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Briggs engine,carb on tank. runs on prime only ,replaced diaphragm, carf body had internal corrosion, model 130212 type 1815-01, on log splitter, won't **** gas???

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  • Max G Schoenfeldt Oct 01, 2010

    Briggs motor-130212-carb over tank-no float bowl-has diaphragm to bring fuel up to carb tube- replaced diaphragm and smoothed contact surfaces with fine [600 grit] paper-runs for a few seconds with a prime-had some corrosion on diaphragm contact surfaces???



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I don't know how you installed the daiphram, but I remove the carb with the tank attached, then I take the tank off. with the tank off and the diaphram removed, I dump the tank out and then blow it out with compressed air, then I put in a little gas and afew driveway stones ( as big as will fit ) put the lid on and then holding my fingers over the holes give it a nice long shake. 10 minutes or so. Dump out the gas and the rocks and take a look in there, still don't look like new? do it again till the gas you dump out looks like it's clean. That little pocket in the top of the tank is where the main jet gets it's fuel make sure this is clean too. the diaphram pumps gas into this pocket and then the main picks it's fuel from have the extra just overflows back into the main tank, The main should have a screen around it and you can remove it clean it and put it back on you should be able to blow though to the inside of the carb though the main. once it's all clean make sure the spring that rests on the diaphram is in place and put the tank back on the carb put gas in the tank and shake it up, ( fills the pocket ). put it back on make surethe gasket still seals ( it's OK to rese it just seal in on if it's firred up) it should start right up as long as the plug is clean and it's firing.

Posted on Oct 01, 2010

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Here is a link to a couple of my Tips. And even though they are for weed eaters and such, the same concept applies to your carburetor. The key to carburetor cleaning is the Den Tek Brush!

And depending on how bad your corrosion is, you may end up needing to buy a new carb. Corrosion may keep the parts from moving freely; such as the float.

Good Luck!


Posted on Oct 01, 2010


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Describe your Briggs Stratton Lawnmower Lawn Mower Short Block Problem. I have model# 11A-414E765 Lawn Mower. Starts ok but is surging and when I checked a brand new spark plug it was full of black dust...

I am pretty sure this is a 4.5 Hp engine with the carb on top of the tank. Plastic carb 4 or 5 mounting screws mating carb to tank. Remove the air cleaner... and tighten the carb to fuel tank mating screws. It is drawing air between the tank and the carb. This should stop the surging. If is has been a long period that you used the mower with the surging problem the diaphragm between the tank and the carb may be either out of position or damaged. The diaphragm is not expensive. Usually the first time this symptom presents itself you can resolve it by tightening the carb to tank scresw. IF you have the primer bulb carb..mash the rubber of the bulb against the carb body. If the surging stops... the primber bulb has a pin hole in it.

You passed the mower model number and not the engine model number. When we use the 11A number you passed all we get is the base and handle parts. If you need more help I need the model number off the engine just above the spark plug wire on the air shroud.

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Your Briggs & Stratton has a Sprint or Classic motor on it. Every few years, the diaphragm in the carburetor must be replaced.
Briggs part #495770

1. Remove the air filter assembly. This is a good time to clean and re-oil the filter.
2. Remove the 3/8" head bolt from the front of the fuel tank.
3. Remove the 1/2" head bolt from the side of the fuel tank.
4. Gently pull the fuel tank assembly toward you and tilt it away from you. While doing this, you will need to unhook the governor wire from the throttle plate.
5. Drain the gasoline (you can use it again later)
6. Remove the 5 screws that hold the carburetor on top of the fuel tank.
7. Pull the carb straight up. Be careful not to lose the spring or strainer on the bottom of the carb.
8. Remove the diaphragm.
9. Clean the carb and tank surfaces with carb cleaner spray.
10. Open the package with the new diaphragm in it. You will find 2 pieces. One is rubber, the other is paper.
11. Place the rubber diaphragm onto the fuel tank, then the paper one. Gently reinstall the carb onto the tank.
12. Push the 5 screws back into the carb. Before you tighten any of the screws, have all 5 pushed through and wiggle the carb a little, this will allow the diaphragm to align properly. Tighten the screws.
13. Reinstall the tank/carb assembly. Make sure you hook up the governor linkage.
14. Inspect the governor spring(s). They should be connected on both ends. You should not disconnect them for this repair.
15. Reinstall the air filter, gas, prime, and GO!

Good Luck!

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