Coastieee240z said:

I could be wrong but somethin's tellin me that it's not just for that...things expand when they get hot and on hot days that gas sitting in that metal tank is going to do the same thing which means the vapors need somewhere to go and if your gas cap is functioning properly well it ain't goin out that way So I think it allows circulation so to speak and possible controlled venting ?? If someone knows for sure please correct me if I'm wrong :nervous:

What happens in new cars then? They don't have evaporation tanks and elaborate complicated hoses.

Is it built into (inside) new tanks? My understanding was it vented the pressure when filling up to prevent the gas nozzle from tripping prematurely. If that's all it does, there must be a simpler way.

It was meant to allow for expansion of the fuel load (due to tempurature changes), and to retain the gasoline fumes inside the fuel system. The fumes were then routed forward in the car to the Flow Guide Valve. (left inner fender below the coil) The Flow Guide valve would either send the fumes to the crankcase (if the engine isn't running) or to the intake system to be burned (if the engine is running)

One thing to keep in mind...............if you remove the tank and don't do it right, you won't be able to fully fill the gas tank (due to the shape of the tank, an air pocket will develop at the top of the tank)

As far as I know, newer cars DO in fact have evaporative canisters. I believe that some gas stations have signs advising you NOT to "top" off your tank due to damage to both the gas stations system for re-circulation of fumes, but also your car's.

But as far as having a bubble that would prevent you from filling your tank, that would only occur if your car were parked sideways on a pretty steep incline with the passenger side on the low side. At that point the only pocket that would be generated would be in the "thinner" section of the tank, since that part would be uphill, and when the level of gas reached the bend in the "L" of the gas-tank (as seen in silhouette from back side to front side). At that point you would fill up and not really have filled up.

However, even if the car were level, without ANY vent hoses, Carl is right in that the exit of air from the tank would be going up stream through the filler tube. Now what would occur is that the gas tank would "burp" and possibly spray gas over the side or on you.

There are methods of removing and caping the vent tubes, check with Beandip as he removed his.

Enrique

I believe that once the gasoline level was higher than the upper edge of the filler nipple (on the tank) that air remaining in the "tall" (RH) side of the tank would be trapped and thus cause fuel to burp out of the filler and prevent filling.

Anyway, as Enrique alludes; Beandip has the info on the correct way to eliminate the evap tank and any possible problems. I believe that he's already posted it on this website several times. You might check in the Tech Articles forum, or try a SEARCH.

Coastieee240z you made my day with that mark about the clamps. Im on the same level with you.