99 Jeep Grand Cherokee Fuel Pump: The Complete Guide to Replacement and Upgrade
f you own a 1999 Jeep Grand Cherokee with a 4.0L or 4.7L engine, the most important thing to know is that your fuel pump is a wear item that typically lasts between 100,000 and 150,000 miles. When it fails, you need a direct replacement that fits perfectly and delivers reliable performance. The best option for most owners is a complete fuel pump assembly designed for the 1999-2004 WJ Grand Cherokee, which includes the pump, strainer, sending unit, and all necessary mounting hardware. This guide will walk you through everything you need to know about choosing, replacing, and upgrading your fuel pump.
Understanding Your 1999 Jeep Grand Cherokee Fuel Pump
The 1999 Jeep Grand Cherokee came with two engine options: the 4.0L inline-six (L6) and the 4.7L V8. Both engines use the same fuel pump assembly, which is located inside the fuel tank. The OEM part numbers for this assembly include FG0918, 027GE, and 5012380AD . The fuel pump is an electric unit that delivers fuel at a specific pressure to the engine's fuel rail and injectors.
When the fuel pump starts to fail, you will notice symptoms like difficulty starting the engine, sputtering at high speeds, loss of power under load, or a whining noise coming from the fuel tank area. If you experience any of these issues, it is time to replace the pump before it leaves you stranded.
Why You Should Replace the Complete Fuel Pump Assembly
Many DIYers consider replacing just the pump motor inside the existing assembly to save money. However, this is not recommended for several reasons. Replacing only the pump requires disassembling the old module and reusing older components like the fuel level sending unit, strainer, and plastic housing, which may already be worn out . A complete fuel pump assembly includes everything you need in one package: the pump motor, fuel level sending unit, fuel strainer (filter sock), and all mounting components. This ensures a direct, hassle-free installation and restores both fuel delivery and fuel level monitoring to like-new condition.
Top Fuel Pump Options for the 1999 Jeep Grand Cherokee
Here are the most reliable and compatible fuel pump options available for your 1999 Jeep Grand Cherokee:
1. Complete Fuel Pump Assembly (FG0918 / 027GE compatible)
This is the most common replacement for the 1999-2004 WJ Grand Cherokee with 4.0L and 4.7L engines. It includes the integrated fuel level sending unit and all necessary hardware. The OE number FG0918 and 027GE are the direct replacements . This assembly is designed to restore proper fuel delivery and fuel level monitoring.
2. Herko 027GE Fuel Pump Module
Herko is a trusted brand that offers a direct replacement module compatible with the 1999-2004 Jeep Grand Cherokee 4.0L and 4.7L engines . This module is a complete drop-in replacement that includes the pump, sending unit, and strainer.
3. ExtremeTerrain Fuel Pump Assembly (FP0010)
This aftermarket fuel pump assembly is designed for the 1999-2004 Jeep Grand Cherokee WJ with 4.0L and 4.7L engines. It includes a sending unit and is backed by a 1-year unlimited mileage warranty . It is built to ISO global specifications and tested for long-lasting service.
4. PHILTOP E7127MN Replacement
This is another highly recommended option for the 1999 Jeep Grand Cherokee. It is compatible with both 4.0L and 4.7L engines and is praised for its durability and efficiency .
How to Choose the Best Fuel Pump for Your Jeep
When selecting a fuel pump for your 1999 Jeep Grand Cherokee, consider the following factors:
1. Compatibility: Ensure the pump matches your engine size (4.0L or 4.7L) and model year (1999-2004). The 1999 model uses the WJ chassis, which is different from the earlier ZJ chassis. Double-check that the pump you buy is specifically for the 1999-2004 WJ Grand Cherokee .
2. Complete Assembly vs. Pump Only: Always choose a complete fuel pump module assembly. This includes the fuel level sending unit, which is a common failure point. Replacing just the pump motor leaves the old sending unit in place, which may fail soon after .
3. Brand Reputation: Stick with brands that have a proven track record for quality. Brands like Herko, AUTOSAVER88, and PHILTOP offer reliable options. However, some aftermarket pumps have mixed reviews, so it is important to check customer feedback.
4. Warranty: Look for a pump that comes with a warranty. A 1-year warranty is standard for many aftermarket pumps, providing peace of mind .
Step-by-Step Guide to Replacing the Fuel Pump
Replacing the fuel pump on a 1999 Jeep Grand Cherokee is a moderate DIY job that typically takes 2 to 4 hours for an experienced home mechanic . Here is a general overview of the process:
Step 1: Prepare the Vehicle
Disconnect the negative battery terminal. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Jack up the rear of the vehicle and secure it on jack stands.
