Gas tank line

smhnevada wrote:
Hi! I have a 2006 Winnebago Itasca, Class A, gas. Last year I had camping world drop the gas tank to rehook up generator fuel line.
Now that I took it out of storage and filled the tank I noticed that gas is dripping fairly regularly onto the ground. I crawled under the rig and found the source of the drip. The connector on the line going into the tank is apparently not tight. It is the small line that follows the larger line from the gas tank to where gas is added to the rig. This small line seems to go back into the large gas line right before one would insert the gas nozzle to fill the tank. Does anyone know what this line is for? I would like to know before I start monkeying around trying to tighten things. I am not a mechanic and am not sure I know what I am doing. The rubber connection under the rig going from this small line to the gas tank seems to slightly crimped in addition to leaking at that point.
Thanks in advance for any help I might get.
Steve

That describes the gas tank VENT line.
Allows tank to be vented while filling with gas (air/vapors have to exit while liquid goes in)

Connection at each end (tank and filler tube) should be tight
Vent line and any connectors should be straight....no kinks/twists/crunches/crimps etc.

I bought a used MH and the first time I filled it up there was a water fall under the coach.

Took 4 techs to finally figure it out it was the vents because it only happened if I passed the line in the tank where they were located when filling up with gas. Keep the gas in the tank below no leakage.

Found out the actual 'vents' themselves had come loose! I had them repaired.

Fast forward 4 years I hit a pothole (thank you Atlanta) and the vents came out again. I can fill the gas up to only a certain point, past that where the vents are located and it leaks.

Check the actual vents. The gas can be leaking down towards a line and actually be coming from a loose or lost vent.

Hopefully just a connection that wiggled loose and can be fixed easily.

Having said that, I'm broke down right now because of similar problem. Noticed fuel dripping out. Had to drop tank and leak turned out to be a little black cap covering a hole (evap line?). It's 16 years old, so I replaced the sending unit. Now it's sucking air somewhere so tank has to dropped again:M. Of course this couldn't happen at home and the RV park we're in obviously won't let me drop tank, so paying $95.00 hour to have shop do it, and a tow bill.

If you have to pull tank, highly recommend a new suction tube by FASS (if vehicle out of warranty) My new sending unit, the straw is so weak. New sending unit has a cheap plastic suction tube on the new sending unit, so going with something heavier duty.

Also make a new fuel line and put in test port for low fuel pressure, could save big hassles later. That is if there isn't any way to check fuel pressure or gauge at present time.

http://www.fassride.com/shop/accessories/suction-tube-kits.php

Something to ponder...Also hope your tank is pretty empty. Mine was full (35 gallon in a pick up). It was cheaper for me to give fuel away than buy 7 fuel containers.

Good luck

smhnevada wrote:
Hi! I have a 2006 Winnebago Itasca, Class A, gas. Last year I had camping world drop the gas tank to rehook up generator fuel line.
Now that I took it out of storage and filled the tank I noticed that gas is dripping fairly regularly onto the ground. I crawled under the rig and found the source of the drip. The connector on the line going into the tank is apparently not tight. It is the small line that follows the larger line from the gas tank to where gas is added to the rig. This small line seems to go back into the large gas line right before one would insert the gas nozzle to fill the tank. Does anyone know what this line is for? I would like to know before I start monkeying around trying to tighten things. I am not a mechanic and am not sure I know what I am doing. The rubber connection under the rig going from this small line to the gas tank seems to slightly crimped in addition to leaking at that point.
Thanks in advance for any help I might get.
Steve

Why don't you follow the line in question to the end of both ends, and answer your own question?

Sounds like the return line from the engine, to me.
The normal vent parallels the fuel inlet line. The return line follows the fuel pump line to the EVAP canister.

Straighten that line if possible so it isn't crimped and put a hose clamp on it. I wouldn't want a gas drip even if it is a vent line.

yep, i meant to mention that if you "top off" (really fill it as high as it can go) that you may see "drippage" as you drive and especially as it heats up and expands in the tank.

Oldracer, thanks for the quick response. A vent line makes sense. I did top off the gas tank so their probably is gas running up into the vent line and I just need to run the RV a while to get the gas level down.

probably a vent line, allows air to escape the tank during temp changes.