flooding 4-barrel carb on 84' chevy pickup

Shrubby · 01-17-2005, 04:30 PM

I have a 1984 Chevy pickup truck with a 305 cu. in. engine and four-barrel carb.
Just put in a new cam, lifters, timing chain and gears.
It ran fine except it was getting about 8 mpg.
Had a guy boil out the carburetor and put a kit in it with a new choke puller and float. The carb's back two barrels were hanging up before the overhaul.
The truck runs great for about 30 minutes but then begins to flood out like the float is sticking or the float is set too high.
Found out the air cleaner snout butterfly wasn't opening so I unplugged the vacuum to it to keep it open.
It only seems to flood after the engine is warmed up.
Gas drips from the right side of the carb around the throttle valve stem.
Any other ways to improve the gas mileage without a complete overhaul?
I'm taking the carb back to the mechanic to see about the float.
The air screws are adjusted about two turns from all the way in.
By the way I keep my foot out of the four barrel when driving.
Thanks in advance.
Shrubby
P.S. Fourteen readers and no replys. Doesn't anybody remember carburetors? Or, have I anwsered my own question?

calgary_redneck · 01-20-2005, 02:39 PM

Quote:

Originally Posted by Shrubby

I have a 1984 Chevy pickup truck with a 305 cu. in. engine and four-barrel carb.
Just put in a new cam, lifters, timing chain and gears.
It ran fine except it was getting about 8 mpg.
Had a guy boil out the carburetor and put a kit in it with a new choke puller and float. The carb's back two barrels were hanging up before the overhaul.
The truck runs great for about 30 minutes but then begins to flood out like the float is sticking or the float is set too high.
Found out the air cleaner snout butterfly wasn't opening so I unplugged the vacuum to it to keep it open.
It only seems to flood after the engine is warmed up.
Gas drips from the right side of the carb around the throttle valve stem.
Any other ways to improve the gas mileage without a complete overhaul?
I'm taking the carb back to the mechanic to see about the float.
The air screws are adjusted about two turns from all the way in.
By the way I keep my foot out of the four barrel when driving.
Thanks in advance.
Shrubby
P.S. Fourteen readers and no replys. Doesn't anybody remember carburetors? Or, have I anwsered my own question?

You hit it on the head with a float problem. pull the lid of the carb and check the float drop and look to see if there is any dirt sitting at the bottom of the float boul.
Also check to make sure the choke is opening completely when the engine is warm how ever I'm pretty sure that you will find the float to be your calpret

calgary_redneck · 01-20-2005, 02:52 PM

Quote:

Originally Posted by Shrubby

I have a 1984 Chevy pickup truck with a 305 cu. in. engine and four-barrel carb.
Just put in a new cam, lifters, timing chain and gears.
It ran fine except it was getting about 8 mpg.
Had a guy boil out the carburetor and put a kit in it with a new choke puller and float. The carb's back two barrels were hanging up before the overhaul.
The truck runs great for about 30 minutes but then begins to flood out like the float is sticking or the float is set too high.
Found out the air cleaner snout butterfly wasn't opening so I unplugged the vacuum to it to keep it open.
It only seems to flood after the engine is warmed up.
Gas drips from the right side of the carb around the throttle valve stem.
Any other ways to improve the gas mileage without a complete overhaul?
I'm taking the carb back to the mechanic to see about the float.
The air screws are adjusted about two turns from all the way in.
By the way I keep my foot out of the four barrel when driving.
Thanks in advance.
Shrubby
P.S. Fourteen readers and no replys. Doesn't anybody remember carburetors? Or, have I anwsered my own question?

You hit it on the head with a float problem. pull the lid of the carb and check the float drop and look to see if there is any dirt sitting at the bottom of the float boul.
Also check to make sure the choke is opening completely when the engine is warm how ever I'm pretty sure that you will find the float to be your calpret

enginetune · 01-22-2005, 02:05 AM

I would go with a float problem. If you still have a Rochester, Set the float a little bit lower than spec. I always set them 1/8 lower and never had trouble. Too low will starve for gas at high RPM and too high will flood the carb, worse when warm for some reason. And then change the oil again.

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