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Old 05-11-2011, 10:43 PM   #1
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1984 31' Airstream310
College Station , Texas
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Extra fuel tank line?

My 1984 310 has a 40 gal fuel tank. For some reason it has 4 fuel lines: one to fuel pump, one return, one to generator, and one that is just there. I discovered the fourth line when I filled the tank to capacity, it overflowed onto the ground. Not the most pleasant thing to occur at a fuel stop. Does anyone have any idea what's was the intended use for the extra line. Can I simply plug the line?
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Old 05-11-2011, 11:16 PM   #2
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1982 28' Airstream 280
Port Angeles , Washington
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Quote:
Originally Posted by pdallas View Post
My 1984 310 has a 40 gal fuel tank. For some reason it has 4 fuel lines: one to fuel pump, one return, one to generator, and one that is just there. I discovered the fourth line when I filled the tank to capacity, it overflowed onto the ground. Not the most pleasant thing to occur at a fuel stop. Does anyone have any idea what's was the intended use for the extra line. Can I simply plug the line?
I can't speak for sure about your tank but on mine which is 60 gal and a diesel there are several spare ports on top of the tank. I guess they put extras in for more than one application.

I too found the existence of an open port the first time I filled the tank. I dropped the tank and there are two ports with pick up tubes and several return/vent ports. One unused port had a 90 degree elbow and no plug. I don't recall how the vent was set up, fading memory, but I brazed an elbow in the filler tube near the top and ran a hose from the open elbow. I thought it might help vent some air and foam during fill up.

Cheers, Dan
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Old 05-12-2011, 12:12 AM   #3
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1985 31' Excella
Fresno , Texas
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I think it is a vent line. My in bed 98 gallon diesel tank has a vent ell reducer down to 1/8" and a few more penetrations that are plugged on the top then it has the gravity feed fitting on the bottom that feeds into the neck of the truck fill tube.
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Old 05-12-2011, 12:17 AM   #4
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2005 25' Safari
Salem , Oregon
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Hi, possibly for a carbon canister that someone disconnected or removed?
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Old 05-12-2011, 10:32 AM   #5
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1986 34.5' Airstream 345
Key West , Florida
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Mine (345 80gal) had one line that led to a carbon canister on the pass side of the raidiator. I think it is both a vent and a return from the carbon canistor.
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