Question about Briggs & Stratton Briggs Stratton Intek V - Twin Vertical Ohv Engine with Electric Start 22 Hp, 1" X 3 5/32" Shaft, ModelNo. 44K777 - 0027 - E1
22 hp intek b&s Changed fuel filter, spark plugs(gapped at .040 per owners manual), air filter, etc. Back fires through muffler, at all speeds. Engage blades, same thing. Pull choke 1/2 out, and it runs a lot better, with little to no backfiring. Will not run better with choke out when they are disengaged, only when engine is "loaded" Checked fuel filter and noticed it was empty. Presumed I had a faulty fuel pump. "Borrowed" fuel pump from co-worker. Same results. Fuel filter fills up when sitting and mower off. Start mower, and it runs well for 10-15 seconds, then filter get sucked empty and backfiring starts. Is there a screen/filter in tank that is dirty??? Have been told everything from blown head gasket to bad/misadjusted valves to carb plugged. Still doesn't explain the empty fuel filter which I feel is the main problem. I have changed fuel filters since this started with no help. Have never noticed fuel filter to be empty before, always approx 2/3 to 3/4 full when running, but cannot be sure because I've never really paid that much attention when it ran good. Any help would be appreciated.
Check your rockers inside valve covers. They some time work loose. If they are loose the push rod will fall off rocker and cause the problem.
Posted on May 31, 2009
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Posted on Jan 02, 2017
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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 ! ! !
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