The Stovebolt Site Forums The Shop Area Engine Shop ignition problem, will start, run, then dies out both at idle & on the road

A couple of questions D.Lee,
Are we talking about a Sovebolt Six here, or something different?
Stupid question, but has yet to be asked!
New fuel pumps can be an unknown thing with their delivery pressure etc. Especially if you have made the common mistake of running a high volume/pressure mechanical/electric pump on a stock carburettor.
Any pump putting out more than 5-8 psi of delivery will slowly flood a standard carby's float needle and seat shut off pressure.
Also as 41 CHEVY has said, the fine rubber seal of the needle takes very little to fail. Age, New fuels, sitting for periods of time, the smallest amount of junk will all lead to failure.
Do you run a filter between the fuel pump outlet and the carb?????? If not, run out and do it NOW!
Also, don't just look at the needle and seat.Pull it all apart and thoroughly clean the two.Put the unit in your mouth and blow through it while pushing on the needle with your finger.Does it shut of the air that you are blowing through it?
If not.....BINGO.....in the bin and try another.
If all this fails, look into the electrical side.
I have always found that working throught he process of elimination is the easiest way to solve any problem.
You will always find that 99.9% of the time people leap into the high tech side of a problem........then slap themselves silly weeks later when they find out the answer to the problem was a 5 cent,two second lapse of basic thought from the start !!!!!!
Best of luck........Doc Bob.