A neighbor brought over a Scotts Brand mower with a 10.5 Briggs that wouldn't start. 2577 0147 01 92021431. I traced the problem to the carb, and found it full of junk. When I removed the needle valve from the inlet tube, It had a light green, foam rubber (I think) ring that stuck on the end of the needle. I could not put the needle valve back into the right position with that foam ring put back into the tube. The needle valve would not go into the tube far enough to allow the float to go into a level position if the bowl were full to spec. It was just stuck like it was wide open begging for gas, but the valve was hard up against this foam ring in the bottom of the tube. I think somebody got there first and put something in there that isn't supposed to be, but if I take this little ring out, the needle valve goes into the tube TOO far (and would let way too much gas into the bowl if left that way. Something has to go into the tube so the Needle can seal the inlet properly, but Im not sure what! I know you guys have seen everything, so I need a clue.

 

It's a rubber seat. It's no good, you need to replace it.

 

I had the neighbor order the new seat, and I installed it, ran perfectly after a few adjustments outside the carb. He managed to pull out the fitting that the inlet fuel hose presses onto on the outside of the carb before I could stop him. and now it leaks. Do you like permatex, black RTV, or something else to seal up this fitting when I take it out and try to put it back for him?

 

Put the fitting on dry, no sealant. It presses in much like the seat did.

 

If that is a plastic fitting most likely you will need to replace it, install as cheese mentioned.
I have not myself found any sealants that are worth trying on fuel lines or fittings since I left aviation anyway. Gas is a different animal when it comes to containing it, it will creep and seap through the tiniest places. Used to find cracks in cylinder heads by plugging them off and filling with gas, gas would creep through the cracks no other fluid would.

 

I'm nott sure what happened here, but I am thinking that after my neighbor got his mower back running, and the fitting was leaking, that he tried to fix it himself. He ordered a new fitting, (the old one was cracked) and could not get the old fitting out so he brought it to me. I cannot get the old fitting out using the instructions that came with it. I think he put some permanent sealer on it. I don't think heat is an option with a pot metal or aluminum carburator, and I need an idea for a safe non destructive process.

thanks in advance!

WML13

 

This is the best way to remove the fitting:

 

THAT was just what I needed! I had already tapped a hole inside the fitting, and inserted a threaded bolt, but was unsure as to just how to pull it out without damaging anything. I added the socket wrench like you did and a nut to tighten against it, and out it popped! (how does it feel to be in the same class as Archemedes?)

Thanks!

WML13

 

Nice post aj-allen!

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