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You may have been right on this, we removed the tank, emptied it and flushed it and blew it out. I replaced the fuel line as well. Never seen and obvious problem but it runs like a top for hours now. Thanks for all the help

I hooked it up with a pony tank and it ran it dry, no issues. I removed the main fuel tank and replaced the line. Honestly couldn't find what the issue was. I haven't had it for a long run since switching back to the main tank. I've also since set the valves but they weren't bad, right side...

Thanks for all the info, I'm going to give the valves a shot.

Yep, covers off, everything I could get to washed up. It's a Briggs and Stratton 407777 type number 0174-E1. Has overhead valves. Do you know the intake exhaust specs? are they set from TDC?

I have a 20hp Briggs on a craftsman LT1000 on that has an issue. Like clockwork it quits after 5-10 minutes of operation. Seems like it's starved for fuel but not sure. Things I have checked and eliminated. - Fuel tank vent - Diodes in coil wires ( still quits after 10 mins with kill wires...