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B&S 19.5hp on John Deere no fuel pumping

3K views 1 reply 2 participants last post by  AVB 
#1 ·
Hi - have a B&S 19.5hp on a John Deere LA110 ride on mower which won't start. Engines winds on started but doesn't fire. Have checked spark plug and getting spark through. Have checked fuel lines and pulse line and no blockages. Checked pump and not pumping fuel. Have replaced pump and still no fuel being pumped. Hoping someone can help.
 
#2 ·
First double check fuel line connections. They can be easily connected wrong. From there you need to check for anything that can prevent crankcase vacuum such as a bad crankcase gasket. You can not the valve cover off or dip stick out either as this prevent vacuum being created to operate the fuel fuel pump.

There is a reed valve in the crankcase vent that could be not closing. Also these engines are bad about blowing head gaskets between the cylinder and the push rod galley. If blown bad enough it could prevent vacuum from being high enough to operate the fuel pump.
 
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