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workin' on the fuel tank
#87481 November 14th 2005 4:37 pm
Joined: Jun 2004
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vantooner
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Well, today i dropped my go-juice tank, and removed my sending unit to find out why my go-juice gauge stopped working. (turns out the float is full of gas, so i need a new one.) My questoin however is this: when i was removing my unit (that's funny [Big Grin] ) i noticed there are 2 rubber lines going from it, one being the line that delivers fuel to the carb, the other didn't seem to be attached to anything. Should it be? See pic...  - (it's the longer of the 2 lines. The one that clearly didn't have a clamp on it) Is it a vent line? Cuz it seems like there are a lot of them if this is the case. (one by the fill tube, one out the top of the tank and this line?) I couldn't find it in my manual, as that only showed the 36 gallon tank. (mines a 22.5. Sending unit is on the passenger side)

Re: workin' on the fuel tank
#87483 November 14th 2005 9:11 pm
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No i don't. This tank came out of my 81 Dodge, so it may have been hooked to it in that van. Can I just plug it? (I don't have a char. can)_

Re: workin' on the fuel tank
#87485 November 15th 2005 12:02 am
Joined: Nov 2001
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pooh-bah
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Cap it.

Re: workin' on the fuel tank
#87486 November 15th 2005 9:13 am
Joined: Oct 2001
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Madman!
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You should be able to buy just the float. If so, replace it only. If you need to change the whole unit, test it first. On my 78 Ramcharger, they put a new sending unit in. It has the same replacement part number, but the inner workings are different. I need to send it and the guage out to get it recalibrated. It would have been much easier to do when the tank was out.

Re: workin' on the fuel tank
#87487 November 15th 2005 11:48 am
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I think a new float is definitely in order. I don't believe a whole sending unit is necessary, cuz it always worked fine until this summer, and even then it worked intermitently but only up till 1/2 tank. That mystery line definitely only allows movement in one direction...in. It goes to an amber colored tube inside with a valve in the end of it, so my guess is it was hooked to a canister, so i belive it will be capped. If it causes a problem, its easy enough to get to to uncap it. Thanks everyone. [Big Grin]

Re: workin' on the fuel tank
#87488 November 15th 2005 12:02 pm
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Just ordered a new float. [Big Grin]

Re: workin' on the fuel tank
#87489 November 19th 2005 5:23 pm
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Well, my float came yesterday, and it was every bit what i expected. I am very happy with the service and sale i had with [url=http://www.gastanks.com]www.gastanks.com[/url] . I highly recomend this company. Today reassembled my gas tank while freezing my ass off. I got it all put back together save one strap. (i had issues with the j bolt) Therfore I don't want to fill it with gas yet to make sure the gauge works correctly. I also rewired the ground cuz that looked a little suspicious to me as it fell apart in my hands. [Smile]

Re: workin' on the fuel tank
#87490 December 30th 2005 4:39 am
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addict
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That vent line should remain UNCAPPED, and should run forward through the cross frame in front of the tank, and to a small one way valve (looks like a small fuel filter). From there it goes to the charcoal canister, located under the passenger seat area in most cases.
If you cap that line, the weirdest situation can develop. Under heavy load conditions- like pulling a trailer at 70 mph- the van will suddenly act like a fuel filter has clogged. Stumble, fart, burp, and she'll quit. If you wait ten minutes, OR open the fuel line (remove the filter), she runs fine for 20 or so miles.
This is caused by vacume building up in the tank bc the vent line is plugged (or pinched above the tank), gas is coming out, but air isnt replacing it.
Some tanks had all kinds of extra lines, depending on year. Some had inlets (4) at one corner of the tank. ONE must, somewhere, allow air back in.
The check valve allows air in, but fuel cant run out (supposidly).
If your gas cap doesnt fit snugly, this situation may never develop.

Re: workin' on the fuel tank
#87492 December 31st 2005 1:41 am
Joined: Nov 2005
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old hand
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When replacing my fuel pump I had "kinked" (folded) my vent tube on my van because I made them longer for easier access when lowering the tank. Since it wasn't completely blocked I didn't get that vacuum effect but it was a real PITA to fill up the tank. The pump would always stop and when it was almost full it would splash out. Gas on the vans paint! Gas on my shoes (which stank once I went in the van). Just make sure the vent system is working well. [Wink]


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