Re: Got a fuel tank vent leaking issue.
[Re: cbusters]
#2398246
11/04/17 01:58 AM
11/04/17 01:58 AM
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Posts: 36,840 South San Francisco, Californi...
MidPenMopar
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There was a time where 69 Roadrunner tanks had the vent lines switched inside the tanks on the repops. Switch the rubber hoses and see if it fixes it. Ok that's worth a try. I just dont understand why it was fine for two years and just now started leaking. I wonder if the line in the tank may have broken somehow and is sucking up fuel??
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Re: Got a fuel tank vent leaking issue.
[Re: 1969ronnie]
#2398822
11/05/17 02:02 PM
11/05/17 02:02 PM
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hi mid, yes your "j tube" is connected to the spectra short vent line that is only about 6"to 8" long in the tank. try to switch the rubber lines around to see if it solves the problem. more aftermarket headaches. ronnie Thank you guys for the good idea! I will try that for sure. Since this started happening something must have either come loose or broken in the tank.
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Re: Got a fuel tank vent leaking issue.
[Re: MidPenMopar]
#2398864
11/05/17 03:00 PM
11/05/17 03:00 PM
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Joined: Feb 2003
Posts: 16,146 Mesa, Arizona
dart4forte
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Are those Runner hoses designed for fuel? Do you fill up where the fuel has E85? May be the rubber is breaking down and slipping past where it's clamped. Looks to be the case on one of your lines. The culprit looks to be the outside hose since there's a fuel stain next to the clamp. With the fuel expanding I'll bet when you have a full tank the fuel shoots out of the path of least resistance.
Last edited by dart4forte; 11/05/17 03:55 PM.
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Re: Got a fuel tank vent leaking issue.
[Re: cbusters]
#2399251
11/06/17 11:04 AM
11/06/17 11:04 AM
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The way that is dripping on the edge and blowing forward on the shock, I would get a mirror and check out the sending unit seal if you haven't. The ethanol will blow them up also, or the seal could just be bad or not seated well. We have it up on the lift and it was leaking from the one vent that had the curved type metal tube end. No where else. So i will try switching the two and see what happens. Stu
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Re: Got a fuel tank vent leaking issue.
[Re: MidPenMopar]
#2399300
11/06/17 12:47 PM
11/06/17 12:47 PM
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Joined: Jan 2010
Posts: 667 Los Osos, Ca
CKessel
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Since it has been toasty throughout the state recently, you probably are experiencing lots of vaporization from the alcohol laden fuel and the stock venting has issues with keeping up. This will cause the tank to get pressurized and allow the leaks. You may want to revise your venting and improve it.
Carl Kessel
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Re: Got a fuel tank vent leaking issue.
[Re: MidPenMopar]
#2399759
11/07/17 01:24 AM
11/07/17 01:24 AM
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Joined: Jan 2010
Posts: 667 Los Osos, Ca
CKessel
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The fuel issue, like yours, has been an ongoing discussion on the FBBO site. One guy tested the current pump swill and found that the fuel boils at 150*. Think about that. Your engine is running, on the coolant, at 180* or more. Mix in the radiated exhaust heat plus other heat sources. On my own 65 Coronet, after driving it for 20 minutes or more, would have the fuel boiling in the tank. Car has 3" TTI exhaust that at that area has anywhere from 1" to a little more for clearance between the pipes and the tank. The car would be fun to drive since it was blubbering from fuel boiling in the carb too. I put on a carb heat shield plus used the blocked off heat riser intake pan shield/gasket and that helped on the engine side but the other end was still an issue. For sure we need better venting back there. Is your fill cap vented or non vented? Mine was vented but I still got a whoosh when it got opened.
Carl Kessel
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Re: Got a fuel tank vent leaking issue.
[Re: CKessel]
#2399871
11/07/17 11:15 AM
11/07/17 11:15 AM
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Mine was vented but I still got a whoosh when it got opened. I have a vented cap and well. I checked it over to make sure nothing to make it looked fine. This issue just started recently and even happened ( to a much lesser extent) at my buddies shop when the car was sitting and the engine cold. When it happened to me at a car show last month it dripped out steadily from both side of the tank like it had a hole in the tank for a solid hour. I thought the seam had gone bad but that not the care as on the life you can see it coming out of the smaller curved vent tube.
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Re: Got a fuel tank vent leaking issue.
[Re: MidPenMopar]
#2399907
11/07/17 12:54 PM
11/07/17 12:54 PM
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Joined: Jan 2010
Posts: 667 Los Osos, Ca
CKessel
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Maybe check the vent line and make sure there are no restrictions. On the "Tanks Inc" site, they say not to use the commonly done curly cue vent that some people make as it can collect liquid in the low spots, from the fuel condensing after cooling off, causing a restriction in the venting. My neighbor had a tank made out of aluminum, bad choice btw, with the vent done that way. He has fun filling it sometimes because that vent is restricted. I need to make a straight one for him down the road.
Carl Kessel
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Re: Got a fuel tank vent leaking issue.
[Re: CKessel]
#2400091
11/07/17 07:03 PM
11/07/17 07:03 PM
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Joined: Feb 2003
Posts: 16,146 Mesa, Arizona
dart4forte
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Mesa, Arizona
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My bet is the fuel vapors are pushing past the hose clamp and that the hose needs to be replaced. Also, since you were see fuel on both sides I'll bet the fuel is running down the seam and dropping on the other side of the car.
Last edited by dart4forte; 11/07/17 07:04 PM.
“So if it’s on the internet it must be true”
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Re: Got a fuel tank vent leaking issue.
[Re: CKessel]
#2403788
11/15/17 12:19 AM
11/15/17 12:19 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Balt. Md
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The fuel issue, like yours, has been an ongoing discussion on the FBBO site. One guy tested the current pump swill and found that the fuel boils at 150*. Think about that. Your engine is running, on the coolant, at 180* or more. Mix in the radiated exhaust heat plus other heat sources. On my own 65 Coronet, after driving it for 20 minutes or more, would have the fuel boiling in the tank. Car has 3" TTI exhaust that at that area has anywhere from 1" to a little more for clearance between the pipes and the tank. The car would be fun to drive since it was blubbering from fuel boiling in the carb too. I put on a carb heat shield plus used the blocked off heat riser intake pan shield/gasket and that helped on the engine side but the other end was still an issue. For sure we need better venting back there. Is your fill cap vented or non vented? Mine was vented but I still got a whoosh when it got opened. That is so true. This pump gas we get today is junk. I had some issue when mine started to boil in the carb. This was back a few years when the gas started to get worse. At first I thought my needle and seats were bad as it was boiling the fuel out the carb internal vents into the eng and loading up. I put a 1" phenolic spacer on it and a heat shield and moved the fuel line away from the eng heat as much as I could and it took care of it. Makes sense if the fuel gets hot enough in the tank as I have not had that problem but I do know they change to winter blend here in Md where I live and then back to summer around April as I got gas in March last year and when sitting in traffic for a long while on a 70 degree day I switched my electric pusher fan on in front of the rad when the eng was at 185 and to my surprise the fuel started to boil in the carb as soon as the pusher fan pushed more rad heat over the eng. And the eng never went over 185 I just turned on my electric fan because it looked like I would be there a while. It would never do that on summer fuel as I sat for a 1/2 hr in the summer with my electric fan running and the car never went over 185 and I had no problem at all. This pump gas is junk. Ron
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