NAS 110 fuel tank lines/evap canister Q - Defender Source
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  #1  
Old November 13th, 2012, 02:49 PM
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mark kellgren
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NAS 110 fuel tank lines/evap canister Q

My fuel tank is still the original V8 tank, but Pendy disabled the pump since it's not needed for my TDI and I'm just using the pump line for the pickup. I haven't traced the return line yet and need to, but wanted to see if A) anyone knows how the NAS 110 tank is vented, B) does anybody have a parts diagram of the NAS 110 tank and evap canister (located in the rear right wheel well)? I want to get remove that evap canister since it's not needed for a diesel system, but I don't know where all those lines are going to and from it. I also want to make sure my tank is sealed for wading and safely vented (preferably extended up by the snorkel unless the cap does it).

Any insights and illustrations appreciated.
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  #2  
Old November 13th, 2012, 02:59 PM
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IIRC there are lines to and from the thing under the front fender and another one to and from the steel tank that rusts in the wheel well in the back. I am not sure if they are in series with each other or not. I would think you could plug all but one of the lines and use that one remaining line as a vent or just plug them all and fit the early style filler. The lines all come out of the side of the tank so you should not have to drop it. Sorry no pics, but I have taken a couple apart.
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Old November 13th, 2012, 03:07 PM
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I'll have to go under this weekend if weather holds out and trace the lines to see where they all go. When you say earlier style filler, what do you mean? how does venting occur between early vs late? What's best way to ensure I don't ingest any water in fording in my tank from the venting?
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Old November 13th, 2012, 03:14 PM
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Pretty sure the early style is just vented at the filler.

Not sure how to run an extended vent, but I assume it would be pretty easy.
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Old November 13th, 2012, 06:32 PM
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IIRC there is just a vent or two on the filler side toward the front of the tank. One of the, has the "3-way hose plenum thing" attached to it. Ive got lots of photos but I'm TDY rig now and can't look at them. My tear down pix from my 145 restoration thread might have something.
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  #6  
Old November 13th, 2012, 08:46 PM
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Look at your truck on the Rear Pass side behind the wheel near the filler neck but forward a bit. See how many vent tubes that you have. If it like a newer Defender, 94, then you may have three vents by the main overflow vent at the filler. The fuel return will be on the forward portion of the tank, passenger side, with the out tube being on the top center. The three vents may go to a plastic box inside the fender and then it went to the charcoal canister in the engine bay.
For the diesel you could block off two of the vents and just use the one. The newer Td5 tank has a plastic vent tube with a built in check valve.
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Old November 14th, 2012, 09:03 AM
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This is what I have


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Old November 14th, 2012, 12:19 PM
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Looks like they took the three vents and connected them into one with a one way valve. Should work fine. It is a little low for my liking but if you aren't doing any deep water crossings you should be good to go.
You should have one line running on the top of the frame that was the abandoned vent line and it should still be connected to the Charcoal canister? You can just do away with all that.
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Old November 14th, 2012, 12:43 PM
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Quote:
Originally Posted by Overlander View Post
This is what I have


Attachment 60935
The line in the top right goes to the charcoal canister under the front fender. Seems like you could just take the tank out and the canister out and run the vent whereever you want.
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Old November 14th, 2012, 12:50 PM
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Quote:
Originally Posted by evilfij View Post
The line in the top right goes to the charcoal canister under the front fender. Seems like you could just take the tank out and the canister out and run the vent whereever you want.

Ok thanks. I'm curious where it goes because I have no charcoal canister. I swapped my bulkhead with a European TDI one, and both wings were replaced in rebuild.
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Old November 14th, 2012, 01:02 PM
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IIRC it run along with the fuel line, but I could be off as these things tend to blend together in my mind. The canister was on the passenger side inner fender originally.

If your metal evap tank does not have holes in it, I am willing to bet you could get good money for it.
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Old November 14th, 2012, 01:39 PM
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thanks. John (61rover) has dibs on it since he's been looking for one since at least 2009. He's earned it.
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  #13  
Old November 14th, 2012, 05:49 PM
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What kind of $ are we talking about? I pretty much have the same setup as Mark and will likely be removing it soon.

Mark, if it would help, I can get you a pic of the top of the fuel tank helps. IIRC there are 3 lines coming out of the top of the tank that tie back in.

Quote:
Originally Posted by evilfij View Post
IIRC it run along with the fuel line, but I could be off as these things tend to blend together in my mind. The canister was on the passenger side inner fender originally.

If your metal evap tank does not have holes in it, I am willing to bet you could get good money for it.
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Old November 14th, 2012, 05:57 PM
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I have no idea, but I have one sitting here I have been waiting on the market to set the price on. A bunch of people seemed to be looking for them. I am just going to run a 1995 set up as I think the tank is dumb.
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Old November 14th, 2012, 11:56 PM
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Not that I think this will help too much, but here are the tank connections
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  #16  
Old November 18th, 2012, 02:39 PM
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Here's mine removed today. Perfect rust free example! Had to create a breather inline to replace it. The breather line is on tank and terminates free like diffs with a one we valve. I'll be extending that forward with drivetrain breather lines up at snorkel height.

oops. double posted a pic
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  #17  
Old January 27th, 2013, 04:53 PM
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Thanks to Mark I now have a working catch tank. Here's what mine looked like when I got it out. Two of the for mounts were rusted off.
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