The K&N 81-1011 is a replacement stainless steel mesh element rated at 100 micron, with a 1.688 in outside diameter and a 5.625 in length. The manufacturer designed it to replace the internal filter in K&N's inline fuel/oil filter housings, so you can renew filtration without buying a complete anodized aluminum unit. It is intended for racing use and works with a range of oils and fuels, including methanol.
The coarser 100 micron mesh is the least fine option in K&N's 25, 40, 74, and 100 micron replacement lineup, which generally means less flow restriction at high fuel demand, though fine filtration is reduced. The manufacturer positions the inline line for NASCAR, drag, sprint car, marine, and custom racing, and lists the housings at pressure ratings up to 205 psi with flow up to 18 gpm. This element suits a track build that already runs a compatible K&N housing and needs a dependable, reusable-style replacement for alcohol or methanol service.
Fitment is universal rather than tied to a specific vehicle, so confirm the housing before ordering. The manufacturer states this element does not fit the 81-1000 or 81-1001 housings. The manufacturer lists installation at 20 to 30 minutes. Search terms: 100 micron stainless inline fuel filter element, K&N 81-1011 replacement element, methanol race fuel filter insert, inline fuel filter element for drag car.
It is not a vehicle-specific part. The manufacturer lists it as a race-only replacement element for its inline fuel/oil filter housings, so compatibility depends on the housing you already have installed.
The manufacturer states that these replacement elements do not fit parts 81-1000 or 81-1001. Confirm your housing part number with the manufacturer before ordering.
The manufacturer says these elements can be used with a variety of oils and fuels, including methanol.
The manufacturer lists installation time at 20 to 30 minutes. Because the element sits inside a pressurized fuel line, relieve fuel system pressure and disconnect the battery before opening the housing, and keep fuel away from ignition sources. Confirm the flow direction with the manufacturer before reassembly, since flow orientation details vary, and check the seals and fittings for leaks after you prime the system.
