Unlikely that the fuel pump is overwhelming the needle and seat but any cheapo pressure tester from HF ect. will do. Shouldn't be more than 8 psi.
Did you say new carburetor? A few years back I overhauled a carburetor for a friend's shop. His mechanic installed it and found it was flooding. My friend who had talked me up about working on carbs called me over to have a look. His mechanic apparently had had some unflattering things to say about my skills.
Turns out a tiny piece of rubber hose was caught in the needle and seat. Rather than bend a new steel line to replace the old mangled one the installer had cut the steel line where convenient and pushed some rubber hose over the cut(sharp) ends resulting in the stuck needle.
I'm wondering if you may have a similar situation.
Always a possibility, but the fuel system is completely been cleaned or replace from the tank (new) on down and there’s only about 5 inches from the final fuel filter to the carburetor. I will check float
I have been reading accounts (presumably real ) about how imported tractor fuel pumps, fail, or overpressure right out of the box. They are now made in those countries, in factories, but looks like the only PPE they wear is sandals, but that is the world of replacement parts for 50 year old tractors.
I swapped out the 10 year old Chinese pump that was working good because the systems was plugged with rust and the fuel pump was like 25 bucks. As a goof I tore into it just to see what it look like which it was fine but may have damaged it. I was looking at a box of stuff and I found the original fuel pump. I might test and put it back in except it’s a pain in the *** to change.
