Sierra 18-7789 OMC Spin-On Fuel Filter Element, 21 Micron
- Brand:
- Sierra
- Part no:
- 18-7789
Image: Sierra
Where to buy
Specifications
- Fuel
- Gasoline
- Micron rating
- 21 micron
The Sierra 18-7789 is a replacement spin-on fuel filter element rated at 21 microns, made to cross to OMC part 502906 for inboard and outboard gasoline engines. Sierra gives OMC as the original maker and 502906 as the OEM part number, and marks the element for gasoline use. That 21 micron rating is the only filtering figure given for it.
Our take
Its 21 micron rating and gasoline use describe a straightforward spin-on replacement for OMC 502906 on inboard and outboard engines. Check your engine's OEM part number against 502906 before swapping it in.
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.