Fuel Tank Cap Vent Is Clogged

What happens when a tank vent gets clogged on a w123.

Fuel tank cap vent is clogged.

As fuel is consumed by the engine the level in the fuel tank lowers. 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. 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. If air is free flowing through the hose.

To make up for this the fuel cap uses a small vent to allow air to enter the tank. With the hose off blow on the other end and see if air comes out. 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. In this video i show you an easy way to check if your fuel cap is venting properly.

Once you get to these hoses remove the vent hose which is most commonly a 5 8 vent hose. A blocked vent pipe to the car s gas tank can be a real problem. When this line is. In order to breathe your tank must have a vent somewhere that will relieve both vacuum and pressure.

Able to enter the tank and a vacuum or vapor lock will occur. Step 1 switch the stihl chainsaw s master control lever into the stop position and set the saw on a flat workbench. Find the access to the fuel tank fill and vent fittings on top of the fuel tank. The tank vent cap sits on top of the fuel tank and allows these heated gasses to escape.

A fuel cap that does not vent properly may cause your engine to not run p. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. Your tank has to breathe. This stops the flow of fuel to the carburetor causing the engine to stall.

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. If your motor runs for a few moment and then dies but starts back up this tip may be for you. The fuel level of your tank changes throughout the day even if you are not driving it.

Modern vehicles have a vent hose that is part of the fuel system. Unhook or unscrew the carburetor box cover on top.