If you own a Porsche and need part number 298-609-403, you likely already know it’s a specific OEM component. This guide explains what this part is, which models it fits, its function, and how to source a genuine replacement. Whether you’re a DIY owner or working with a shop, understanding this part helps you make an informed purchase.
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What Is Porsche Part 298-609-403?
Part number 298-609-403 is an original Porsche part used in the fuel system of several models. Specifically, it is a fuel supply unit or fuel pump module that sits inside the fuel tank. This assembly includes the electric fuel pump, fuel level sender, and necessary hoses and connectors. It delivers fuel from the tank to the engine at the correct pressure and volume.
This part is critical for engine performance. A failing fuel pump can cause hesitation, stalling, hard starting, or loss of power. Replacing it with the correct OE part ensures reliable operation and proper fitment.
Which Porsche Models Use Part 298-609-403?
Part 298-609-403 is primarily used in:
- Porsche 911 (997 generation) – C2, C4, S, and Turbo variants (model years 2005–2012)
- Porsche Cayman (987 generation) – Base and S (2006–2012)
- Porsche Boxster (987 generation) – Base and S (2005–2012)
It fits both manual and automatic transmissions. The part is specific to left-hand drive and right-hand drive models, but always double-check with your VIN before ordering. Some earlier or later model years may use a different suffix (e.g., 298-609-403-xx), so confirm compatibility.
How to Confirm Fitment
To verify that 298-609-403 is the correct part for your car:
- Check your VIN – Enter it on a Porsche parts website or ask a dealer.
- Inspect the old part – If you have the original, compare the part number visible on the pump housing.
- Model year – Cross-reference with the range above. If your car is a 2008 911, this part fits.
Function of the Fuel Supply Unit
The fuel supply unit (part 298-609-403) performs two main jobs:
- Fuel Pump: Electric pump that draws fuel from the tank and pushes it to the engine at regulated pressure (typically 3–5 bar depending on model). It runs whenever the engine is on.
- Fuel Level Sender: A float mechanism that measures fuel level and sends a signal to the gauge. When the sender fails, you may see inaccurate fuel readings or a stuck gauge.
Because both components are integrated into one module, replacing the entire unit is common when one fails, especially as they age (10+ years).
Signs You Need a New Fuel Pump Module
If you experience any of these symptoms, part 298-609-403 might be failing:
- Engine cranks but won’t start (no fuel pressure)
- Sputtering or hesitation at high speeds
- Loss of power under load
- Whining noise from the rear of the car (pump noise)
- Fuel gauge reads empty or fluctuates erratically
- Check engine light with fuel pressure codes (P0087, P0089, etc.)
If you suspect a pump issue, test fuel pressure with a gauge. If pressure is low or zero, the pump likely needs replacement. Also, if the sender is faulty, the gauge won’t read correctly.
Buying the Right Part: Genuine vs. Aftermarket
Genuine Porsche Part 298-609-403
Buying an OEM German-made part ensures perfect fit and long life. It comes with the correct pump pressure, sender resistance, and connector. The price is higher—typically $400–$600—but it’s a plug-and-play replacement.
Aftermarket Alternatives
Some brands offer fuel pump modules that cross-reference to 298-609-403. These are cheaper (around $150–$300) but may vary in quality. Common aftermarket brands include Bosch, VDO, and Delphi. If you choose aftermarket, opt for a known brand. Some cheap units fail quickly or have poor sender accuracy.
Where to Buy
You can purchase part 298-609-403 from:
- Porsche dealerships – Full price but guaranteed genuine.
- Online parts retailers (e.g., Pelican Parts, FCP Euro, ECS Tuning) – Genuine and aftermarket options, often with warranties.
- Independent mechanics – They can source it for you.
Always avoid units sold as “used” unless verified to be in perfect working order. Fuel pumps wear internally, so a used one may have limited life left.
Installation Considerations
Replacing the fuel pump module is a moderate DIY job if you have mechanical skills. The part sits inside the fuel tank, accessible through an access panel under the rear seat or trunk floor (depending on model). Steps include:
- Relieve fuel system pressure.
- Disconnect battery.
- Remove access cover.
- Disconnect electrical connector and fuel lines.
- Remove locking ring and lift out old module.
- Transfer any bracket or seal if needed.
- Install new module, replace O-ring, tighten locking ring.
- Reconnect lines and connector.
- Test for leaks and function.
If you are not comfortable working with fuel, have a professional install it. The risk of fire or damage is real. Always use a new O-ring (often included with the pump).
Practical Recommendation
For most owners, buying the genuine Porsche part 298-609-403 is the safest choice. The investment pays off in reliability and correct fuel gauge readings. If budget is a concern, a Bosch or VDO aftermarket unit is acceptable, but verify it comes with a warranty and matches the sender resistance (typically 0–90 ohms for Porsche). Avoid no-name brands.
Before purchasing, confirm the part number suffix. Porsche often revises parts, so 298-609-403 may be superseded by 298-609-403-01 or similar. Check with the seller to ensure the latest version is compatible.
If you need help finding the part, contact a Porsche specialist or use your VIN to look up the correct part on a reputable parts website. Replacing a failing fuel pump restores performance and peace of mind.