Briggs and Stratton Troubles

You mentioned installing a new fuel line. ....I assume you used a flexible line.

If the fuel hose is too long, there may be a "dip" or "arch" in the shape of the hose.

This can cause a momentary "trap", and can cause the engine to cut out.

The fuel hose should be a straight run between the tank and carb inlet.

if you can find a known good carb that fits that updraft manifold I would try that, would isolate problem to either carb or engine

aluminum Briggs are known for loose valve seats

you have tried 2 different floats, is float maybe bent a bit and hanging up??, try tapping carb with wrench when it starts to die, DO NOT use 10 lb sledge!!

I have been stumped on a few, once I ran heavy dose of SeaFoam and problem somehow fixed itself

please keep us posted

When it dies out, does it re-start IMMEDIATELY, or does it have to sit awhile before it will restart? .....If it restarts immediately, this usually rules out ignition problems, and may be caused by the float sticking closed, water in the fuel, a restricted gas cap vent, or a lean fuel mixture.

When it cuts out, you need to IMMEDIATELY check for the presence of a strong spark to the plug. ....Pull the lead off the sparkplug, and the spark should jump a gap (to a good ground) of at least 1/8" with a sharp blue spark. ....If there is no spark present, your problem lies in the ignition system.

You can also hold the sparkplug lead away from the terminal of the sparkplug while the engine is running. .....Again, a strong blue spark should be able to jump a distance of at least 1/8" (1/4" is better). ....If the spark falters, or is a pale yellow spark, your ignition is not up to par.

A faulty ignition coil usually fails after running approx 15-20 minutes, and will not restart until the coil has had a chance to cool down.

A bad condenser, oil-soaked points, or a primary wire grounding, can also cause your problem.

Intake valve hanging from old gas varnish. Valve will stick long enough to loose compression then release. Had a wisconson engine do the same. When you got it running w/o the air filter give it a few squirts of penetrating oil in the air intake.

As per one post below, spray gas or ether in the carb when it starts to die. If it will run with the spray, you have a fuel problem yet.

Roger in Iowa

if it dies you have spark issue, dying after 10 minutes might be bad coil or maybe a consensor

I'm sure you have tried another plug

not an expert but I sure like to take em apart and sometimes even get them running afterwards

If it has a main jet similar to this carburetor it probably needs to be cleaned. Could have that gummy residue from old gas gas sitting there. Check the flow from the tank to the carburetor. You may need to readjust this screw CCW to enrich the fuel mixture until it runs smooth. Hal