2004 SeaDoo GTI LE RFI Fuel Pump: Complete Owner's Guide to Symptoms, Testing, and Replacement

The bottom line: If you own a 2004 SeaDoo GTI LE RFI and you are experiencing hard starting, engine sputtering, loss of power, or a whining noise coming from the fuel tank area, the fuel pump is very likely the culprit. The 2004 GTI LE RFI uses a Rotax 787 RFI (Rotax Fuel Injection) engine, and the fuel pump is the heart of that system. When it starts to fail, the entire watercraft becomes unreliable. The good news is that replacing the fuel pump on this model is a well-documented job that most DIY owners can complete in a weekend with basic hand tools. This guide walks you through everything you need to know: how the system works, what symptoms to watch for, how to test the pump before you buy anything, what your replacement options are, and a step-by-step installation guide.

Understanding the Fuel System on the 2004 GTI LE RFI

The RFI system on your SeaDoo is a batch-fire electronic fuel injection system. Unlike carbureted models that rely on mechanical fuel delivery, the RFI system depends entirely on an electric fuel pump to pressurize fuel and deliver it to the injectors. The pump sits inside the fuel tank as part of a module assembly that also includes the fuel level sending unit and internal filter.

The fuel pump on the 2004 GTI LE RFI is a high-pressure unit that operates at roughly 43 to 68 psi, depending on engine demand. The stock OEM pump is a Bosch unit that delivers a specific flow rate at a specific amperage draw. This is important because the charging system on the RFI models was designed around that amperage draw. Aftermarket pumps that draw significantly more current can overload the rectifier and cause premature failure of the battery charging circuit.

The 2004 GTI LE RFI uses the same fuel pump module as several other SeaDoo models from the same era. The original OEM part numbers for the complete module include 270600089, 270600029, 270600003, and 270600015, with later superseding numbers like 270600031, 270600041, 270600056, 270600087, and 204560418. The pump itself is a drop-in replacement inside the module, and the pump-only part number is 204560418, which supersedes the earlier 204560400 and 204560334.

5 Common Symptoms of a Failing Fuel Pump

Fuel pump failure rarely happens without warning. Here are the most common symptoms owners report:

1. Hard Starting or No Start
The engine cranks but takes longer than usual to fire, or it refuses to start altogether. This happens because the pump cannot build enough pressure in the fuel rail to support combustion. On the RFI system, the pump must pressurize the rail to roughly 58–60 psi before the engine will start.

2. Engine Sputtering or Hesitation
Once the engine is running, you may notice sputtering, hesitation, or a general lack of power, especially under acceleration. The injectors are not receiving a steady supply of pressurized fuel, so the air-fuel mixture becomes inconsistent.

3. Sudden Loss of Power While Riding
The engine may run fine for a while, then suddenly lose power or stall as if you hit the kill switch. The pump overheats or the internal brushes wear to the point where it intermittently stops delivering fuel.

4. Whining Noise from the Fuel Tank
A healthy fuel pump runs quietly. If you hear a high-pitched whine or howl coming from the fuel tank area, especially when you first turn the key on, the pump bearings are wearing out. This is often the first audible warning sign before performance issues appear.

5. Drop in Fuel Pressure During a Test
If you connect a fuel pressure gauge and the pressure reads below spec, fails to build quickly, or drops off rapidly after the pump shuts off, the pump is weak or failing. A healthy pump should immediately jump to approximately 58-60 psi when the DESS key is attached and the system is powered up.

How to Test the Fuel Pump Before Replacing It

Before you spend money on a new pump, it is worth spending 30 minutes to confirm the diagnosis. Testing the pump is straightforward and requires only a few tools: a fuel pressure gauge kit and a 5/16-inch fuel line disconnect tool. These are available at any auto parts store for around $40 to $60.

Step 1: Relieve Fuel System Pressure.
Place a rag over the fuel line connection at the fuel rail. Using the fuel line disconnect tool, carefully disconnect the line. Fuel will spray out, so keep the rag in place and work in a well-ventilated area away from any ignition sources.

Step 2: Install the Pressure Gauge.
Connect the fuel pressure gauge in-line between the fuel pump outlet on the tank and the fuel rail. This gives you a direct reading of what the pump is actually delivering.

Step 3: Power Up the System.
Attach the DESS key. The pump should prime for two to three seconds. The pressure should immediately jump to approximately 58-60 psi. If the pressure is low, fails to build, or drops off quickly, the fuel pump is likely weak or failing.

Step 4: Check the Fuse and Relay First.
Before condemning the pump, verify the fuel pump fuse and relay are functional. If the fuse is blown, replace it with one of the same amperage and re-test. If the fuse and relay are good, check for power and ground at the pump connector. If there is power and ground at the pump and it still does not run, the pump itself is faulty.

Pro Tip: Water or debris in the fuel tank is a common cause of fuel pump failure. When you remove the pump assembly, inspect the inside of the tank for contamination. If you find debris, the tank must be thoroughly cleaned before installing a new pump.

What Are Your Replacement Options?

When the fuel pump fails, you have several options. Each has pros and cons, and the right choice depends on your budget, your mechanical skill level, and how long you plan to keep the watercraft.

