Fuel+Dampener

toc A **fuel dampener** (sometimes called a **fuel damper**) is a device that dampens (or softens) pulsations in the stream of fuel caused by the fuel pump. This is to reduce hydraulic "noise" in the fuel rails and provide a smooth stream of fuel to the injectors--the constant pulsating caused by the fuel pump would otherwise create a slight "ripple" effect inside the fuel system which could potentially disrupt adequate flow of fuel to the injectors.

The fuel dampener consists of a diaphragm and spring, similar to a fuel pressure regulator. However, it does not regulate pressure, and the vacuum-adjustable diaphragm assembly exists to act as a variable "shock absorber," so it can absorb pulsations in the fuel without impeding the flow of fuel to the rail.


 * Note**: While similar in appearance, the fuel dampener should not be confused with the Fuel Pressure Regulator.

Location


**Versions**
 * Like the fuel pressure regulator, original, from-the-factory fuel dampeners were painted black.
 * Replacements are either zinc plated (light-gold colored) or nickel plated (light-silver color). Original fuel dampeners should be replaced at the owner's (or the car's...) earliest convenience, as they've now carried fuel for about 20 years.
 * NA and TT fuel dampeners are interchangeable, provided that they're both in good shape. They are the same part.

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Parts (Category) Electronic Fuel Injection (Category) Fuel System (Category)