Ok. 79 f150 4x4 460 .60 over. Stock fuel pump. Edelbrock 600 cfm. Problem is..... It starts and runs fine. But if you shut it down and start up a few minutes later, it acts like it's not getting enough fuel if you get on it a bit. Also maybe separate problem, after sitting for a few days, all the fuel goes back to tank and it takes a bit to build pressure back up. Help is greatly appreciated and thanks in advance.

 

Someone else will provide better input, as I don't know a whole lot about those carbs, but here is my initial response.

The carb should be big enough to handle that motor. Were you running this carb before the rebuild?

I would try adjusting your slow speeds and see if it improves, and as for the fuel running back out, maybe the seats? Maybe a bad gasket?

Can you smell gas after you shut it off, or does it just leak back through the line, or into the intake?

Again, I hope someone else can provide some advice as well.

 

Same carb before rebuild. Honestly I have smelled gas before after shutting it off. Haven't seen anything leaking though. Also to me it appears the gas is going back to the tank. I have a clear filter close to carb and have noticed it is empty after setting awhile. I have a company vehicle so it's not my dd. thinking about getting an electric pump. I'm sure that would solve at least one problem.

 

Here is what happens: Fuel in bowl gets hot and vaporizes. Fuel also evaporates so that is why the need for all the cranking. If there is no spacer, add a carb spacer, phenolic is best but anything would help, also, get a lower temp thermostat. also, get an aluminum intake if budget allows. With all of this nice gasoline we buy today, that turns into vapor before our engine has a chance to burn it, thus creating the vapors. This is because of hydrocarbon in the fuel, or lack there of, and allowing for a vapor to boil out of the carb. Also, edelbrocks with their integrated float bowl design are notorious for this so a holley will actually help due to the float bowls being exposed on the ends and bigger, more area for air to cool the fuel.

 

You sir are brilliant. I think that may be it. I never had this problem till I changed my intake due to stripped water neck problems. I have a weiand stealth now I had initial problems after install. So I rebuilt carb and didn't put spacer back on. I was worried about clearance issues. I had to put a smaller breather on it due to clearance. I am looking into a Holley for it. But will definitely check if I can get my spacer back on. It's not my dd but damnit I want the thing to go. Thank you all for your help. Will repost when I put spacer back on.