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Gas Venting Problem
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Author:  69a100 [ Mon Jun 23, 2008 2:10 pm ]
Post subject:  Gas Venting Problem
Dodge A-100 w/225, here's the deal. With more than 1/2 tank of gas after a drive I have had a bad gas smell after shutdown. Upon opening the fuel cap, I get a rush of air and a backwash of gas. The fuller the tank, the worse the problem and this mostly happens in hotter weather. I used to have another cap that wouldn't even seal and would just get gas leaking out so I know my system is sealed now. Picture of system is here, http://www.sweptlineparts.com/fuel/14-03.gif BUT, look at the pick-up truck and you will see a tube that vents into air as where mine does not. http://www.sweptlineparts.com/fuel/14-01.gif Do I need to do the same or what? I have been thinking about doing the Dan thing with the front line and don't see how that would even come into play with my problem, I may be wrong though. This is driving me nuts and need some idea's and input.!!! Thanks
Author:  SlantSixDan [ Mon Jun 23, 2008 2:59 pm ]
Post subject: 
Interesting that no tank vent is shown on your A100 parts diagram. Your fuel tank must be vented, and in 1969 all tank vents were external/atmospheric. I'm not sure whether your fuel tank vent is blocked, kinked, or has been removed or misconnected, or is just plain absent, but you will need to clear, fix, and/or create it. Take note of the steep uphill-downhill in the vent line on the truck diagram. That's to prevent liquid fuel leaving the vent except in very extreme overfill situations.
Author:  blue62val [ Mon Jun 23, 2008 4:22 pm ]
Post subject: 
Quote:
Interesting that no tank vent is shown on your A100 parts diagram. Your fuel tank must be vented, and in 1969 all tank vents were external/atmospheric. I'm not sure whether your fuel tank vent is blocked, kinked, or has been removed or misconnected, or is just plain absent, but you will need to clear, fix, and/or create it. Take note of the steep uphill-downhill in the vent line on the truck diagram. That's to prevent liquid fuel leaving the vent except in very extreme overfill situations.
I don't suppose anyone has a picture of the venting pipe on a 60 - 62 Val ?

Peter
Author:  SlantSixDan [ Mon Jun 23, 2008 5:36 pm ]
Post subject: 
I've got a picture of it in my mind...! :mrgreen:

For some strange reason, even though I know these cars do have a vent line as described, it's left off the illustration in the FPC. :-(
Author:  69a100 [ Tue Jun 24, 2008 8:56 am ]
Post subject: 
Quote:
Interesting that no tank vent is shown on your A100 parts diagram. Your fuel tank must be vented, and in 1969 all tank vents were external/atmospheric.

That's what puzzles me. All A-100s from 64-69 are all the same. So I ask myself what's going on with this. My 66-300 is vented like the truck with a high upward/downward tube.
Quote:
I'm not sure whether your fuel tank vent is blocked, kinked, or has been removed or misconnected, or is just plain absent, but you will need to clear, fix, and/or create it.
From every check I've done, all seems to be good.
Quote:
Take note of the steep uphill-downhill in the vent line on the truck diagram. That's to prevent liquid fuel leaving the vent except in very extreme overfill situations.
That's kinda my next plan of attack, make up a T fitting and with a brake tube for the vent and just twist it up and fab something and keep my fingers crossed.
Author:  SlantSixDan [ Fri Nov 20, 2009 4:40 pm ]
Post subject: 
Tee into the tank-to-fillpipe vent line. Use short lengths of fuel hose to connect to same-diameter metal hardline bent into a high upside-down "U" then running down to vent to atmosphere below the truck, not sticking down so far as to get damaged by road debris. Refer to the added red line here (it doesn't interface with the fuel cap surface, it passes the fillpipe on its way back down):

Image
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