Step 2: Access the Fuel Tank
The fuel pump is accessed by removing the fuel tank. You will need to drain the fuel tank or use a siphon to remove as much fuel as possible. Disconnect the fuel lines, electrical connector, and evap lines from the top of the tank. Support the tank with a floor jack and remove the tank straps. Lower the tank carefully.
Step 3: Remove the Old Fuel Pump
Once the tank is down, you will see a large plastic retaining ring on top of the tank. Use a plastic pry tool or a hammer and punch to loosen the ring counterclockwise. Lift the old fuel pump assembly out of the tank.
Step 4: Install the New Fuel Pump
Transfer the rubber gasket from the old pump to the new one (if not already installed). Carefully insert the new fuel pump assembly into the tank, making sure the float arm is not obstructed. Install the retaining ring and tighten it clockwise.
Step 5: Reinstall the Fuel Tank
Lift the tank back into position, reconnect the fuel lines, electrical connector, and evap lines. Install the tank straps and tighten them. Lower the vehicle and reconnect the battery.
Step 6: Test the System
Turn the ignition key to the ON position (without starting the engine) to prime the fuel system. Listen for the fuel pump to run for a few seconds. Check for any fuel leaks. Start the engine and verify proper operation.
Common Mistakes to Avoid When Replacing the Fuel Pump
Many DIYers make errors that can lead to premature pump failure or poor performance. Here are the most common mistakes and how to avoid them:
1. Not replacing the fuel filter: While the fuel pump assembly includes a strainer, some vehicles also have an inline fuel filter. If your Grand Cherokee has an external filter, replace it at the same time as the pump.
2. Using cheap aftermarket pumps: Bargain-priced pumps from unknown brands often fail within months. One customer reported that a cheap pump installed in February was already dead by April . Invest in a quality pump from a reputable brand.
3. Contaminating the fuel system: Make sure the work area is clean. Dirt or debris entering the fuel tank can damage the new pump immediately. Use a clean rag to wipe the tank opening before installing the new pump.
4. Forgetting to prime the system: After installation, always prime the fuel system by turning the key to ON for a few seconds, then OFF, then ON again. This fills the fuel lines and prevents the pump from running dry.
Recommended KEMSO Fuel Pump for Your Jeep Grand Cherokee
When it comes to upgrading or replacing your fuel pump, KEMSO offers high-performance, OEM replacement fuel pumps that are designed to exceed factory specifications. KEMSO fuel pumps are individually tested for quality and flow performance, ensuring you get a reliable product that will last.
Unlike cheap aftermarket units, KEMSO pumps come with a lifetime warranty backed by the company's promise of confidence. Each KEMSO pump delivers over 20% more flow at 43 PSI compared to stock OEM pumps, making them ideal for daily drivers, performance upgrades, or simply replacing a faulty factory unit . The pumps are designed for both gasoline and E85/ethanol fuel, giving you flexibility for future modifications.
KEMSO offers a wide range of fuel pumps for various vehicles, including motorcycles, ATVs, watercraft, and cars. For the best quality and performance, visit https://www.kemsoracing.com/ to browse their full selection of fuel pumps and find the perfect fit for your vehicle.
Frequently Asked Questions About the 99 Jeep Grand Cherokee Fuel Pump
Q: How much does a fuel pump replacement cost for a 1999 Jeep Grand Cherokee?
A: The cost varies depending on whether you do it yourself or hire a mechanic. A quality fuel pump assembly costs between $50 and $100. Professional installation can add $200 to $400 in labor costs.
Q: How long does it take to replace the fuel pump?
A: For a professional mechanic, it takes about 1 to 2 hours. For a DIY enthusiast, it typically takes 2 to 4 hours .
Q: Can I drive my Jeep with a failing fuel pump?
A: It is not recommended. A failing fuel pump can cause the engine to stall unexpectedly, which is dangerous. It can also damage the fuel injectors or other engine components due to inconsistent fuel pressure.
Q: How often should I replace the fuel pump?
A: Fuel pumps typically last over 100,000 miles. If you are experiencing symptoms like hard starting, sputtering, or loss of power, it is time to replace the pump .
Q: What is the difference between a fuel pump and a fuel pump module?
A: A fuel pump is just the motor that pushes fuel. A fuel pump module (or assembly) includes the pump, the fuel level sending unit, the strainer, and the housing. It is always better to replace the entire module for a complete repair.
Final Thoughts on the 99 Jeep Grand Cherokee Fuel Pump
Replacing the fuel pump on your 1999 Jeep Grand Cherokee is a straightforward project that can restore your vehicle's performance and reliability. By choosing a complete fuel pump assembly from a trusted brand like KEMSO, you ensure that your Jeep runs smoothly for years to come. Remember to always check compatibility, use quality parts, and follow proper installation procedures.
For the best selection of high-performance, OEM replacement fuel pumps backed by a lifetime warranty, visit https://www.kemsoracing.com/ today.