Won't stay running

Hey guys I have an buick 455 just been fully rebuilt.
New carburetor and it will not stay running
It will crank and run only for a second
To get it to do that is give it some gas turn the key over and it will start
To me seem like it's starving for gas
The carburetor is full with gas middle of the site glass
5 psi of fuel
And timing seem to be close or correct

 

What kind of ignition system is it?

Sort of sounds like the bypass to high voltage for the points gets it to fire, but when you let go of the ignition switch, the resistance wire isn't connected...

 

Sounds plausible.

Relly, what voltage do you show across the coil with the key on but not cranking?

 

To check that issue, temp run a wire from battery to coil". If it runs, look at the resistance wire. If it doesn't, you got other things to look at...

 

This could be the coil or this one will get you if you have points and that is the condenser

 

Check your "S" terminal wire on the solenoid. If loose will do this. It's free and takes a couple seconds. Had it happen once to me.

 

Hei ignition system

 

Thanks trunkmonkey
I got it to run by straight wire to the battery
Now how can I fix it right
What u think I have wrong
Thanks again

 

Did it run with the HEI prior? Check your wire feeding the coil and make sure it is 12 volts.

 

Check power wire (disconnected) to the coil with key in RUN position and note the voltage.
Then with the meter still connected, crank the car and see note what the voltage is and post back.

It could be the ignition switch.

Is it in the Monte? If so, going to need some info on wiring and mods for the swap.

Are you using an ignition box? Or just a in cap HEI?

 

Yes it's in the monte
The wiring was already set up when I purchased the car
It's set up with a ford solenoid

 

Is the HEI just direct 12v or are you using any ignition control box?

 

Direct no ignition box

 

Disconnect the power wire at the coil, and with the key in RUN position and see what the voltage reads.
Then with the meter still connected, crank the car and see note what the voltage is and post back.

 

The "S" terminal engages the starter so that it cranks.

You mean the "R" terminal, which bypasses the ignition resistor.

But of course, with an HEI there is no ignition resistor, and the "R" terminal either won't exist, or won't have wires run to it.

 

Since it starts and runs with a wire direct from the battery to the coil, it is a key on "RUN" issue.

Since it is a "swap", sorting the source where the power to the coil is coming from.

Is it triggered by relay from ignition switch, or what?

OP is going to have to dig in and figure the wiring out, since there is no telling how much "modding" has been done.

I was trying to verify if he has voltage in the "RUN" position and how much, and then the same for "Start", but I suspect the "Start" position is fine, since he can start it.