Setting the Float Level on a Holley Carburetor

Here is how to set the float level on a double pumper Holley 750CFM. You only need two tools, a screwdriver and a 5/8 open end wrench. It is simple to do, but make sure you watch for any gas spillage from the fuel system. You can do it with the car running or not running, but I prefer to do it when it is running and on a level driveway. Make sure you check your carburetor manual to know if the float level should be at the bottom or middle of the window.
#diy
#holley
#carburetor
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All videos are for entertainment purposes only. Attempt these projects at your own risk! If you do, make sure you follow all manufacturers instructions!

[@marcuskay739]

All the Brawler instructions I have seen ask for the fuel level to be midway on the site glass.

[@SmackeysGarage]

It's probably a good note to check your instructions for your specific carburetor at where the level should be. Some should be at the middle of the window, others should be at the bottom. Thanks for calling this out. I'll pin this comment!

[@bobdimartino6738]

@@SmackeysGarage my brawler says halfway as well

[@BPattB]

I like how when I search stuff about my new carb Andy and your videos always 1 and 2 lol. Anyway my fuel level is at the top of the window on both sides. My fast idle is at 1700 rpm. So one thing at a time. Fuel blow level first then fast idle speed. Good times lol

[@SmackeysGarage]

Ha, that is funny. I guess we either have the best content answers or it knows your history and what you like to watch!

[@timwindsor03]

Very informative video brother. Thanks for sharing. Keep the content coming. Hope you have an incredible weekend. Much love and RESPECT

[@SmackeysGarage]

Thanks Tim, Hope you have a great weekend as well! It's just beginning!

[@musclecarmitch908]

Great video and information!👍

[@SmackeysGarage]

Thanks Mitch!

[@turbotom416]

👍keep moving forward.

[@SmackeysGarage]

Thanks!!!

[@KB19910]

I have a gremlin with a 383 stroker. It starts runs then dies going down the road. Have to let it sit a couple mins and it starts runs then dies again. Could it be a float problem?

[@davidswift541]

I had to do this to a brand new out of the box 4160 carb. Couldn't get any fuel in the bowels. Doesn't sound flow tested to me Holley, but I am a noob so... Good video. thanks.

[@SmackeysGarage]

I also have had weird settings be delivered to me too. Definitely need to double check them out of the box to make sure it works for you. My brawler came with the idle screws 4+ turns out

[@kimmorrison9169]

In my case, I have an older 4150 850 cfm double pumper WITHOUT sight bowls. I assume you then need to remove the FB end the do it while its off the carb?

[@SmackeysGarage]

Do you have a removable plug in that location?

[@kimmorrison9169]

@@SmackeysGarage nothing there other than the 4 idle adjustment screws. 2 on each side

[@tjrene56]

The rear float, I’ve adjusted the same way as the front but it seems to have raised the level???

[@tjrene56]

I’ve heard of floats getting stuck, is that a possibility?

[@SmackeysGarage]

Always a possibility. I typically set it and then let it run for a few minutes before I check the fluid level again. Sometimes it takes some fiddling with to get close.

[@tjrene56]

@@SmackeysGarage if then after it hasn’t dropped level what is the next step to unstuck the float?

[@tjrene56]

I’ve heard of floats sticking, could that have occurred?

[@SmackeysGarage]

It definitely does happen. Stuck down or stuck up.

[@tristenfletcher577]

I have an holley on my boat would you set the float level as the car

[@SmackeysGarage]

Does the engine sit level in the boat? That would factor into how you set the floats.

[@tristenfletcher577]

@@SmackeysGarage it's looks level but I'm sure it probably isn't

[@SmackeysGarage]

@tristenfletcher577 I would set them with the boat in the water level. I’d also keep a fire extinguisher in hand….

[@tristenfletcher577]

@@SmackeysGarage ok thanks

[@big6316]

You described turning the locking nut clockwise or counter clockwise to adjust the float level. I'm brand new to this but that makes no sense at all. I would expect to turn the screw clockwise to adjust the float down and vise versa. Why would you say to turn the wrench to adjust the float level?

[@SmackeysGarage]

Google and read the Holley manual on setting float levels. It’s an adjustment nut and locking screw.

[@big6316]

@@SmackeysGarage In case you weren't aware, people come to your content to see if you can explain the process better than what's available already. My point is that you did not. Yes, I know how to read and use Google.