hatch or plate when not in use.

Final Thoughts:

• Regardless of the method chosen, always take the necessary safety precautions when working with fuel systems. Wear safety goggles or a face shield to protect your eyes from any fuel spray during the process.
• It is also recommended to use high-quality replacement parts, such as those from AC Delco or Delphi, to ensure the longevity of the repair.

Replacing the fuel filter

To replace the fuel filter on your 1998 GMC Sierra, you'll need to locate the fuel filter, which is either inside the fuel tank or externally in the fuel flow line. Once you've located the fuel filter, you can follow these steps:

• Relieve fuel pressure from the engine-side. This will depressurize the rail.
• Disconnect the electrical connector and remove the fuel pump from the assembly.
• Clean the old fuel filter and the area around it.
• Install the new fuel filter. Make sure to wet the O-rings and fitting nuts with petroleum jelly or grease to create a tight seal and protect the plating on the tubes.
• Reattach the electrical connector and secure the fuel pump assembly back into place.
• Prime the system by turning the key in the ignition on and off a few times.
• Check for leaks.

It is important to note that you should always replace the fuel filter with a new, high-quality one. Additionally, be very cautious when working with fuel and ensure there is no source of ignition nearby.

Frequently asked questions