B&S 4HP - Starts but quits fast

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  #1  
Old 07-23-10, 04:53 PM
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Arrow B&S 4HP - Starts but quits fast

I have a Briggs and Stratton 4 hp Model 10T501 Type 0457E1 Code 06060754. It us 3 years old and has been taken care of well. Problem is it will crank after pressing the priming bulb 3 times but will stop after about 2 seconds of running. I have done the following but I cannot get it to run upon starting.

New Spark Plug
Fresh Gas
Cleaned the carburerator, removed the jet cleaned it, cleaned the intake sleeve (silver looking mesh), and sprayed the intake line on the carberator with carb cleaner.
Put a new diaphram on the carb.
I need your help what can it be else to try. THANKS
 
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Old 07-23-10, 05:21 PM
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For some reason the briggs site doesn't like that model and type number, maybe its to new, anyway I will guess as the below fixes most of the later briggs with the plastic carb on the tank.

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.

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. Check the intake tube to see if the O ring seal and plastic retainer are still on the intake tube, if so remove them and re-install them into the carb. 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), now with a small screwdriver pry out the main jet(carefully) and clean it, check the O ring on the main jet for damage, if it is damaged it must be replaced, 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(not necessary if the fuel tank was clean). 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
 
  #3  
Old 07-23-10, 07:13 PM
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Geogrubb,

I have tried this already today with a new diaphram. The model is 10T502 Model Series 90000 Sprint/Quattro. I will repeat this again and look at the jet for that O-Ring. You were a big help once before on another mower I had.

I will use some carb spray cleaner but I will look again. I will repeat this and provide a update. Any other ideas if this does not work??? THANK YOU
 
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Old 07-23-10, 07:43 PM
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I have a link on here somewhere that shows this stuff, anyway, sometimes the little hole in the jet/nozzle did not completely clear when it was made and will slowly close off the hole, so check it closely. It is the tiny hole near the top. Have a good one. Geo

 
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Old 07-27-10, 06:07 PM
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Geogrubb

The O- Ring was in place but I did put a paper clip through those real small openings in the jet all is clear and reassembled. Put it back together and it did crank and I used it BUT this I think is important to share. I had to press the priming bulb about 8-9 times. I noticed that when I pressed it the first 5 it was not doing the small squirt of gas into the body of the carburerator. Therefore it took many times to prime it. So I ran it and cut the yard. I went back out the next day and it took aout 6 presses to prime it to start. I now have waited 3 days and again it took the 6-8 presses to get it to start. The first 4 presses do not squirt any gas.

What would be the cause of the priming bulb taking that many tries to prime up?
 
  #6  
Old 07-27-10, 09:50 PM
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primer circut may be leaking air or there may be a restriction in the passages.
 
  #7  
Old 07-27-10, 10:38 PM
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The check valves in the primer circuit sometimes get buildup on them or just swell, dry out, stiffen, and/or other things that makes them less than new, or could be as tyrantfour suggests.
 
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