Demon Carb on 455

[78TA]

I have a race demon 750 cfm Carb on my 455. Need some help tuning it. It will start up and run fine, but while driving it cuts out above 3000rpm and bogs down.

Any demon carb experts out there?

Thanks!!

 

[melsg5]

Did you check the float levels? Is this a vacuum secondary or a double pumper? If vacuum, the secondary spring is too soft. If DP check the secondary accelerator pump to make sure there is no play in the linkage. Have you checked the fuel pressure with a gauge?

 

[78TA]

http://www.demoncarbs.com/2402010OT.asp


This is the carb on the car

 

[melsg5]

OK, it' a double pumper. Do you know they list this as an oval track carburetor? Anyway did you check the secondary accelerator pump to see if it's working? Did you check your fuel pressure to see if it's too low? What kind of transmission automatic or manual? What rear end gear do you have?