B&S 6.0hp 128H02-0515-E1 ser.06081657, primer won't work!

[dart451]

Well, trying to get the primer bulb to work on this engine. Changed out to a new air filter box/primer, new carburetor, still won't prime! Even doubled up on the carburetor air cleaner gasket...still not a drop of fuel from the primer bulb! Any suggestions? Engine runs fine when you prime it with Starter fluid!

[KE4AVB]

Just using two gaskets have never worked for me. What I do is to add only the portion needed and bevel it into one complete gasket.

When take the air cleaner base off and remove the gasket look at the impression left by the air filter base. There will be an area of non contact indicated this is the areas that must be built up to seal. Just glue the two gaskets together with wood glue once the second gasket has been cut and beveled as sometime there is nothing to hold the gasket in place if you don't. I use backbone razor blades for this beveling. Basically you are making a wedge gasket with one area doubled up and beveling down to single thickness. Using this method I seldom ever need to install a new air cleaner base; unless, it real bad warped, cracked, or screwed up the previous tech.

The area I see of non contact is usually lower portion of the gasket and to the left.

Note there are three versions of this gasket so make sure you are using the correct one. IPL says PN 272653S.

[dart451]

Thank you for the lengthy discription! Really appreciate it!

[dart451]

Can I assume I can blow a little air into the orifice that is in line with the primer bulb gasket to see if it will prime? Maybe about 100 psi? lol

[KE4AVB]

It actually much easier for me to show how I do it but I not into videos as my ugly mug would just break the camera anyways.

[creia]

It actually much easier for me to show how I do it but I not into videos as my ugly mug would just break the camera anyways.

I have the same situation as you and have been told that "I have a FACE for RADIO"!
Michael

[hanz63]

I will tell you that I'm not overly impressed with the workmanship on some of these new Briggs carbs. I've been down this path before. Had a runner, but no prime. Have a look at that float level and ensure the bowl vent is open.

[KE4AVB]

I will tell you that I'm not overly impressed with the workmanship on some of these new Briggs carbs. I've been down this path before. Had a runner, but no prime. Have a look at that float level and ensure the bowl vent is open.

Just wait until you get the plastic carburetor that Briggs is now using on some models. You definitely got to have a light touch when tightening the screws or use an inch pound wrench.

This particular primer setup is a known problem maker. First even when new the installer can over tighten the mounting screws warping the plastic base. Then over time these bases will warp from heat, natural shrinkage of the plastic, and even the pressure from the air filter seal. These causes results in the cupping of the sealing area. Though not visible easily but it is there nonetheless. It can be easily checked for by installing a new gasket, lightly tightening the mounting screws, and then removing the base to check the impressions left on the gasket.

You find the old gasket is usually still sealing until the base is removed. This is due the paper gasket decompressing and keeping the seal. This leaves techs not familiar with this process scratching their heads as "It worked before I remove the base, why won't it work now." thoughts.

I have tried over tightening the screws to only severely damage the new gasket in one area and no damage in others. This is where it dawn on me to use a wedge gasket setup. Since I now get this gasket in AM it is cheap enough to use two when making the custom gasket.

[dart451]

Just wanted to let you all know what I discovered with the NEW primer bulb base that I put on and couldn't get to work! There was no hole drilled at the end of the primer tube assembly! Manufacture flaw! That's why the NEW base wouldn't work! So, I used an ice pick, made a hole, put it together and walla! It now primes! Thanks to all that helped!

[KE4AVB]

Tnx for the update...

That definitely would do it and with the other foul ups I seen this year out several other manufactures it is not unsurprising. It sounds someone on the assembly line carted the wrong pre-assembly parts for the robots to assemble.