Fuel Tank Cap Vent Is Clogged

If air is free flowing through the hose.

Fuel tank cap vent is clogged.

A fuel cap that does not vent properly may cause your engine to not run p. Most people are not even aware such a problem can occur or what it might lead to. Unhook or unscrew the carburetor box cover on top. If the fuel cap vent is clogged air won t be.

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. Find the access to the fuel tank fill and vent fittings on top of the fuel tank. The tank vent cap needs to be cleaned occasionally for the carburetor to work properly.

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. A car s fuel tank is much more than a tank with a fuel hose leading to it. What happens when a tank vent gets clogged on a w123. A blocked vent pipe to the car s gas tank can be a real problem.

Modern vehicles have a vent hose that is part of the fuel system. 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. This stops the flow of fuel to the carburetor causing the engine to stall. Once you get to these hoses remove the vent hose which is most commonly a 5 8 vent hose.

The fuel level of your tank changes throughout the day even if you are not driving it. Your tank has to breathe. In this video i show you an easy way to check if your fuel cap is venting properly. When this line is.

Able to enter the tank and a vacuum or vapor lock will occur. To make up for this the fuel cap uses a small vent to allow air to enter the tank. 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.

As fuel is consumed by the engine the level in the fuel tank lowers. With the hose off blow on the other end and see if air comes out.