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Mower runs/quits after priming

kdwiley's Avatar

Join Date: May 2008
Posts: 6

05-01-08, 11:20 PM   #1  
Mower runs/quits after priming

I have 3.5 hp Murry push mower. Has been a jewel all these years. Never failed me before. But I notice that the primer rubber pushed in and did not recover its shape as usual. Started with a clean tank, etc. and got it to run. Cut grass for 15 minutes or more and it stalled. Could not get it to run again. Tore off carb and gas tank and cleaned. It would then only start long enough to run out the gas that I was priming directly into the carb. Tore it off again and found a little more gunk to clean, but same result. One more time I tore it off and did not find anything that seemed remotely plugged. Pulled spark plug and cleaned. Same result, prime/fire/run/die. Any suggestions. There is no bowel on the type unit. The carb screws directly to the tank and all filters, valves, etc were cleaned.

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cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,571

05-02-08, 01:15 AM   #2  
I'd suggest replacing the carb diaphragm and you may need to replace the primer bulb itself if it is getting soft or hardening.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

geogrubb's Avatar

Join Date: Jun 2006
Posts: 2,333

05-02-08, 02:14 PM   #3  
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.

Here we go;
Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble) with a small screwdriver pry out the main jet(carefully) and clean it, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem. Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo

ningbo247's Avatar

Join Date: May 2008
Posts: 1

05-02-08, 02:26 PM   #4  
i am having the same problem with my craftsman mower (tecumseh engine). i have taken apart and cleaned the carb but get the same result, runs for 10 minutes then quits. I have replaced the primer bulb and the "o" ring on the float bowl.
any other suggestions?

jsouth's Avatar

Join Date: Jul 2005
Posts: 205

05-02-08, 03:17 PM   #5  
Try loosing the gas cap on the tecumseh mower,see if that helps,may not be venting.


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