alright here goes

when i decide to give my car hell, it seems to spit and sputter at around 4500 rpm for a second or two and then it will pick back up and start screaming down the road again. the weird part is that is doesnt do this everytime, id say its about half the time. i have a feeling that its a carb problem, being that this is the first engine ive built and i know jack about carb tuning. by the way its a edel 750 vs.

any suggestions would be appreciated

thanks

 

I had this problem a while back, traced it down to fuel starvation. I replaced the stock fuelpump and fuel regulator with a holley red and never had the problem since. This is on a carbed engine but if your running tbi or tpi it propably is fuel pressure related too..

Hope this helps,

Peter

 

hmmmm fuel starvation huh? My car is doing this also...only have 5psi fuel pressure BUT I can jack it up alittle. Or I could run the vaccum line to the mallory FPR. I have a 305 intake fuel pump which i dont want to change out just yet...its a PITA

 

TBI305Camaro:
How are you getting the fuel to the pump? Did you take out the stock pump in the tank? Before I got my problem fixed I had the holley red in the engine compartment for a lillte while, it still did the same thing but not as much. Also the fuel return line is thicker than the regular fuel line going to the tbi, if you havent already you could switch over to that one. Now my HR pump is where the fuel filter sat. Its been working perfectly for about a year now.

Pete

 

hmmm right now im running the intank pump. car was originally tbi so the intank should be putting out plenty of pressure. think maybe that my floats are too low?

 

Your problem might in this case be too much fuel pressure. The TBI fuel pump puts out 13-15 psi pressure. If your feeding that directly to the carb it wont be able to keep the float level right. Do you also have a pressure regulator before the carb? If you do it might be time to get a new fuelpump....

Pete

 

yeah ive got a regulator on it and if i let it run wide open itll put out around 12psi or so, and thats way more than im needing correct?

 

Correct, the carb doesnt really like much more than 5 psi. When i did the stock pump + fuel pressure regulator thing it didnt work to well. I bet ya thats your problem,

Pete