AboutFred Hemmer Expertise Lawn-Boy and Toro commercial and consumer equipment questions. Including: 2 cycle and 4 cycle engines,(gas or diesel), electrical troubleshooting, drive train questions (gear and hydro), quality of cut and chassis questions.
Experience 18 years with Toro and Lawn-Boy. Developed and conducted in-field training on engine, electrical and hydraulic components. Authored manuals concerning lawn and garden equipment. Worked with customers on the phone to resolve issues.
Organizations Engine and Equipment Training Council
Publications Toro and Lawn-Boy web sites
Education/Credentials BS in Business Admin
Kolher, Kubota, Kawasaki, Tecumseh, Briggs and Stratton factory engine training
Hydro-Gear training
Various in-house training certificates
Expert: Fred Hemmer Date: 7/22/2008 Subject: B&S 5HP fires and dies.
Question My 5hp B&S (murray is the name brand) I don't have the serial number, mower was returned to me and it will only run if you constantly prime it,will intermittently run for a short period of time without constantly priming, I've tried running it without air filter, without muffler, i changed the spark plug and drained all the gas and added fresh fuel.i can barely keep it running if im constantly pressing the primer "bulb" i was told it ran out of fuel and would not restart(inlaws borrowed it) lol
Answer By pushing the prime constantly to keep the engine running you have become a fuel pump.
Check the air vent in the fuel cap. Check the fuel line, is fuel flowing freely?
For some reason fuel is not going up the nozzle and into the Venturi of the carb.
If it isn't any of above remove carb disassemble clean and inspect the parts. If they look worn or damaged replace them. Be sure to install new gaskets and air air filter. This should fix the problem
