easy way is to drill a 1/16 hole in the middle of your gas cap
Diesel coming out of the tank breather pipe on a 1997 non-turbo diesel van may indicate a few issues. It could be due to overfilling the fuel tank, causing the excess fuel to escape through the breather. Alternatively, a blocked or malfunctioning tank vent can create pressure that forces fuel out. Lastly, a faulty fuel cap or damaged breather hose might also contribute to this problem.
The 'vent valve' is a breather... it has no moving parts... they're typically placed at the top of the fuel tank.
inside the fuel tank
Remove fuel tank, replace pump from top of tank, re-install. Change the fuel filter while your at it!
in most(all)vheicles gas tank breather runs side to side with fuel tank hose(where you put the gas nozzle when filling up ) look for a small hole under the area where the gas nuzzle goes usually that is the (gas thank breather)
Fuel Injected? Located in the fuel tank - usually have to remove tank for access
you will need to drop the fuel tank and remove and install from the top of the fuel tank
Remove fuel tank--access at top of tank Remove fuel tank--access at top of tank
it's a breather hole to let air in as fuel is used. without the hole the engine would stall or the fuel tank would collapse like a crushed beer can.
You must remove the fuel tank.
remove fuel tank.
Drop the fuel tank.