I parked my truck, with a full tank, on my fairly steep drive way, which I normally don't use with this truck and noticed a pretty good leak coming from somewhere on the top of the tank. Only did it once but I really didn't try it again with a full tank.

Today I dropped the tank and couln't see anything that really stood out as a leak location. There is some fuel seepage marking comming from both vents. I assume they are vents though this is the first time I have dropped the tank and I haven't read anything that mentioned them.

Anyone else have a similar leak and traced it to the vents?

Any other ideas?

 

Anybody replaced the tank vents? How do they come out?

 

How full was it when you parked it on the hill. Older gas tanks had vents untill the evap laws went into effect, but from my understanding deisels did not fall under the same evap laws of gas because deisel does not evaporate the way gas does.
I would say that if the tank was pretty close to full, and the hill was pretty steep, but it does not do it on most smaller grades, then I would not worry to much about it.

As for replacing the vents/pressure release valves. Some vehicles twist/screw in, but most just push in. Give them a few turns if that doesn't go anywhere then gently try to pry them up. Have the spares on hand with new seals, sometimes they do break.

 

While I don't have an answer for you other than maybe a new gasket under that tank cap, if there is one under there, this would be a great time to do the hutch and harpoon mod discribed on Guzzles site.

 

I have had a few times after filling up my bike and them parking it in the garage, it will start leaking from "leaning" on the kickstand, so now I am just in the habit of filling at a station far enough away that I burn off the "extra" before I get home, Just incase I go too far. That is just the way some things are. And since your tank was FULL then I would just not park in driveway with anything over 1/2 or 3/4 tank.

 

Looks like the vents are not replaceable on this truck. They must come with a new tank. I will try living with it for awhile; but it may drive me crazy just knowing it is that way.

 

I did the hutch mod on mine a few weeks ago, and looked under the truck yesterday to see where there had been fuel on the side of the tank, coming from somewhere up top. Dropping that tank is a real PITA man. I took the bed off in 30 minutes! I'll never drop the tank again if I gan help it. Cleaned off the top of the tank, took and filled the truck up, and sure enough, there was a hose clamp that I hadn't tightened down all the way. It's WAY easier to pull the bed, IMHO.

 

if the vent tubes leak with a full tank, parked on a hill, how about linking the 2 with fuel line, conncted to a "T" barb, then run'n that line up high ,then looped around something? This should stop the leak.

 

The leak seems to be where the valve goes into the tank itself. I don't know how they assemble them with the plastic tanks but from what I read they can't be replaced. On the metal tanks it looks like they use the same valve and they can be replaced by a quarter turn and out. Book says they can't be replaced on the siide mounted plastic tanks. When I had the tank out I felt under there but really didn't see how they work. Forward one also has some staining from a small seep around the valve.

I looked on Ed's website and they really didn't list the price for a new tank but only gave a estamate and it seemed expensive.

Anyone know of a sealent that would work on plastic with diesel under it?

From what I can see these must be to let air into the tank as the level goes down and not to let pressure out.

 

I think it has a ball valve in it that if the fuel goes up to high the ball floats and plugs the vent. Not 100% sure but that's what I thought it was.