Not Idling

[climberman]

1966 chevy truck 350 engine two barrel very old. It won't stay running you have to keep pumping the gas or it dies.

[geezer#99]

Choke working?

[climberman]

No choke but it is wide open

[geezer#99]

You need a choke!
Choke gives you a richer mixture.
Won’t idle because it’s too lean.

What’s on it now?
A pic would help of the choke side.

[VETTE10R]

What is the timing at? I dont have a choke on mine and I was having issues with how it ran, I advanced the timing to 10° and it starts right up idles great and runs great.

[Bushman66]

Originally Posted by climberman

1966 chevy truck 350 engine two barrel very old. It won't stay running you have to keep pumping the gas or it dies.

Need more information. Won't idle when cold, or after warmed up? Timing and ignition components in good shape and working properly? Is the gas fresh? Has it been sitting for a long time? etc.

[climberman]

Won't even stay running unless you keep pumping the gas cold or hot. Not just at idle

Every thing is new only 10 thousand on the motor but will check the timing.

Fresh gas just filled up we use the truck every day. It ran great yesterday just started doing it this morning.

The carb is old and it was a rebuild

[VETTE10R]

Does it have a fuel filter?

[climberman]

yes and it looks clean

[VETTE10R]

Make sure the fuel pump is pumping fuel, check you cap and rotor for corrosion etc... ryn through all the basics if you haven't yet...

[geezer#99]

Originally Posted by climberman

Won't even stay running unless you keep pumping the gas cold or hot. Not just at idle

Every thing is new only 10 thousand on the motor but will check the timing.

Fresh gas just filled up we use the truck every day. It ran great yesterday just started doing it this morning.

The carb is old and it was a rebuild

That info says ‘big vacuum leak’!

[Bushman66]

You say the carb is old, that is the first thing I would suspect if ignition and timing check out. Might be the accelerator pump or needle and seat. The fact you can keep it running by goosing the throttle steers me away from the fuel pump. Have you checked the plugs to see how they look? Might be fouled?

If all of those things check out, I'd probably pull the carb and toss a rebuild kit into it. Modern fuel is murder on old carbs...

[climberman]

Thanks Bushman

That is what I was thinking and I have wanted to put a 4 barrel on it for some time I have the intake but not the carb. I took it to the garage I use a lot and they are going to make the change for me. I didn't want to do it myself just to busy right now.

I appreciate all the help here on the forum

[geezer#99]

New intake eh!
Which one?
What carb?

[Chevy Fleetside]

Check for vacuum leaks. Sometimes carbs come loose.

[garyd1961]

New motor with old carb? I would get the carb rebuilt or buy a new one. It may not be the problem but why run a new motor with an old carb.

[YoungPup1977]

The 350 engine has 10k miles on it and the two barrel was rebuilt. One day it was running fine, the next day it wasn’t Have you provided a pic of the engine ? Any vac hoses come loose ?

[garyd1961]

He didn't say the carb was rebuilt. He said the carb was really old and was a rebuild. It sounds to me like he is saying it was a rebuild carb that he has had for a very long time.

[cadillac_al]

I wonder if it's still running points. Those usually need some attention.

[YoungPup1977]

Originally Posted by garyd1961

He didn't say the carb was rebuilt. He said the carb was really old and was a rebuild. It sounds to me like he is saying it was a rebuild carb that he has had for a very long time.

Sounds like its a mute point at this time since he is changing the intake and going with a 4 barrel carb. He has the intake but not the carb and the vehicle is already at the garage he uses alot
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