Fuel tank leak
Thread Starter
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Mountain Pass
Joined: Mar 2010
Posts: 183
Likes: 27
From: Northern CA
Fuel tank leak
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?
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?
Elder User
Joined: Nov 2004
Posts: 684
Likes: 1
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.
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.
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
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.
Elder User
Joined: Nov 2004
Posts: 684
Likes: 1
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.
Thread Starter
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Mountain Pass
Joined: Mar 2010
Posts: 183
Likes: 27
From: Northern CA
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.
Senior User
Joined: Jan 2003
Posts: 171
Likes: 0
From: Jacksonville
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.
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Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
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.
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Thread Starter
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Mountain Pass
Joined: Mar 2010
Posts: 183
Likes: 27
From: Northern CA
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 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.
Last edited by White 99; Dec 22, 2011 at 11:03 PM. Reason: Typo
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