1. New OEM Module ($500 – $900+)
This is the most expensive option but also the safest. A complete new OEM module includes the pump, the pressure regulator, the fuel level sending unit, and the filters. It is a direct bolt-in with no modifications required. The downside is the cost. OEM modules for the RFI models are expensive, and some owners find it hard to justify spending that much on a 20-year-old watercraft.

2. New Aftermarket Pump-Only Kit ($25 – $120)
This is the most affordable option. You remove the entire fuel pump module from the tank, disassemble it, drill out the rivets, and replace just the internal pump motor and filters. Kits are available from brands like KEMSO, FPF, and others. The downside is the labor involved and the risk that a cheap aftermarket pump may not meet SeaDoo's specific pressure requirements or may draw too much power, which can lead to premature failure of the ski's rectifier or charging system.

3. Used OEM Module ($150 – $350)
For many owners, a good used OEM module is the best balance of reliability and value. It is a plug-and-play solution that was designed specifically for the RFI engine. The key is knowing what to inspect on a used unit. Check the electrical connector pins for corrosion, burning, or melting. Inspect the entire plastic housing for cracks. Look at the fuel strainer at the bottom: a clean, white sock indicates a healthy life, while a dark, debris-clogged sock suggests the pump was stressed by contaminated fuel.

Step-by-Step Fuel Pump Replacement Guide

Replacing the fuel pump on the 2004 GTI LE RFI is a manageable job for a DIYer with basic mechanical skills. The entire process takes about two to three hours, including the time to remove and reinstall the seat and storage bin. The job must be done in a well-ventilated area away from any ignition sources because you are working with gasoline.

Tools You Will Need:

• Socket set with 8mm and 10mm sockets
• Flathead screwdriver
• 5/16-inch fuel line disconnect tool
• New rubber tank seal
• Fuel pressure gauge (if testing)
• Shop rags and a drain pan
• Safety glasses and gloves

Step 1: Disconnect the Battery.
Always disconnect the negative battery cable before working on any part of the fuel system. This prevents accidental sparks and protects the electrical system.

Step 2: Access the Fuel Pump Module.
On the GTI LE RFI, the fuel pump is located on top of the fuel tank. You access it by removing the main front storage bin. Some models also require removing the glove box. The plastic storage bin is held in place by several screws and clips. Once removed, you will see the black circular fuel pump module sitting on top of the tank.

Step 3: Disconnect the Fuel Lines and Electrical Harness.
Use the 5/16-inch fuel line tool to disconnect the fuel lines from the top of the pump module. Have a rag ready because some fuel will spill. Disconnect the main electrical harness by pressing the release tab and pulling the connector straight off. Take a photo with your phone before disconnecting so you have a reference for reinstallation.

Step 4: Remove the Module from the Tank.
The module is held to the tank by numerous 8mm nuts around its perimeter. Once the nuts are removed, the entire assembly must be carefully rotated and maneuvered to get it out of the tank opening without damaging the fuel level float arm. The float arm is fragile and can bend easily, which will reduce the fuel sensor capabilities. Pull the module straight up, tilting it as needed to clear the float arm and strainer.

Step 5: Replace the Pump Internals (If Using a Pump-Only Kit).
If you are replacing just the pump, turn the module upside down. Using a small flathead screwdriver, remove the fuel filter by prying the inner plastic ring. Remove the old pump motor and discard it. Install the new pump in reverse order, making sure the orientation matches the original. Reinstall the fuel filter and ensure the plastic ring snaps back into place securely.

Step 6: Inspect and Clean the Tank.
With the module removed, take a flashlight and inspect the inside of the fuel tank for debris, water, or rust. If you find contamination, the tank must be thoroughly cleaned before installing the new pump. Skipping this step is the number one cause of premature fuel pump failure after replacement.

Step 7: Install the New Module and Seal.
Install a new rubber tank seal on the module before lowering it into the tank. Lightly lubricate the seal with clean fuel to help it seat properly. Lower the new or rebuilt module into the tank carefully, making sure the float arm and strainer are not bent or folded. Align any positioning tabs or arrows before installing the retaining ring. Tighten the nuts evenly to ensure a good seal.

Step 8: Reconnect Everything.
Reconnect the fuel lines until they click or lock positively, then tug lightly to confirm they are secure. Reconnect the electrical harness. Reinstall the storage bin and any other components you removed.

Step 9: Reconnect the Battery and Prime the System.
Reconnect the negative battery cable. Cycle the ignition key to the ON position for several seconds, then back off. Repeat two or three times to prime the system and purge air from the lines. This allows the new pump to build pressure before you attempt to crank the engine.

Step 10: Test the Repair.
Attach the DESS key and start the engine. Inspect every fuel connection immediately for leaks. If you have a fuel pressure gauge, verify the pressure is within spec (58-60 psi at prime) and remains stable. Take the watercraft for a test ride to confirm the repair is successful.

