No fuel flow to Briggs & Stratton Intek, 18.5 hp

How long does it run before it quits?

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You could try sending your question to the Customer service on the Briggs & Stratton Website. Maybe they will be able to explain and suggest a good solution.

So have you actually checked spark to both plugs? If so then inspect valves to be sure valves are operating. Sounds like running on one cylinder. A quick check would be to unplug one spark plug at a time. You may find if you remove the dead plugh wire, there is no change. If you unplug the running cylinder it probably won't start. Sometimes the compression release mechanisms can come apart or come loose. Download your manual for you engine model at www.briggsandstratton.com

Check the choke, if that doesn't work the old gas may have left residue that is plugging your ports.

There is a restriction somwhere before the fuel filter, this is assuming gravity feed and there is no fuel pump for the engine.

Had the same problem with an almost new Craftsman w/ Intek 20.0 HP. Check all the "usual suspects" and had to have a tech come out. He had me start it. It ran for a few minutes and stopped (per usual). He immediately went to the Anti-Backfire solenoid. It is an electrically operated "plunger-style" fuel line blocker. They are famous for going bad. The part is about $65 and its sole purpose is to starve the engine of its fuel supply at shutdown so it won't backfire. If it is disabled, the user must throttle the engine down for 10 seconds or so before turning the key off in order to avoid backfires. Gee... let's see, 10 seconds of my time each time I use the mower vs $65 part ... No contest! Remove the solenoid, take a pair of electrician side cutters and snip off the tip of the plunger and reinstall it. Problem solved ! ! !

sounds like you sucked up dirt in the carb needs to be taken off and cleaned

Believe it or not, I had this same thing happening on our L120 John Deere. Turned out to be a plugged gas cap vent! At first I couldn't believe it but i resolved it with my air compressor. Now I always make sure the vent is clean and have had no problems since.

I put a new carburator kit in a Briggs & Stratton 18 HP Twin. But did not replaced the needle nor the new seat that came with kit, because I did not know how to remove it and did not to damage it. now the gas over flows

an easy way to know that is to start engine and give it a shot of starting fluid ,if you can keep it running by this method I would replace diaphragm.