kohler sv725 won't pump fuel

[jim4321]

have a kohler sv725 on my mower it won't pump fuel
i have checked all lines and filter
trying figure out how fuel pump works
the vac hose out of the valve cover has no vacume or presser when turning over engine
any help would be much apprecieated

 

[mechanic mark]

http://www.kohlerengines.com/engines/onlinecatalog/pdf/sm_32_690_01.pdf

See troubleshooting page 18. Take fuel line from pump to carburetor off & see if carburetor is getting fuel. Remember Safety First !

 

[hlw49]

Is the pulse hose in good condition not clogged up or swelled shut?

 

[jim4321]

cleaned all fuel lines ,put fuel pump back on , shot with either it started an runs fine
didn't find anything plugged up guess i have a demen in my motor

 

[bertsmobile1]

have a kohler sv725 on my mower it won't pump fuel
i have checked all lines and filter
trying figure out how fuel pump works
the vac hose out of the valve cover has no vacume or presser when turning over engine
any help would be much apprecieated

The impulse pump is a simple spring loaded diaphragm pump with a check valve on the outlet .
Proper ones have 2 check valves
The impulse signal moves the diaphragm back & forth
They very rarely give any grief
The amount of impulse signal down the tube is quite week at cranking speeds so you will need a bit tissue paper over the end or a damp finger or your tongue to feel it.
No impulse at all = hole in piston, broken con rod , blown head gasket
Take the dip stick out and see if there is an impulse signal coming out of the tube .