When the gas inside your Stihl chain saw fuel tank heats up it creates pressure inside the tank.

Most people are not even aware such a problem can occur or what it might lead to. Posts: 4,479. I’m pretty sure the breather is blocked.

Is my fuel tank breather blocked? Does anyone know the layout and position of the breather(s)?
4th September 2015, 12:32 hi, I have been puzzled for the last few months why my hilux 93 2.4l has very rough start have to crank for atleast 10 seconds before starting and very bogged down on hills and that. Then you can decided if the cap is the breather. anyways i noticed when I take my fuel cap off a very loud hissing comes from it which led me to further investigate that my breather may be clogged. I like to be different!

MickL. The vented gas cap is designed to vent small amounts of air into the car gas tank line. - what are the tell tale signs of a blocked fuel tank breather?-Is the fuel tank breather simply the filler cap? The trouble is, it does not allow air to come into the tank to replace fuel as it is drawn to the engine. Let it soak and rinsed. Re: Mk2 2001 - blocked breather? PRI or ON, gas still comes out of the tank and gas goes in. Thanks-pos If you are running a vent line it is important that the line is ran higher than the highest point on the tank including the fuel filler neck.

Most aftermarket tanks come with long hoses.

I took off the fuel cap and cleaned the shit out of it with some carb cleaner. Re: Symptoms of fuel cap vent blockage? Thanks: 213. If the engine runs with the fuel cap removed it will establish a blockage in the vent.Or both vents in some cases. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens by … This is simply a gas cap with a hole in it.

Addicted PP Member. If the tank can't vent this added pressure, fuel will stop flowing from the tank to the carburetor due to an imbalance in the atmospheric pressure and the tank pressure.

Desiccant Fuel Tank Breathers. This is evidenced by a rush of inward moving air when removing the fuel filler cap (the cap has no breather / hole). By mcferreira100, October 16, 2014 in Yamaha Workshop.

Followers 0. For anyone that doesn't think the lift pump on a OM617 can practically suck a golf ball through a garden hose....here are two pictures of my fuel tank when the vent became fully blocked for some reason on a 3,200 mile round trip.

Removal will be difficult and the sudden rush of air into the tank will be audible.

The vent has a check valve in it.


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