No prime new carburetor

[MomsMustang]

I have a lawnmower with a 3.5 HP engine. The area of the carburetor around the primer bulb broke so I got a new carburetor. Cleaned out the fuel tank and added fresh gasoline. The mower primed, started and ran a few times. After that I had to put gas into the carb to get it to prime. That worked a few times. After that it would not prime at all. Gave up and got another carb. Installed it and it would not prime out of the box. Both were made in China carburetors. Carburetor number is 795477. Could I be installing it wrong?

 

[EngineMan]

Check your seals and make sure you have the gaskets the right way round.

 

[MomsMustang]

Thanks for your ideas.

Each time I changed the carburetor I used new gaskets. I put the floppy rubber like one on top of the tank and then put the fiber one on top it. That is correct isn't it? Was careful to make sure the holes line up for the screws so as not to damage the gaskets.

 

[Rivets]

I believe you have installed the diaphragm (floppy rubber) and gasket wrong. The diaphragm should be against the carb and gasket against the tank. Post all engine number so I can double check my instructions.

 

[EngineMan]

I believe you have installed the diaphragm (floppy rubber) and gasket wrong. The diaphragm should be against the carb and gasket against the tank. Post all engine number so I can double check my instructions.

Rubber (diaphragm) goes on the tank side.

 

[EngineMan]

Thanks for your ideas.

Each time I changed the carburetor I used new gaskets. I put the floppy rubber like one on top of the tank and then put the fiber one on top it. That is correct isn't it? Was careful to make sure the holes line up for the screws so as not to damage the gaskets.

Did you clean out the carb....holes, jets, filters etc....

 

[Rivets]

EngineMan you are correct for most carbs, but if he has some Pulsa-Jet or the Choke-A-Matic carbs the diaphragm goes to the carb. That is why I requested the engine numbers.

 

[EngineMan]

Briggs and Stratton Genuine 795477 Carburetor

Is this not the carb he is talking about...!

 

[MomsMustang]

Briggs and Stratton Genuine 795477 Carburetor

Is this not the carb he is talking about...!

Engine number is 9l602-0927-F1

Carburetor is new and tank was cleaned and new gasoline was used.

So is the final decision the rubber diaphragm goes on the tank side?

 

[EngineMan]

Take a look at the two videos to see if it is the same carb, my book and info tells me, and the fact that I have always fit them that way, it should fit on the tank side. you can if you wish try both sides and see...!

https://www.youtube.com/watch?v=PMx0ky8A-Fw&html5=1

https://www.youtube.com/watch?v=_pzWNmFoba0&html5=1