If you unit has a Fuel filter on it, I would try changing it. If not your fuel line might need to be replace.
It may be one of two things. Either it isn't getting enough gas, or to much
Clean out the carburetor with gas, the reason it wont keep running is its not getting enough gas through the carburetor.
No you do not put oil in the gas - 4 hp Briggs & Stratton motors are 4 stroke, not 2 stroke in which you do have to add oil to the gas.
not getting gas.... needs carb cleaned
Type your answer here... It backfires because it is a Briggs and Stratton - replace it with a Honda or Kholer.
Try http://www.briggsandstratton.com.
I have a 14.5 Briggs and Stratton engine on a Ranch King riding mower that will not start. After spraying starter fluid into the head, and air cleaner it fires for a second, but will not run. It is getting gas.....coil??? or something else?
Yes
For a Briggs and Stratton motor 3.5 motor used straight gas and oil in the crank-case, there is no ratio.
There is no "gas oil ratio", the 3.5 hp Briggs and Stratton engine is a four-stroke design, oil should NOT be put into the fuel!!!
A Briggs and Stratton L head twin engine wills pit gas out of the carburetor and flood out when starting if the diaphragm has been damaged. This will cause excessive fuel to enter the carburetor.
The way to drain gasoline from a Briggs and Stratton lawn mower is to take the oil cap off and drain the oil. From there, run a rubber hose into the drain and siphon the rest of the oil and gas out.