Fuel Tank Cap Vent Is Clogged

Step 1 switch the stihl chainsaw s master control lever into the stop position and set the saw on a flat workbench.

Fuel tank cap vent is clogged. The tank vent cap needs to be cleaned occasionally for the carburetor to work properly. Most people are not even aware such a problem can occur or what it might lead to. With the hose off blow on the other end and see if air comes out. Unhook or unscrew the carburetor box cover on top.

If air is free flowing through the hose. Modern vehicles have a vent hose that is part of the fuel system. If the fuel cap vent is clogged air won t be. A fuel cap that does not vent properly may cause your engine to not run p.

What happens when a tank vent gets clogged on a w123. A car s fuel tank is much more than a tank with a fuel hose leading to it. When this line is. Able to enter the tank and a vacuum or vapor lock will occur.

Once you get to these hoses remove the vent hose which is most commonly a 5 8 vent hose. To make up for this the fuel cap uses a small vent to allow air to enter the tank. In order to breathe your tank must have a vent somewhere that will relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down.

The tank vent cap sits on top of the fuel tank and allows these heated gasses to escape. 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. Is the fuel tank vent clogged at the fuel tank fitting. The fuel level of your tank changes throughout the day even if you are not driving it.

If your motor runs for a few moment and then dies but starts back up this tip may be for you. Your tank has to breathe. Not only can this boat fuel tank vent cause issues when filling up but it can also starve the engine of fuel and leave you stranded. The vent hose had been shoved down creating a sag or belly and causing fuel to become trapped in the line which blocked the tank s ability to vent.

In this video i show you an easy way to check if your fuel cap is venting properly. This stops the flow of fuel to the carburetor causing the engine to stall.