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  #1  
Old May 7th, 2013, 11:09 PM
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Mike Barnett
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Fuel Tank question

Trying to figure what this is for. The rubber cap has dry rotted and fallen off, causing the tank to leak when it's full. It doesn't appear to serve any purpose.
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  #2  
Old May 8th, 2013, 06:52 AM
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What motor are you running? It looks like a return line connection. (if it is on the forward section of the tank) Behind that do you have a vent line for the tank?
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Old May 8th, 2013, 08:10 AM
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It's a 200 Tdi. The return line goes in the top, and the tank has a vent line at the filler neck. The previous owner replaced the tank shortly before I got it.
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  #4  
Old May 8th, 2013, 09:20 AM
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Is that a port to transfer fuel from an aux tank?
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  #5  
Old May 8th, 2013, 09:38 AM
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On the diesels I have seen that is the return line connection. Do you have a side mounted pick up with the float or is the pick up on the top of the tank? If you are talking about the overflow on the filler neck that is not a tank vent from what I have seen. I know those tanks are hard to source so maybe the previous owner sourced what was available and you may have extra ports in the tank?
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Old May 8th, 2013, 11:19 AM
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The pick up and return are both on top of the tank, you can see the lines in the top right of the photo. I'll have to dig up photos of the rebuild. I thought the line at the filler neck was a vent (cap is vented)? Not sure it would work as an overflow since it just returns right back to tank and if its full up the filler neck it wouldn't overflow anywhere. I can easily cap the port in question, but I am curious because the previous owner reportedly replaced the tank because it split at the seem due to some sort of pressure issue. I never put much stock in that because her mechanic had sold her on a lot of unecessary parts. Is the fuel tank under any sort of pressure when the engine is running?
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  #7  
Old May 8th, 2013, 12:40 PM
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Is this what yours looks like?

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  #8  
Old May 8th, 2013, 12:56 PM
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No, it doesn't have the side mounted float. It's this tank (Diesel tank photo from RN). Where is the diagram from?
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  #9  
Old May 8th, 2013, 01:21 PM
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Most likely a vent, the cap is probably not vented the "vent line" near the fill spout allows the fuel to go in at a high rate, when you put the cap on it seals up that vent.

There should be hose that connects to the second vent. it and goes upward and has a 1/2 loop in it (facing the ground).
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Old May 8th, 2013, 01:56 PM
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I agree with Thomas. My drawing is from Microcat, http://lrcat.com/#31. Then if you have both the pickup and return line at the top then open connector in your first picture would be for the vent?
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Old May 8th, 2013, 02:12 PM
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Ok, I'm a bone head, the pick up line is in the side of the tank, the return is in the top, just like the diagram. Regardless, it sounds like the port in question needs to remain open instead of being capped. Is the u-shape important or can I just attach a length of fuel hose to it and attach it to the chassis above top of the tank?
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  #12  
Old May 8th, 2013, 03:02 PM
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On diesel fuel tanks, that line is for the fuel tank vent. It goes to the filler neck, on top of where you put the pump.
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  #13  
Old May 8th, 2013, 03:11 PM
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Yes you can vent it like the axles, however I would put a one way valve on it so it you turn over, :-( , you will not leak fuel out.
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Old May 8th, 2013, 03:38 PM
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Quote:
Originally Posted by Capt Milks View Post
Yes you can vent it like the axles, however I would put a one way valve on it so it you turn over, :-( , you will not leak fuel out.
http://www.ebay.com/itm/Fuel-Gas-Tan...088#vi-content

One of these is all you need. Also make sure it is mounted higher than the fill neck (to the cap), if some bozo fills it all the way up you will have a leaky mess on your hands if it is not (we have bozo's filling our tanks in NJ).
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Old May 8th, 2013, 03:54 PM
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Quote:
Originally Posted by Capt Milks View Post
Yes you can vent it like the axles, however I would put a one way valve on it so it you turn over, :-( , you will not leak fuel out.
No, it does not vent to atmosphere. It vents back into the fuel filler neck. No fuel leaks out because the fuel that comes out of the vent goes back into the filler neck.
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Old May 8th, 2013, 05:00 PM
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Quote:
Originally Posted by sonoronos View Post
No, it does not vent to atmosphere. It vents back into the fuel filler neck. No fuel leaks out because the fuel that comes out of the vent goes back into the filler neck.
Ed, the fuel filler vent is seperate from the one I am asking about. The one I'm asking about is towards the front of the tank (red arrow), the filler vent is right above the filler opening.
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  #17  
Old May 8th, 2013, 05:08 PM
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Quote:
Originally Posted by RiftRover View Post

Ed, the fuel filler vent is seperate from the one I am asking about. The one I'm asking about is towards the front of the tank (red arrow), the filler vent is right above the filler opening.
That is for a vent that is "open" at all times. The fill vent only works when filling. Might even be a larger diameter that the other one.
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Old May 8th, 2013, 06:03 PM
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Ah! Sorry about that thanks for the visual aid
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Old May 30th, 2013, 12:10 PM
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Quote:
Originally Posted by tjfslaughter View Post

http://www.ebay.com/itm/Fuel-Gas-Tan...088#vi-content

One of these is all you need. Also make sure it is mounted higher than the fill neck (to the cap), if some bozo fills it all the way up you will have a leaky mess on your hands if it is not (we have bozo's filling our tanks in NJ).
I ran the vent line higher that the tank level but I'm still getting fuel coming out, even though the tank is less that 3/4 full. I wouldn't expect sloshing to go that high. Anyone know where the factory vent line is mounted?
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  #20  
Old May 30th, 2013, 12:16 PM
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Mine is higher than that. It goes all the way to the bottom side of the deck.
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