The small 1/8" bleed hoses on a Mercury V6 two-stroke do a big job. They route fuel/oil mixture and crankcase “bleed” flow between fittings, check valves, and intake passages so the engine stays cleaner internally and maintains consistent low-speed behavior and holeshot response.
When the tubing hardens, cracks, or loosens, the bleed system can leak air, drip fuel/oil, or lose its intended flow—often showing up as inconsistent idle, loading up, or uneven cylinder behavior on hard-run motors.
The factory bleed line tubing is commonly referenced as Mercury OEM 99130122 and the newer 892024122, sold in 20-foot bulk lengths for cutting to fit.
OEM part numbers, supersession, and cross-references
Mercury catalogs this hose as 32-99130122 (also commonly written without the “32-” prefix as 99130122) and notes it has been superseded to 892024122 (often shown as 32-892024122).
For customers searching by aftermarket interchange, this same bleed hose is commonly cross-referenced to Sierra 18-8048, which lists interchange with 32-99130122 and 32-892024122.\
Hose size and material use in the bleed system
This bleed tubing is typically described as small-diameter “bleeder hose,” approximately 0.090 in (2.3 mm) ID and 0.220 in (5.6 mm) OD, intended for fuel/oil bleed and ventilation routing in marine environments.
Where it’s used
You’ll find 99130122 / 892024122 style bleed tubing referenced in Mercury parts diagrams under “Bleed System” and related crankcase ventilation/bleed routing on many legacy Mercury/Mariner V6 two-stroke platforms.
For the way owners search and build these engines today, this tubing is commonly associated with classic performance and fishing families including 2.0L, 2.4L, 2.5L, 3.0L, and 3.2L Mercury V6 two-strokes and popular model names such as 150 HP, 175 HP, 200 HP, XR4, XR6, 225 Pro Max, 245 HP Carb, 250 XS, 250XB, 260 EFI, 280 ROS, SST-120, S3000, and drag/offshore performance builds.
It is also frequently searched alongside later high-output V6 names such as 300 Pro Max, 300X, and 300XS when owners are refreshing all small fuel/oil/vent tubing during rebuild and rigging work. (As always, confirm by your engine’s serial-number parts diagram and the “Bleed System” callouts.)
When to replace bleed line tubing
Replace bleed tubing any time it is stiff, discolored, cracked, swollen, or loose on fittings. Even if it “looks okay,” older tubing often loses tension and can start weeping fuel/oil at the barb ends. If you are already servicing bleed check valves, injector/carb work, or doing a powerhead refresh, replacing all bleed hoses at the same time is a low-cost way to prevent future troubleshooting.
Installation tips that prevent leaks and kinks
Cut the tubing cleanly with a sharp blade so the ends seat squarely on the fittings. Route lines with smooth bends (no tight kinks), keep them away from sharp edges and excessive heat, and verify every connection is fully seated on the barb. After the first run, recheck for seepage and confirm nothing is rubbing or collapsing under cowling clearance.
Buckshot Racing #77 supplies this bleed line tubing in a continuous 20-foot length, ready to cut to fit, referenced by Mercury OEM 99130122 / 892024122.
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.