Fuel lines

[drunkenmaster]

Was browsing through my workshop manual (sadly I do this quite regularly) and I noticed the fuel line diagram shows 3 lines running the length of the car. A send, return and the third goes to a ventilation chamber of some sort above the tank.

Now this is my car:

http://www.angelfire.com/hi3/hiper/260Zdiffremoval_oldtranstunnel.html

and I only have the send and return lines, (the top one pictured being the rear brake line) so I am wondering was this a later model change or am I missing something.

Thanks

[Bambikiller240]

In the USA there was (is) a fuel vapor recovery tank behind the right rear plastic panel (interior of the car) and it connects to a pipe that runs through the trans tunnel to the "Flow Guide" valve in the engine compartment.

[drunkenmaster]

What does this feature do exactly?

Any fellow Australian's know if we are suppose to have this too?

Thanks BambiKiller240, your always right there with my many questions

[sjcurtis]

drunkenmaster,

The system is designed to capture and burn the evapouratung fuel vapour, with a vapour lock in the tank when you open the cap to refill.

I think you will find only the very first HS30 Zeds had this feature, after that it was dropped ( read cost) as our pollution control was not stringent enough to require the system fitted. I dont think it even appears on the latest of the RS30 production Zed for export.

Cheers

Steve :classic:

[Z Kid]

I pulled apart a late 260Z 2+2, and it had the little tank fitted in the interior on the drivers side? Maybe it made a comeback in the later ones here?

[drunkenmaster]

Is it of any real value?

The simpler my EFI plumbing attempt the better :cheeky:

[sjcurtis]

Thanks Z Kid,

Sorry all, a bolt of lightning for me. I do remember also seeing the system in a late 2+2 260z and I think it was causing a weird problem at the time..just cant remember the exact fault.

Cheers

Steve :classic:

[sjcurtis]

drunkenmaster,

I dont think you should have any restriction running injection without that extra line. I run a 6/73 HS30 Zed with injection and no problems.

I will say though if you can get your hands on another primary fuel supply line from a 2 seater fitt it up in place of the original small return line ( 240z problem), or did yours already have two lines the same size from the factory it was one of the changes nissan made for the intro of injection on the S30, I do not know the dates.

Cheers

Steve:classic:

[drunkenmaster]

They look to be of similar size in the photo I posted above, can have a look tomorrow in the flesh.

How did you implement it?

OEM low pressure pump -> surge tank -> High pressure EFI Pump

[sjcurtis]

drunkenmaster,

I am pretty sure your pipes will be identical in size. I was not that lucky, I went OEM 280ZX aspirated format as per mid 82 manufacture even down to the fuel pump & electrics (relays). I had to install the second pipe. I have never been short of fuel at the business end, but I do not put out big HP either ( ask any HONDA driver Ha). For high horsepower application you will have to talk to the guys doing turbo or RB or race.

[MAX]

In reference to Post #2 of this thread, as posted by Bambikiller240 on 7/16/03:

Can I connect the vent line coming from the fuel vapor recovery tank directly to the the air cleaner and remove it from the Flow Guide Valve? And furthermore, can I then remove the Flow Guide Valve completely?

I too have removed all the air pollution stuff and am running dual Webers.

Many thanks

MAX

[260DET]

The third line on my '77 went forward to a charcoal cannister in the engine bay, part of the anti pollution system. IIRC one of the lines from the cannister went into the inlet manifold somewhere. Think the line came from the fuel vapour 'precipitation' tank mounted inside, near the RH rear quarter panel.