fuel tank lock ring
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
fuel tank lock ring
How common or uncommon is it for these o-rings to fail?
I honestly didn't think they failed at all but my rear tank is seeping gas from the lock ring area.
I cleaned it up and couldn't see anything else that could be causing it.
Wet right in that channel and on the tank below it.
My 79 started to do this and it was because I didn't smack it hard enough when I installed it.
A few whacks and it hasn't done it since.
I just did the same thing to the 86 but it didn't look like it moved much if at all.
So it appears the o-ring failed. Better than a rotted tank though..
I honestly didn't think they failed at all but my rear tank is seeping gas from the lock ring area.
I cleaned it up and couldn't see anything else that could be causing it.
Wet right in that channel and on the tank below it.
My 79 started to do this and it was because I didn't smack it hard enough when I installed it.
A few whacks and it hasn't done it since.
I just did the same thing to the 86 but it didn't look like it moved much if at all.
So it appears the o-ring failed. Better than a rotted tank though..
Lead Driver
Joined: Apr 2002
Posts: 5,317
Likes: 1,243
Could be a loose fuel line. The locking ring gaskets are pretty tough and if you got it in there straight and tightened the lock ring all the way to the stops, I'd look a little closer at the fuel line connections.
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
That was the first thing I thought too. they appeared dry but I also didn't try to tighten them up.
The fuel line connections looked like little plastic tab connectors if I recall.
Never worked with them always used the worm gear clamps, can you tighten them or replace them with a clamp?
fuel line was a tubing of some sort. I didn't pay too much attention other than I noted it wasn't metal or rubber.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
Does this truck (the 86?) have in tank pumps?
It sounds like the lines on a EFI setup.
I think you pull that tab out and then can pull the line off the sender.
I would say if you don't know the shape of the O-Ring seal I would get a new one with a new lock ring and replace them
Dave ----
It sounds like the lines on a EFI setup.
I think you pull that tab out and then can pull the line off the sender.
I would say if you don't know the shape of the O-Ring seal I would get a new one with a new lock ring and replace them
Dave ----
Thread Starter
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
Does this truck (the 86?) have in tank pumps?
It sounds like the lines on a EFI setup.
I think you pull that tab out and then can pull the line off the sender.
I would say if you don't know the shape of the O-Ring seal I would get a new one with a new lock ring and replace them
Dave ----
It sounds like the lines on a EFI setup.
I think you pull that tab out and then can pull the line off the sender.
I would say if you don't know the shape of the O-Ring seal I would get a new one with a new lock ring and replace them
Dave ----
I agree, if it doesn't stop seeping I am going to drop the tank and replace it.
I appreciate dual tanks, I can at least run that one down so it won't be too bad dropping it.
It isn't EFI but it may have been at one point. I don't know, it has a carb on it now
but you definitely called it with the tabs.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
You may be right on the 460's and in tank pumps and if so then the lines you see would have them special tab clamps to hold them.
I think I posted to pick up a new O-ring and lock ring, run the tank down and drop it and install the new parts.
You can also check it over better on the ground then.
Dave ----
I think I posted to pick up a new O-ring and lock ring, run the tank down and drop it and install the new parts.
You can also check it over better on the ground then.
Dave ----
Lead Driver
Joined: Apr 2002
Posts: 5,317
Likes: 1,243
Run the offending tank low, or remove fuel and see if it still leaks the same. With a low amount of fuel it's more likely that the issue is the fuel lines if it's still wet on top. Is this your front or rear tank that leaks?
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Fleet Mechanic
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From: NE Ohio
they both do actually,
the lock ring issue is with the rear though.
The only place I noticed wetness was right there in the lock ring crease, I didn't notice any staining from gas running down something.
I checked if anything else was damp etc. Fuel lines were first thing I checked and they looked good.
I'll check it again when I run that tank down.
the lock ring issue is with the rear though.
The only place I noticed wetness was right there in the lock ring crease, I didn't notice any staining from gas running down something.
I checked if anything else was damp etc. Fuel lines were first thing I checked and they looked good.
I'll check it again when I run that tank down.
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Lead Driver
Joined: Apr 2002
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they both do actually,
the lock ring issue is with the rear though.
The only place I noticed wetness was right there in the lock ring crease, I didn't notice any staining from gas running down something.
I checked if anything else was damp etc. Fuel lines were first thing I checked and they looked good.
I'll check it again when I run that tank down.
the lock ring issue is with the rear though.
The only place I noticed wetness was right there in the lock ring crease, I didn't notice any staining from gas running down something.
I checked if anything else was damp etc. Fuel lines were first thing I checked and they looked good.
I'll check it again when I run that tank down.
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