Slow drip from gas tank drain plug...
- TechMOGogy
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- Location: Ontario, Canada
Slow drip from gas tank drain plug...
So I have a very slow drip from the gas tank drain plug.
I managed to remove the plug and reanneal the copper washer, then smoothed it out with 600 grit sand paper on glass so it was super flat - still drips!
Off to the store and got their last two 22mm ID copper crush washers (900.4230) - yippie - installed one and it still drips.
The plug threads in and out easily so no issues there.
Should I try 2 crush washers?
Some sort of thread seal plus the crush washer?
Any thoughts or tricks I am missing here?
Thx
Dan
I managed to remove the plug and reanneal the copper washer, then smoothed it out with 600 grit sand paper on glass so it was super flat - still drips!
Off to the store and got their last two 22mm ID copper crush washers (900.4230) - yippie - installed one and it still drips.
The plug threads in and out easily so no issues there.
Should I try 2 crush washers?
Some sort of thread seal plus the crush washer?
Any thoughts or tricks I am missing here?
Thx
Dan
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
Re: Slow drip from gas tank drain plug...
Hi Dan,
I developed the same problem after removing the tank to install a new pick-up tube. About 1 drop every 2-3 days. Tried a new crush washer to no effect. I was nervous about wrenching it too much and maybe cracking the weld so I just left it. Now (about 3 months later) it doesn't drip any more. Good karma maybe?
I'd try some thread sealing tape or a fibre washer on the plug.
Paul
I developed the same problem after removing the tank to install a new pick-up tube. About 1 drop every 2-3 days. Tried a new crush washer to no effect. I was nervous about wrenching it too much and maybe cracking the weld so I just left it. Now (about 3 months later) it doesn't drip any more. Good karma maybe?
I'd try some thread sealing tape or a fibre washer on the plug.
Paul
Paul C.
_________
'73 Swiss 710M
'89 Puch 230GE
_________
'73 Swiss 710M
'89 Puch 230GE
- TechMOGogy
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- Joined: Wed Feb 01, 2012 11:39 am
- Location: Ontario, Canada
Re: Slow drip from gas tank drain plug...
I did it again (3rd times a charm) used a new crush washer and some aviation sealant and I think it finally got it!
Fingers crossed - will verify in the morning
Thanks Paul
Fingers crossed - will verify in the morning
Thanks Paul
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
Re: Slow drip from gas tank drain plug...
Hmmmm, gas is a decent solvent that leak might develop again
If it does try cranking in that plug finger tight without a washer and see
if you can detect a valley point around the circumference of the seat on
either the plug or tank side, e.g. a gap. If you can get a 2 or 3 mil feeler
gauge in there at any point that would take some crushing to close.
As you apply force to crush you don't want to "stop" then tighten more as
then the copper stops flowing and takes a harness. A torque wench would
take the guess work out of it but the torque for these plugs is not spec'd in
the Manual.
I have shied away from using Aluminum washers on fuel systems, but they
are pretty common for high pressure AN fuel fittings. Might give that a try if
the problem persists.
If it does try cranking in that plug finger tight without a washer and see
if you can detect a valley point around the circumference of the seat on
either the plug or tank side, e.g. a gap. If you can get a 2 or 3 mil feeler
gauge in there at any point that would take some crushing to close.
As you apply force to crush you don't want to "stop" then tighten more as
then the copper stops flowing and takes a harness. A torque wench would
take the guess work out of it but the torque for these plugs is not spec'd in
the Manual.
I have shied away from using Aluminum washers on fuel systems, but they
are pretty common for high pressure AN fuel fittings. Might give that a try if
the problem persists.
Puller: 71' 710K 2.7L EFI aka Mozo
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712MK
Driver: Ron // KO0Q
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712MK
Driver: Ron // KO0Q
Re: Slow drip from gas tank drain plug...
I just put some petrol compatible sealant on the threads and use the recommended washers and never had an issue.
1973 Haflinger AP700
1977 Landrover FC 101
2007 Range Rover Sport TDV6
1971 Jaguar Series 3 E-Type Conv
1957 Landrover 88" Station Wagon
1957 Landrover 88"
1977 Landrover FC 101
2007 Range Rover Sport TDV6
1971 Jaguar Series 3 E-Type Conv
1957 Landrover 88" Station Wagon
1957 Landrover 88"
- TechMOGogy
- Posts: 2831
- Joined: Wed Feb 01, 2012 11:39 am
- Location: Ontario, Canada
Re: Slow drip from gas tank drain plug...
The Permatex #3 aviation sealant is fuel resistant so we shall see.
On the plus side, I am now an expert at removing the plug with basically a full tank of gas (and Andre's tank guard that makes it a bit harder).
On the plus side, I am now an expert at removing the plug with basically a full tank of gas (and Andre's tank guard that makes it a bit harder).
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
Re: Slow drip from gas tank drain plug...
Curious how you pull that plug on a full tank without getting a gasoline shower
Puller: 71' 710K 2.7L EFI aka Mozo
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712MK
Driver: Ron // KO0Q
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712MK
Driver: Ron // KO0Q
- Jack Russell Racing
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Re: Slow drip from gas tank drain plug...
rmel wrote:Curious how you pull that plug on a full tank without getting a gasoline shower
Well obviously he flips the truck upside down!
Ricambi America. The Ferrari, Maserati, Lamborghini Parts Specialists
- TechMOGogy
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Re: Slow drip from gas tank drain plug...
Dam! Never thought of that!!Jack Russell Racing wrote:rmel wrote:Curious how you pull that plug on a full tank without getting a gasoline shower
Well obviously he flips the truck upside down!
Basically it was a fast game of 1 finger Lucy... plug out and finger in.
As always, the first time was not fun, but by 2nd and 3rd I lost less than a cup or two.
Hopefully, I don't have to do that again and if for some reason I do the tank will be near empty and I will just drain it.
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
- audiocontr
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- Location: Buffalo NY
Re: Slow drip from gas tank drain plug...
Can you place a plastic bag between the cap and the filler tube to limit the amount of liquid which pours out?
1973 712m
1968 Haflinger
1965 Pathfinder
1978 GMC Palm Beach (Hey, its got 6 wheels!!)
1968 Haflinger
1965 Pathfinder
1978 GMC Palm Beach (Hey, its got 6 wheels!!)