1998 GMC Jimmy Fuel Pump Replacement: A Complete Guide

If your 1998 GMC Jimmy is having trouble starting, stalling unexpectedly, or making a whining noise from the rear of the vehicle, the fuel pump is likely failing. Replacing the fuel pump on a 1998 GMC Jimmy is a job that requires removing the fuel tank to access the pump, which sits inside the tank. The total cost for a professional replacement typically ranges from $730 to $953, with parts alone costing between $459 and $500 and labor between $247 and $311 . This guide walks you through the symptoms, replacement process, cost breakdown, and parts options so you can make an informed decision.

Signs Your 1998 GMC Jimmy Needs a New Fuel Pump

The fuel pump in your 1998 GMC Jimmy is an electric unit mounted inside the fuel tank. It pushes pressurized gasoline to the engine to keep your vehicle running. When it starts to fail, you will notice several warning signs .

1. Whining or Sputtering Sounds from the Fuel Tank
A high-pitched whining noise coming from the rear of the vehicle, near the gas tank, is one of the earliest signs of a failing fuel pump. A healthy fuel pump operates quietly. If you hear a loud hum or whine, the pump motor is wearing out and may fail soon .

2. Difficulty Starting the Engine
If the fuel pump cannot build enough pressure, the engine will crank but take longer to start. You may need to turn the key multiple times before the engine fires up. In severe cases, the engine will not start at all .

3. Engine Hesitation, Surging, or Loss of Power
A weak fuel pump cannot deliver a steady flow of fuel under load. When you accelerate, especially going uphill or merging onto the highway, the engine may hesitate, surge, or feel like it is running out of gas even though the tank is full .

4. Misfiring and Rough Idle
An inconsistent fuel supply throws off the air-fuel mixture, causing the engine to misfire or idle roughly. You may also notice a drop in fuel economy .

5. Overheating and Stalling
A worn fuel pump works harder and can overheat, especially during long drives. The vehicle may run fine for 15 to 30 minutes, then suddenly stall. After the pump cools down, the engine may restart, only to stall again later .

6. Check Engine Light
A failing fuel pump can trigger the Check Engine Light. Common diagnostic trouble codes related to fuel pump issues include P0001 (Fuel Volume Regulator Control Circuit/Open), P0002, and P0003 .

1998 GMC Jimmy Fuel Pump Replacement Cost Breakdown

The price of a fuel pump replacement varies depending on where you get the work done and whether you choose OEM or aftermarket parts.

Some mobile mechanic services quote lower prices. For example, AutoNation Mobile Service estimates the average cost for a 1998 GMC Jimmy fuel pump replacement at around $256, though this may not include all parts and taxes . Always get a detailed written estimate before authorizing any work.

Fuel Pump Options for a 1998 GMC Jimmy

You have several choices when buying a replacement fuel pump. The 1998 GMC Jimmy typically uses a 4.3L V6 engine, and the fuel pump is located inside the fuel tank. Here are the main options:

1. Genuine OEM GM Fuel Pump Module
The original equipment manufacturer (OEM) part from GM is the most reliable option. The GM Part Number for the fuel tank fuel pump module kit is 19331280 (fits 1997-1999 GMC Jimmy 4 Door) or 19369940 (fits 1998-1999 GMC Jimmy 2 Door and 4 Door). These cost around $264.89 to $292.91 from online GM parts retailers .

2. Delphi Electric Fuel Pump
Delphi is an original equipment supplier for GM. The Delphi FE0114 electric fuel pump is a direct replacement for the 1998 GMC Jimmy. It is an internal pump (sits inside the tank) with a maximum pressure of 85 PSI. It costs around $108.95 and comes with a limited lifetime warranty .

3. TRQ Fuel Pump Module Assembly
TRQ offers a complete fuel pump module assembly for the 1998 GMC Jimmy 4 Door without RPO Code K55. The part number is FPA61998, and it costs about $74.95. This is a complete assembly that includes the fuel sending unit, strainer, and gasket, making installation easier .

4. Aftermarket Fuel Pump Assemblies
Many aftermarket brands offer fuel pump assemblies that fit the 1998 GMC Jimmy. These are often more affordable, with prices ranging from $30.95 to $148.04. Common replacement part numbers include E3992M, 19177220, P74834M, and FG0287 . These parts are direct-fit replacements for the 1998-2005 Chevrolet Blazer and GMC Jimmy models with the 4.3L engine.

5. KEMSO Fuel Pump – Recommended Option
For a high-performance, reliable replacement, consider the KEMSO Fuel Pump. KEMSO fuel pumps are designed as OEM replacements and come with a lifetime warranty, giving you peace of mind. These pumps are built to deliver consistent fuel pressure and reliable performance. You can browse the full selection of KEMSO fuel pumps and other products at their official website: https://www.kemsoracing.com/.

