Outdoor Power Equipment and Small Engines - Lawnmower Help

I have a Scotts Push mower 3 in 1 mulcher, I only use the mulch. (I don't have model # or anything, I bought it refurbished, but the guy said it was about 5 yrs old)

The problem is with fuel I assume...I push the primer a couple times and pull the cord, fires right up runs for a second or two and then dies. I have to repeat this 5 times or so until it stays running. When it does stay running it seems to run sluggish I guess or at lower RPM's than it should or just weak.

I just go anywho and it will constantly try to choke itself off and sputter etc.

What would you suggest?

SHould I start with the vent cap? Trying to do whatever I can to not have to take the tank off etc.

We really need to know the engine manufacturer, engine model, type code usually found on the metal engine shroud just above the spark plug or on a metal tag above the muffler. If it is a Tecumseh you do one thing if it is a Briggs you do something else, however it all has to do with the carb. Have a good one. Geo

Regardless of the engine, it sounds like the carb needs a cleaning.