When I accelerate hard around corners or try to launch the car stalls and dies. My first thought was the mechanical pump that I have had failed so I replaced it. Had the same problem. In hope I installed an electric fuel pump back by the tank it worked better for a little while but then failed. Thinking a more costly pump would fix the issue I bought a Holley mechanical pump and installed it no change. I checked the fuel filter thinking it was clogged and replaced it, with no change. However, the filter isn't even half full and when I get on the throttle the filter drains. I know that the lines are clear as I had to replaced my fuel sending unit and thought it a good idea to flush them when I had the tank out. The only other thing I can think of is my fuel that I have from the mechanical pump to the carb is half 5/16 steel tube and half rubber hose. Could the heat from the engine be vaporizing the fuel halfway up the line?

 

Wrong question. The carb is the problem.

 

ok then, what is wrong with the carb? it is a #1406 600cfm edlebrock carb which is pretty standard for 289's. is it floats? jets? what?

 

Check the float levels first, or blockage of the needle and seat.

And if the rubber line bothers you, get one that is all steel up to the carb inlet, with only about 2" of hose. Glazier's should stock them, they made the pattern for the manufacturer.

 

600 is big for a 289 unless it's got an aggressive cam. I have a 600 on my mean 331.

Definitely check the float levels. Even in proper tune, my car will die in hard (faster than you should be going safely) corners at idle. I've heard this is a common issue with Edelbrocks. I've tried raising the float level, richening the idle mix, nothing's made it go away completely.

You probably also need to adjust the stepup springs, accelerator pump, and rods/jets. A 600CFM Edelbrock proably isn't going to be properly set up out of the box for your 289. It's too big for that motor so the vacuum signal is going to be less than ideal, especially at low rpm's. You'll have to adjust for this.

 

True that. "More is better" is definitely NOT true of carburetors. An internally stock 289 or 302 will run MUCH better with a 500 than a 600. Heck, the 4300 4V used on the 67-68 289/302 was 441 cfm.

 

I've been checking, and it's also possible the stumble or stall, especially in corners, can be caused, in Edelbrock carbs, by fuel pressure being too high.

 

So you might try making a homemade fuel pressure regulator with a band clamp on the rubber fuel line. If that fixes it then either get a fuel pressure regulator or a fuel pump that pumps at a lower pressure.