Holley 350 can stall out under certain driving turns.

[timk225]

The Holley 350 2 bbl on my 1973 Dusters' 225 has been good, but it has a few quirks. Most notably, if driven a certain way, it'll make it stall out.

One place I go to regularly has a parking lot a couple inches higher than the street. So coming out of the parking lot, it'll have a decent bump down to street level then a hard left turn onto a 2 lane road. And then 100 feet or so later under mild to moderate acceleration, it'll make the engine sputter and stall out, then it'll take a few rounds of pumping the gas and cranking to get the engine running again.

I checked the fuel level in the sight glass with the engine idling today, the fuel level is halfway up the glass.

What causes this stall? I can't imagine the engine is starving for fuel, could it be that with the bump and turn, one side of the carburetor gets flooded or something?

 

[AJ/FormS]

Gas in furel-line from pump to bowl is not pure gas.

 

[Bewy]

The car movement may be causing the fuel to move towards the back of the float bowl. Then the float drops, needle & seat opens, & fuel enters the bowl. Fuel level is now too high & fuel spills out of the booster. High fuel pressure [ pump ] will make it more sensitive. I would lower the fuel level to the bottom of the glass & see if that improves the situation.

 

[Demonic]

Sounds like float or needle & seat issues. Bad float, dirt, something.

 

[LO23M8B]

Most likely a piece of garbage in the bowls. When you accelerate and turn it covers the jet/s then it just flows away when it stalls. It's rare but I've seen it a few times.

 

[timk225]

I can try lowering the float level and see if that makes a difference. It is only in this one location, with the bump down to the street, hard left, and accelerate that it has ever happened. The carburetor is new with only about 500 miles on it, completely new fuel system, pump, filter, etc, with 1800 miles or less. I'm not saying there couldn't be dirt in there somewhere, it's just not like this fuel system has been on the car for 20 years.

 

[LO23M8B]

Last couple of new carbs I've seen have been junk. Pulling the bowl is easy and you can reuse the gasket if you don't tear it.

 

[timk225]

I looked up the Holley flot level setting directions online, and oh yeah, my factory set floats are too high. My carburetor has the clear plastic sight plug, and the fuel was halfway up the window. I lowered it to where you can barely see the gas at the bottom edge, and if I shake the fender gently with the engine running, fuel will splash around inside. I took a good 1/4" off the fuel level.

We'll see what difference that makes. I'll hit it kind of hard coming out of that parking lot next time.

 

[Killer6]

I looked up the Holley flot level setting directions online, and oh yeah, my factory set floats are too high. My carburetor has the clear plastic sight plug, and the fuel was halfway up the window. I lowered it to where you can barely see the gas at the bottom edge, and if I shake the fender gently with the engine running, fuel will splash around inside. I took a good 1/4" off the fuel level.

We'll see what difference that makes. I'll hit it kind of hard coming out of that parking lot next time.

Yep, I say it over & over, once a carb's been handled/shipped.....them floats need checked/reset, new/used/rebuilt or otherwise.

 

[timk225]

In the past couple weeks, I've had the chance to come out of that turn and down that road fairly hard 3 times, no more stalling or sputtering since I lowered the float level.