Vent Box

[suzook86]

OK, did the search thing and found references about eliminating the vent box/tank, but no specifics about this. What is the considered opinion about this? I can understand in keeping a car as stock as possible, but my path is to do logical upgrades to enhance the vehicle. Surely, after 38 years there is a better way to vent the tank than what currently exists.

[Mr Camouflage]

What vent box?

[suzook86]

OK, how about the vapor expansion/recovery tank thingy (tech term ) behind the right aft interior panel. I don't know it just seems there is a better way to do this. Also, how many are still using the Flow Guide which directs said vapors to the crankcase. And if it has been deactivated/removed, wouldn't that add to the problem of vapors in the car. Being that there is no longer a continuous removal of the tank vapors. Just thought I'd throw this out there as this topic is a fairly consistent complaint. Thanks for listening!

[Mr Camouflage]

Yeah thats what I thought you meant, but down under our 240z never had them. That was a 260Z thing, for us at least. Our 240z's dump any extra fuel straight onto the road behind the right rear wheel.

[Arne]

You'll hear pros and cons to both options, with a little searching. There is no one totally correct answer. It all depends on your car, what you plan for it, etc.

In my case, I retained the tank, and replaced all the vent hoses with original Nissan parts. I am still using the flow guide, and it is hooked up as factory. But my car is also very original, so that was part of my reason for retaining it all. For a modified car, I might have removed it.

[Walter Moore]

On my car I replaced the hoses and left the expansion tank intact because it seems to be in good condition.

I really don't see what you would gain by trying to remove all of those hoses except a bunch of potential gas leaks. I strongly recommend replacing them. I guess if your expansion tank is damaged I might have a different opinion.

[Scarab155]

My 1972Z donor had the expansion tank removed when I acquired the car. I could only fill the tank half way until I replaced it. There are 5 lines from the expansion tank that go to the fuel tank (3), return line and filler tube. All these must be capped and then you're looking at a mess. Why replace something that works ? The system that directs vapors to the crankcase cna be spliced to the PCV if you want.

[suzook86]

Thanks for the replys and comments everyone. Mr Camo in Perth, AU. I've an uncle who moved his family there from England some 10 years ago and says it was the best decision he's ever made. I visited when in the Air Force and agree it's a very beautiful place, cheers!