Edel AFB Stumble..

Robert Simpson · 07-05-2009, 09:28 PM

I have been fighting a stumble and I am out of ideas. I have a 750 Edelbrock AFB on my street car that I am now going to start bracket racing. It drives fine but, when I built up against the converter (1800) then floor it, it stumbles bad and then may catch up and take off. It is a real simple combo. 1970 Nova 307/ turbo 350, 2000 stall. It has run high 14's and I am happy with that considering the combination. But, I have updated the heads, cam and intake and while it drives fine and runs alot stronger than before I can't get rid of this stumble. I have a good fuel pump with a regulator set a 5.5pds, I have raised and lowers the floats, set the accelerator pump to the most aggresive setting. Changed the rods, springs etc, set the initial timing as high as I want to set it, all with the same results. I could use any advise about this carb. Thank You

Robert Simpson

GTX JOHN · 07-06-2009, 01:16 AM

On our cars it is usually an accelerator pump issue. Be sure that when you are a t stall speed you leave line there is plenty of squirt left. .. .adjust by bending rod on pump.

07-05-2009, 09:28 PM	#1
Robert Simpson Senior Member Join Date: Aug 2004 Location: Jacksonville, Florida Posts: 808 Likes: 7 Liked 20 Times in 12 Posts	Edel AFB Stumble.. I have been fighting a stumble and I am out of ideas. I have a 750 Edelbrock AFB on my street car that I am now going to start bracket racing. It drives fine but, when I built up against the converter (1800) then floor it, it stumbles bad and then may catch up and take off. It is a real simple combo. 1970 Nova 307/ turbo 350, 2000 stall. It has run high 14's and I am happy with that considering the combination. But, I have updated the heads, cam and intake and while it drives fine and runs alot stronger than before I can't get rid of this stumble. I have a good fuel pump with a regulator set a 5.5pds, I have raised and lowers the floats, set the accelerator pump to the most aggresive setting. Changed the rods, springs etc, set the initial timing as high as I want to set it, all with the same results. I could use any advise about this carb. Thank You Robert Simpson

07-06-2009, 01:16 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,802 Liked 2,486 Times in 697 Posts	Re: Edel AFB Stumble.. On our cars it is usually an accelerator pump issue. Be sure that when you are a t stall speed you leave line there is plenty of squirt left. .. .adjust by bending rod on pump.