Fuel Tank Cap Vent Is Clogged

In this video i show you an easy way to check if your fuel cap is venting properly.

Fuel tank cap vent is clogged.

Find the access to the fuel tank fill and vent fittings on top of the fuel tank. What happens when a tank vent gets clogged on a w123. As fuel is consumed by the engine the level in the fuel tank lowers. To make up for this the fuel cap uses a small vent to allow air to enter the tank.

This stops the flow of fuel to the carburetor causing the engine to stall. Able to enter the tank and a vacuum or vapor lock will occur. A fuel cap that does not vent properly may cause your engine to not run p. The tank vent cap needs to be cleaned occasionally for the carburetor to work properly.

Once you get to these hoses remove the vent hose which is most commonly a 5 8 vent hose. With the hose off blow on the other end and see if air comes out. When this line is. A blocked vent pipe to the car s gas tank can be a real problem.

Is the fuel tank vent clogged at the fuel tank fitting. Most people are not even aware such a problem can occur or what it might lead to. If the fuel cap vent is clogged air won t be. The tank vent cap sits on top of the fuel tank and allows these heated gasses to escape.

Unhook or unscrew the carburetor box cover on top. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. Step 1 switch the stihl chainsaw s master control lever into the stop position and set the saw on a flat workbench. A car s fuel tank is much more than a tank with a fuel hose leading to it.

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. In order to breathe your tank must have a vent somewhere that will relieve both vacuum and pressure. If your motor runs for a few moment and then dies but starts back up this tip may be for you. 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.

If air is free flowing through the hose. Your tank has to breathe.