with Webers)
-
Webers use brass jets and aluminum bodies—they corrode fast in damp air.
-
Spray a light corrosion inhibitor on external linkage and shafts.
-
Plug the carb throat loosely with an oily rag to keep moist air out (don’t seal it airtight).
4. Float bowl reality check
-
Weber marine carbs do not tolerate ethanol residue well.
-
If you skip draining:
-
Expect a stuck needle valve
-
Expect a leaking accelerator pump diaphragm
-
Expect a hard start next season
-
If it sat more than 6 months with fuel in it, plan on at least pulling the top and cleaning jets.
5. Fuel system upstream matters
-
Replace or drain the water-separating fuel filter before storage.
-
Ethanol + water = corrosion + white powder in the carb. That powder plugs idle jets first.
6. Choke and linkage
-
Make sure the choke is fully open before storage.
-
A closed choke plate traps moisture and accelerates corrosion inside the bore.
7. Spring commissioning tip (this saves time)
Before first start:
-
Remove the top air horn (if practical).
-
Verify the float moves freely.
-
Confirm accelerator pump squirts fuel.
-
If it doesn’t squirt—don’t crank endlessly. Fix it first.
Bottom line
A Weber marine carb is a precision carb, not a forgiving one.
Leave fuel sitting in it and it will punish you later. Drain it or stabilize it properly—no shortcuts.