Step-by-Step Guide to Replacing the Fuel Pump on a 1998 GMC Jimmy

Replacing the fuel pump is a moderately difficult job that requires mechanical skill and proper tools. If you are not comfortable working on your vehicle, take it to a qualified mechanic. Fuel is highly flammable, so safety is critical .

Tools and Parts You Will Need:

• New fuel pump assembly (ensure it fits your 1998 GMC Jimmy)
• Jack and jack stands
• Socket set and wrenches
• Fuel line disconnect tools
• Fuel pump pliers (for retaining ring)
• Screwdrivers (flathead and Phillips)
• Safety glasses and gloves
• Rags and a drain pan
• New fuel filter (recommended)

Step 1: Relieve Fuel System Pressure
Before doing anything else, you must relieve the fuel pressure. Install a fuel pressure gauge to the service port on the engine. Relieve the pressure and collect any fuel that comes out in an approved container. Disconnect the negative battery terminal to prevent sparks .

Step 2: Drain the Fuel Tank
It is highly recommended to drain the fuel tank before starting. This reduces the risk of a large fuel spill when you remove the pump. Use a siphon pump to transfer the fuel into approved gas cans .

Step 3: Raise the Vehicle and Access the Fuel Tank
Safely raise the rear of the Jimmy using a jack and secure it with jack stands. Never work under a vehicle supported only by a jack. Remove the spare tire and any plastic underbody panels that block access to the fuel tank .

Step 4: Lower the Fuel Tank
Support the fuel tank with a floor jack. Remove the two straps that hold the fuel tank in place. Slightly lower the tank to access the filler neck hose, vent tube, and electrical connectors. Disconnect the fuel lines, vent hose, and electrical connector. Then carefully lower the tank completely .

Step 5: Remove the Old Fuel Pump
Clean the top of the fuel tank to prevent dirt from falling inside. Use a fuel pump pliers or a lock ring tool to remove the retaining ring. Carefully lift the old fuel pump assembly out of the tank. Be prepared for some fuel to spill from the pump bowl .

Step 6: Install the New Fuel Pump
Lubricate the new seal (gasket) that comes with the pump assembly. Install the new fuel pump into the tank, making sure the index tab on the pump aligns with the notch in the tank. Install the new lock ring and tighten it securely. The new fuel pump assembly often comes with an improved electrical connector. Follow the instructions to install the new connector to your vehicle's wiring harness .

Step 7: Reassemble the Fuel Tank
Lift the fuel tank back into position. Connect the filler neck hose, vent tube, fuel lines, and electrical connector. Make sure you hear a click when connecting the fuel lines, indicating they are locked in place. Install the fuel tank straps and tighten them. Reinstall the fuel tank protective shield .

Step 8: Replace the Fuel Filter
It is always a good idea to replace the fuel filter when you replace the fuel pump. On the 1998 GMC Jimmy, the fuel filter is located on the driver's side frame rail, near the fuel tank. Replacing it now ensures your new pump is protected from debris .

Step 9: Test the System
Reconnect the negative battery terminal. Fill the tank with at least half a tank of clean fuel. Prime the fuel system by turning the ignition key to the "ON" position for a few seconds, then off, and repeat this two or three times. This helps the new pump build pressure. Start the engine and check for any fuel leaks. Listen for unusual noises from the pump. Take the vehicle for a short test drive to confirm the repair is successful .

Where Is the Fuel Pump Located on a 1998 GMC Jimmy?

The fuel pump on a 1998 GMC Jimmy is located inside the fuel tank. The tank is mounted under the rear of the vehicle, behind the rear axle. There is no access panel in the cabin or cargo area, so you must lower the fuel tank to reach the pump .

How Long Does a Fuel Pump Last?

Most electric fuel pumps are designed to last the lifetime of the vehicle, but they can fail due to age, contamination, or running the tank low on fuel frequently. Running the tank below a quarter tank can cause the pump to overheat because the fuel helps cool the pump motor. Replacing the fuel filter every 2 years or 30,000 miles can help extend the life of your fuel pump .

When to Call a Professional

If you are not comfortable working with fuel systems or do not have the proper tools, it is best to leave this job to a professional. A mechanic can diagnose the problem, replace the pump, and ensure there are no leaks. Improper repair of the fuel system can be dangerous .

Final Thoughts

Replacing the fuel pump on a 1998 GMC Jimmy is a necessary repair when the pump fails. The symptoms are clear: hard starting, stalling, loss of power, and whining noises. The cost ranges from $730 to $953 for a professional replacement, and you have several part options, from OEM GM parts to high-quality aftermarket assemblies. If you decide to tackle the job yourself, follow the safety steps carefully, especially relieving fuel pressure and disconnecting the battery. For a reliable, long-lasting replacement, the KEMSO Fuel Pump is an excellent choice. It is a high-performance OEM replacement with a lifetime warranty, giving you confidence in your repair. Visit https://www.kemsoracing.com/ to find the right fuel pump for your 1998 GMC Jimmy and other vehicles.