Hi. I have a briggs & stratton 4 hp engine on a wood chipper, it runs but need to leave the choke on full to keep it going. What is the problem Thanks Keith

Have you tried to make any carb adjustments yet? Also the fuel pump could be weak or fuel filter is clogged

Before adjusting carb note location of needle screw and how many turns it take to seat it with your fingers to keep a base line here.

Adjustments for float style carburetors only.

Screw in the adjustment screw until finger tight. Now back it out 1 1/2 turns. This should be sufficient enough for the engine to run properly. This adjustment if for all Briggs float style carburetors and all Tecumseh float style carburetors.

If the engine does not run correctly, let engine warm up for about 5 minutes. Screw the screw in until the engine runs erratic (lean). Then back it out until the engine runs erratic again (rich). Now turn the screw half way between and this should be good enough.

If this doesn't do much or makes it worse then a fuel pump will be in order.