Question about Briggs & Stratton Electrical Supplies

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I have an old 2500 watt 5 hp Briggs powered AC generator. It starts ok but runs rough, it seems to be running very rich. The carb is a non-float type with a diaphragm pump and only one adjustment screw, the screw only varies the roughness slightly. I took it apart, put it back together, no change. Ideas?

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The five hp briggs with diaphragm pump suffered from warpage of the fuel pump cover and /or carb body due to heat from the muffler. Try this first. Remove the diaphragm cover and lightly sand it with fine sandpaper (300 grit). Place the sandpaper on a flat surface (I use a thick piece of glass) and sand in a circular motion for just a couple of turns and check to see of it was in fact warped. If it is in good shape it could be the body of the carb. I am assuming that the valves are seating ok. Good Luck with your repair.

Posted on Mar 10, 2009

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That's interesting that you bypassed the fuel pump after noticing that the carburetor was below the tank, not needing a fuel pump to start the engine.

Maybe they put a fuel pump in to ensure that the float bowl valve is not the only thing preventing gas from overflowing into the carburetor when stored for a long period of time.

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