Fuel Dampener
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.
