Re: What's the relationship between float setting and rich/lean mix ?

Posted by ScottyNY About half ;) on September 30, 2002 at 16:01:23 from (151.202.182.234):

In Reply to: What's the relationship between float setting and rich/lean mix ? posted by Amateur Mechanic on September 30, 2002 at 15:40:54:

I'm an amateur m'self, so the pros can expand and correct what I say but your mixture screw is more critical to the lean/rich mixture than your float. All the gas that gets to your engine goes past both. With gravity feed systems, there's not a lot of pressure (just the gravity) in your fuel line. The engine vacuum pulls the gas through. If you're reasonably close to specs on float hiehgt it shouldn't affect things much. WIth a fuel pump it's a whole other story. A stuck open float allows the bowl to fill and put the pressure from the pump directly into your mix screw. Properly adjusted, the float in either case opens with the float high enough to let gravity or the pump put gas into the bowl before the vacuum has sucked it dry, and to shut off before the bowl is so full that pressure from the fuel line (gravity or pump) starts forcing gas through the screw or filling the bowl faster than the engine vacuum can draw it through. Floats stuck open will usually cause flooding and excess gas dripping from any available opening. If you're just running rich, I'd tinker with the mixture screw before I openend up the bowl and float.

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