Need help for the connection of Evaporation Tank 's Evaporation hose ..1971 240 z

[suleymantezgul]

I couldn't find this vapor line (Evaporation Line) in my 2/71 240z.Would give a little more info ?.. What I am interested is the location of exit from the vapor line coming out of the expansion tank.Thanks

Edited June 6, 2014 by suleymantezgul

[240260280z]

The line runs from the tank area to the flow device just below ballast resistor in this picture.

72 FSM excerpts below (Emission chapter)

[suleymantezgul]

My 240Z is a 2/71 ..I am trying to put the fuel tank and vapor tank together. There is a evoparation hose for ventilation of the expansion tank,and as seen in schematics of later models that connects to carbon canister all the way to he engine bay.

There is no carbon canister and a third line going the engine bay in my car.

As far as gathered from the information I found,There should be a hard line going through the fender for ventilation.

I need information where this hard line is located and exits through the fender.

Thanks for your help

[tlorber]

Im not sure that the 240's had then carbon canister-neither of my '73s has them. They do have a vent line that runs up to the engine compartment, through a spring loaded check valve, and into the air cleaner. When the vapor pressure builds up high enough, it overcomes then spring and gets sucked I to the engine.

[Jarvo2]

The geniuses at Nissan used different sized hoses for each of the vent tubes. This seems like a pain, but it actually makes connecting the right hose to the right connection much easier! At the bottom of this blog post (Dave's 1972 Datsun 240z: Smelly Situation) you will find several diagrams of what size hoses go where. Good luck!

[jfa.series1]

Here's a picture of the evap tank hookups to the fuel tank. Your evap tank may be metal but the connections should be the same. Look closely at the top left of the evap tank for a small hose - this one connects to the steel fuel vapor line running back from the engine bay. At the bottom left of the evap tank is another small hose that connects to a small pipe on the top of the fuel tank - this is the return line for any fuel that condenses in the evap tank. You will have to have this hose in place on the fuel tank before you raise it back into position. I'll look for or take some pics of the engine bay vent line connections for another post. On the major tank vent hoses I used genuine Nissan parts but others have substituted generic fuel line hoses with great success.

[jfa.series1]

Here is the vapor check valve that should be on your fender under the coil and ballast resistor. The top hose comes from a small pipe in the center of your air filter box. The lower hose comes from a small pipe on the large crankcase breather pipe coming off the engine block. The second pic shows the return hose onto the steel line returning to the rear of the car. The steel line should be visible along the left rail.

I hope all of this helps you solve all your plumbing questions. Good luck with your repairs.

[Mikes Z car]

This is a picture of a 1/1972 car evaporator tank laying on its side. The vent line heads for the gas tank after it exits the bottom of the fender next to the filler hose.

The rubber vent line was pulled off of its connector on the evap tank before this picture was taken.

Edited June 7, 2014 by Mikes Z car
spelling

[suleymantezgul]

Thanks for allyour information and photoes.I am going to the shop and check again for the piping.But Flow Guide Valve is not there (the bolt is still there under the resistor) that I know. Any suggestions what I should do without Flow guide valve ?.At the moment I am not sure either that the steel pipe is still existing.

Also,where this steel pipe starts on the tank side.Does it run with the two fuel lines to the engine bay ?.What is the size of the pipe ?.

Edited June 7, 2014 by suleymantezgul

[Travel'n Man]

This may help with the tank side

[240260280z]

The steel line runs in parallel with the fuel send and return steel lines. It runs from the front of the differential area to the driver wheel well area in the engine compartment.

[Freez74]

I wonder why the tanks in these cars have 3 vents, one should be enough.