Small Engines (Lawn Mowers, etc.): 18 hp briggs horizontal model 422447type405901 code 9211185b, hp briggs, hose clamps

Question
Motor wouldn't start.Changed coil and plugs ran OK for a day.
Wouldn't start rebuilt fuel pump (3 bolts hold it to the carburator)changed plugs-ran OK  for a day.Next day wouldn't start Rebuilt carburator and changed plugs ran OK
for a day.Today it wouldn't start.Compression is 115 both
sides.I am at my wit's end Any advise ?
Thanks,Dan
start rebuilt carburator

Answer
Hello Dan:

Have you Changed the Hose Clamps on the Fuel Pump Vaccum Hose from the Spring Type to the Screw Type? If No, then you May be Losing the Vaccum for the Fuel Pump. If the Fuel Pump Loses Vaccum, then the Gas Leaks Back to the Tank and Will Not Pull Gas Back to the Carburetor. If you Pour a Small Amount of Gas (1oz) Into the Carburetor Throat, Does the Engine Start? I Usually Install a Low Pressure (2 to 4 psi or 4 to 7 psi) Electric Pulse Pump and Let the Pulse Pump Supply the Gas to the Carburetor Pump. Usually this Prevents this Problem from Occurring Again. I have had Many Sears, MTD, Poulan, JD, Bunton and Other OEM Mowers Riders that had the Same Problem and it Turned Out the Vaccum Hose Clamps were Allowing a Vaccum Leak and the Pump was Not Operating Properly. I Replaced the Hose Clamps and the Engine Fire Up with No Problems. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model (5 or 6 Digits) and Type Numbers (first 4 digits Only). Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. Have a Happy Holiday Season and May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John