Thread: Can't fill up my tank

Replace the evap canister and purge valves you yanked out. It takes up a little space, but doesn't hurt a damn thing performance wise. And your car is a gross polluter without it. Did you need that corner of the engine bay for something, or did you just think it was cool to rip out anything pollution related? It's some of the most basic emissions equipment and some of the first they started putting on cars in the 1960s.
[[ the Other Wayne, that doesn't like hack mods and dirty tailpipes ]]

Let me quote your retardedly vague reply to the op:



I don't see anything in your dumbass reply that gave a solution worth reading, such as "check charcoal canister, vent valve, purge control, etc".

Therefore your response was a lazy man's solution.

Kthxbai.

Ok well that helps me out completely.

The vapor canister and purge valve is there to prevent the gas tank from becoming a bomb. Now letting raw fuel vapors into atmosphere is not a good idea either, flamable you know . The charcoil canister/vapor canister, convert it to water.

Where is that vac hose pic?

ok....whats going on here??? The evap system has nothing to do with the Filler neck for the fuel tank.


If you look at the filler tube assembly you will see the large main tube that the gas flows down, and a smaller vent tube that goes into the top of the gas tank. That smaller tube is a vent tube and attaches to a overflow valve (some systems dont have a valve but just shut off once the gas level blocks the bottom of the tube.) As you fill the tank, the vent tube is also sucking in air (venturi effect), and the gasoline flows freely into the tank. Once the gas reaches a certain level, the float in the overflow valve is pushed up and seals off the vent, this promptly causes vacuum in the system that has nowhere to go, and it sucks in a valve in the gas nozzle which stops gas flow.

Either you have a blockage in the smaller tube, or the valve float is stuck.
I have had some success just blowing 90psi shop air through a blowgun tip into both tubes through the filler neck to fix cars exhibiting this problem...but it doesn't always work. The other option is removing the filler neck completely to check and make sure there are no obstructions, and then after that if no problem is found, you have to drop the tank and go after the valve.

It depends on what year your car is Rob. They 97.5+ have the vapor canisters in the back. If you search other forums, you will see other Nissans having this same issue (the pressure release valve gets stuck (that's on the vapor canister).

Now it could very well be the fill tube too. When I had my problem I drove an hour to pick up a new fill tube and to no avail. Talked to a Nissan tech at the dealership (he's a cool older guy), he said to replace both, and it did do the trick.

Ok I just looked up the component and you are indeed correct that it is labeled as Refueling Evap Vapor Cut Valve, but it is not part of the Canister system. In my previous post I had mentioned . The Vapor cut valve is the fuel level float valve that blocks off the signal tube and pulls the gas nozzle stop valve shut. It is located in the fuel tank. Also labeled as refueling control valve in this picture.

I guess I will have to take a picture of what mine looks like now and where all the lines go. Because after swapping heads I have this issue now with all the extra vac lines and no idea where they should be attached with less connections.

thewizard comes from a school of experience that imposes time limits on the solution of whatever problem there may be, cliffbaby