CP4 Metering Valve Bypass Kit – VW TDI

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Protect your fuel system from a known failure point.

If you’ve got a VW TDI with a CP4 pump, you’re probably already aware of the risk. These pumps rely on clean diesel to keep the internals lubricated. But when bad fuel or even a little air sneaks into the system, the pump can start wearing itself out from the inside. That wear turns into metal particles — and once that hits your injectors, rails, or tank, it’s game over.

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That’s why I built this kit. The CP4 metering valve bypass kit adds a critical layer of protection. It takes the return fuel coming off the pump — the stuff most likely to be contaminated if something goes wrong — filters it, and sends it back to the tank. At the same time, it ensures only clean fuel is fed to the high-pressure side of the system. It won’t stop the pump from failing, but it will help stop a failing pump from taking out your entire fuel system.

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What You’re Getting:

• A clean, filtered fuel path to the high-pressure system

• Isolation of contaminated return fuel before it can cause damage

• Added protection for your injectors, rails, and tank

• A simple, effective solution you can install in an afternoon

• Peace of mind every time you start the car

 This kit is affordable, easy to install, and it works. Whether you're stock or tuned, this is one of the best ways to protect your TDI from a costly breakdown.

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                      Have questions?      Feel free to reach out — I’m happy to help.