The needle check valve is located at the outlet for the accelerator pump. At higher RPM (especially in 4cyl engines) there are a lot of harmonics that can cause this needle valve to bounce in the screw. This bouncing will cause fuel siphoning that will rob power from your engine and cause major tuning issues. This new check valve kit comes with a heavier needle valve to help eliminate fuel siphoning caused by the stock needle valve bouncing in the screw.
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