Gas Tank Vent Hoses How Specific Do They Have To Be

[deadflo]

I need to finally replace my old vent hoses on my 71. I am seeing pieces of what I believe to be aged rubber showing up in my clear fuel filters. I saw one of the old hoses back by my tail light, and it specifically said "Not for fuel use " on it! Duh. Do I need to purchase the kit of specific hoses for the 240Z, or can I just locate fuel approved hoses that are long enough to be able to fit. I have found one kit with all hoses online for 225 dollars. Seems a but steep for rubber fuel line. i seem to recall one of the hoses takes a few turns and the OEM part is most desirable, but can other cheaper hoses work? What diameter are these hoses anyway?

[SteveJ]

Most of the hoses are NLA. This may help: http://www.classiczcars.com/topic/43723-fyi-fuel-tank-vent-hose-info/

[rossiz]

i've seen a few posts where folks have stuffed a piece of spring inside the hose that does the sharp bends to keep it from collapsing/pinching from the bend. you can usually find a good selection of springs at the hardware store. others will have more complete info on hose size, but i can't see why regular fuel line wouldn't be fine for the vents.

 

i think the $$$$ kits are really about having concours-correct, cloth braided, OEM stuff in there, which is sure to make your z run better, boost power by 10% and score points with all the ladies... 

[SteveJ]

Springs for bending hoses: https://www.google.com/search?q=goodyear+hose+bender&ie=utf-8&oe=utf-8#q=goodyear+ez+coil

Now if you want OEM hoses, you can search http://www.carpartsmanual.com for the part numbers and check with a dealership if they are available. Courtesy Nissan has a feature to search to see if a part number is still available: http://www.courtesyparts.com.

[siteunseen]

I bought all fuel hose rated diameters at O'Reillys. Quarter inch to five eights. Cost $68 including the clamps.

[Travel'n Man]

This may help as well - http://www.classiczcars.com/topic/49031-whats-that-smell-exhaust-fumes/

[bartsscooterservice]

I used aftermarket oil/fuel resistant hose, but it was tough getting it in. Looks like this

 

http://img.diytrade.com/cdimg/2021928/31679391/0/1359009251/Fuel_hose_oil_hose.jpg

 

If you want more OEM look, you can go for nylon braided oil/fuel line, like this

 

http://autofittings-uk.com/shop/en/nylon-braided-hose/143-an-6-an6-nylon-braided-oil-fuel-line-stealth-black-hose-6-meter-autobahn88-hs026-a06.html

Edited April 7, 2015 by bartsscooterservice

[Kurbycar32]

Somebody tell me how I screwed this up, but the car ran perfectly (until I pulled the motor) and I had no fuel smell.  Using this diagram graciously made by Travel'n Man: 

 

• removed the vapor tank completely
• discarded green hose, capped vent on tank
• discarded blue hose, capped vent on tank
• discarded yellow hose
• connected orange vent on tank to yellow vent on fuel filler

By "discarded" i mean "allowed to disintegrate after touching".  I kept the vapor tank just in case but i cant say I've missed it.  This is how the fuel venting works on dirt bikes and the few classic vehicles I have worked on that existed before emissions regulation existed.

 

 

[Freez74]

Somebody tell me how I screwed this up, but the car ran perfectly (until I pulled the motor) and I had no fuel smell.  Using this diagram graciously made by Travel'n Man: 

 

• removed the vapor tank completely
• discarded green hose, capped vent on tank
• discarded blue hose, capped vent on tank
• discarded yellow hose
• connected orange vent on tank to yellow vent on fuel filler

By "discarded" i mean "allowed to disintegrate after touching".  I kept the vapor tank just in case but i cant say I've missed it.  This is how the fuel venting works on dirt bikes and the few classic vehicles I have worked on that existed before emissions regulation existed.

How is your tank vented if you capped the vents?  I am trying to do the same.

[siteunseen]

This guy's vents through the filler neck it looks like, http://www.classiczcars.com/topic/17542-treating-insideoutside-of-gas-tank-with-por15-products-and-removing-evaporation-tank/

 

EDIT:  It's the same as KurbyCar after I looked.  

Edited April 8, 2015 by siteunseen

[SteveJ]

That's the problem. His tank probably isn't vented now.

[siteunseen]

Doesn't the gas cap vent?

 

240s do.

 

Edited April 8, 2015 by siteunseen