Sierra 18-7844 Spin-On Fuel Filter Element, 21 Micron
- Brand:
- Sierra
- Part no:
- 18-7844
Image: Sierra
Where to buy
View on Amazonpaid link
Specifications
- Fuel
- Gasoline
- Micron rating
- 21 micron
The Sierra 18-7844 is a short spin-on fuel filter element, rated at 21 microns. It is sold as the element only and corresponds to Mercury OEM number 35-802893Q. It is a replacement element for inboard and outboard gasoline engines, so it is meant for gasoline systems rather than diesel.
Our take
This is a short, 21 micron spin-on element only, so it replaces the filtering part of a filter you already have rather than bringing its own mount. It is listed for gasoline engines, inboard and outboard.
From our buying guide
Parker lists Racor's marine Turbine Series for diesel and biodiesel engines, and Racor says gasoline filters in an enclosed location should use a metal bowl. A micron rating means little without its efficiency.
Check before you buy:
- The efficiency is stated with the micron size. Racor labels its finest element 2 micron and rates it at 98% at 4 microns.
- You know your engine's change interval, since intervals are per model.
- You can fit it on the suction side of the fuel transfer pump, where Racor says to install its 900MA and 1000MA, since pumps emulsify water.