I am having problems keeping my 51 3100 running after starting. It sputters and dies and seems to be flooded. I have researched the forums and have come up with two likely candidates to my problem. By the way, I am running a 1958-69 235 with a Carter YF carb.

Float is stuck or not working

needle valve is gunked up.

I am running fresh gas by bypassing the tank and with clean lines. The truck sat for 10 years.

Question is, how do I go about checking the float and needle valve? I have tried tapping on the outside to free up anything stuck but have had no luck.