Air intake

[Warren5858]

I have a Briggs and stratton 17.5. It will start and run as long as I put the palm of my hand over the intake where the air filter goes. As soon as I move my hand away it dies. Can anyone explain this please

 

[Scrubcadet10]

The engine is running lean, (too much air or not enough fuel) your palm is acting as the choke, lessening the amount of air able to enter the fuel air combustible mix.
remove and clean the carburetor, or if you want to chance a cheap amazon replacement carb, that is your choice to make.
also be sure you have good fuel flow to the carburetor from the tank.
if you can post the model and type numbers of the engine that would be great, so we can know what we're working with. if its a single cylinder usually stamped into the top or side of the valve cover.

 

[bertsmobile1]

Not enough fuel getting past the main jet
Dirty carb
Dirty solenoid
Low fuel level in float bowl
Insufficient fuel supply
Air leak between the carb & engine

 

[Warren5858]

The engine is running lean, (too much air or not enough fuel) your palm is acting as the choke, lessening the amount of air able to enter the fuel air combustible mix.
remove and clean the carburetor, or if you want to chance a cheap amazon replacement carb, that is your choice to make.
also be sure you have good fuel flow to the carburetor from the tank.
if you can post the model and type numbers of the engine that would be great, so we can know what we're working with. if its a single cylinder usually stamped into the top or side of the valve cover.

2018 Briggs and stratton 31R9070062G1