Why You Should Buy a KEMSO Brand Fuel Pump for Your SeaDoo

When it comes time to replace the fuel pump on your 2004 SeaDoo GTI LE RFI, you want a part that delivers reliable performance without breaking the bank. KEMSO fuel pumps are the ideal choice for owners who want high performance and OEM-level quality at a fraction of the dealer price.

KEMSO is a manufacturer of high-performance fuel pumps designed as direct OEM replacements. The KEMSO 13804 fuel pump is specifically built for the SeaDoo GTI LE RFI 2004-2005, along with other RFI models. It delivers over 20% more flow at 43 psi compared to the stock OEM pump, which means your engine gets the fuel it needs under all operating conditions, from idle to wide-open throttle. The pump is designed for both gasoline and E85/ethanol blends, giving you flexibility in fuel choice. Every KEMSO pump is individually tested for flow and performance under a strict Quality Control Program that meets ISO/TSO standards. The kit includes everything you need for installation: the fuel pump, four gradient-density fuel strainers to cover all models, a flex hose, rubber base, tank seal, aluminum fitting pipe, Viton O-ring, wiring connector, and metal clamps. KEMSO stands behind its products with a lifetime warranty, giving you total peace of mind. When you compare KEMSO to cheap unbranded aftermarket units, there is simply no comparison. Many cheap suppliers have little or no quality control program, no individual pump testing, and no published flow testing results. KEMSO pumps are built to last and perform, making them the smart choice for your SeaDoo.

Visit KEMSO Racing today to order your replacement fuel pump:
https://www.kemsoracing.com/

Cost to Replace the Fuel Pump on a 2004 SeaDoo GTI LE RFI

Here is a realistic breakdown of what you can expect to spend:

 

As you can see, the aftermarket pump-only kit is by far the most cost-effective option, especially if you are comfortable doing the work yourself. At roughly $80 for a KEMSO pump that outperforms the stock Bosch unit, the savings are substantial.

Preventing Future Fuel Pump Failures

A fuel pump fails for a reason. Common causes include contaminated fuel, water in the tank, running the tank low repeatedly, and electrical issues. Here is how to extend the life of your new pump:

Keep the Tank Full.
The fuel pump is cooled by the fuel that surrounds it. Running the tank low exposes the pump to heat and allows debris to be picked up more easily. Keep the tank at least half full whenever possible.

Inspect the Fuel Filters.
The RFI system has both an internal filter (attached to the pump) and an external filter in the fuel line. The internal filter does not require replacement under normal operating conditions, but it should be replaced if it is permanently clogged or damaged. When you have the module out, it is cheap insurance to replace the internal filter.

Watch the Electrical Connector.
A worn or corroded connector can cause voltage drop, which makes the pump work harder and run hotter. If the connector shows heat damage, melting, or discoloration, replace the connector pigtail. Many repeat failures are caused by voltage drop at a worn connector rather than a defective replacement pump.

Keep Contaminants Out.
If you ever find debris or water in the tank, clean it out completely before installing a new pump. A partially clogged filter can overwork a new pump and cause premature failure.

Frequently Asked Questions

Can I use a fuel pump from a different SeaDoo model?
Yes, in many cases. The 2004 GTI LE RFI shares the same fuel pump module with the GTX RFI (1998-2002), GSX RFI (1999-2001), GTI RFI (2004-2005), and several 4-TEC models through 2007. The compatible OEM part numbers include 270600089, 270600029, 270600003, 270600015, 270600041, 270600056, 270600087, and 204560418.

Is the aftermarket pump as good as the OEM Bosch pump?
A quality aftermarket pump from a reputable brand like KEMSO can actually outperform the stock pump. The KEMSO pump delivers over 20% more flow at 43 psi, which provides a safety margin for fuel delivery. However, you must be careful about cheap, unbranded pumps. Some aftermarket pumps draw excessive amperage, which can overload the rectifier and damage the charging system. Stick with brands that publish their flow and pressure specifications and have a quality control program in place.

Do I need to replace the fuel filters when I replace the pump?
It is highly recommended. The RFI system has an internal filter inside the module and an external filter in the fuel line. If the pump failed due to contaminated fuel, the old filters are likely clogged. Installing new filters with the new pump ensures the new pump is not strained by restricted flow.

How long does the replacement job take?
The actual pump replacement inside the module takes 20-30 minutes once the module is removed from the tank. The removal and reinstallation of the storage bin and module adds another hour or two for a first-timer. Plan for about two to three hours total.

Final Thoughts

The 2004 SeaDoo GTI LE RFI is a well-built watercraft that delivers years of reliable service when properly maintained. The fuel pump is the one component that is most likely to fail over time, simply because it is an electric motor running continuously under high pressure in a harsh environment. When it does fail, the problem does not have to be expensive or difficult to fix. With basic hand tools, a quality replacement pump like the KEMSO 13804, and the steps outlined in this guide, you can have your SeaDoo back on the water in a single afternoon. The key is to diagnose the problem correctly, choose a quality replacement part, and take the time to install it properly. Do not risk your safety or your watercraft with a cheap, unbranded pump. Visit KEMSO Racing at https://www.kemsoracing.com/ to get a high-performance, OEM-replacement fuel pump backed by a lifetime warranty, and get back to enjoying your time on the water.