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fuel tank drain plug
https://www.slantsix.org/forum/viewtopic.php?t=42953		 Page 1 of 1
Author:  Tim Keith [ Mon Dec 20, 2010 9:25 pm ]
Post subject:  fuel tank drain plug
I've dropped the fuel tanks from a couple vehicles.
Other than transmission pan drain plugs is there any
drain plug designed for fuel tanks ? I looked on Summit
and JEGS but did not see any specific plug. I think some
of the EFI companies sell fuel tank drain plugs. I don't
want to weld the tank.

I think the common procedure is to use a suction
pump to drain the gasoline from the tank. I'd like a
simple drain plug that is relatively flush with the
metal surface so that its not so easily damaged
from road debris.

The kind of thing I'm thinking of is three piece : a flat
washer like flange for the bottom integrated with a
a threaded shaft that protrudes into the tank, with a
female threaded flange on the inside sealed by a
o-ring, with a brass removeable plug to drain the fuel
that has an reccesed allen head that is flush when
tight.
Author:  4speed [ Mon Dec 20, 2010 9:29 pm ]
Post subject: 
My 36 and 54 Plymouths both had factory drains in the fuel tanks-I see no reason you could not have one put in. But most welding shops do not like to weld on gas tanks.
Author:  Greg Ondayko [ Tue Dec 21, 2010 4:06 am ]
Post subject: 
I have seen some tank shops Solder them in after they boil out the tank.


Greg
Author:  carlherrnstein [ Thu Dec 23, 2010 9:30 am ]
Post subject: 
Fuel tank drain plug, connivent way to steal fuel :wink:

The best way to put one in wound be to soft solder it in with a soldering iron there no flames to ignite the fumes.
Author:  4speed [ Thu Dec 23, 2010 9:44 am ]
Post subject: 
Well that would be easy but lead makes a lousy mechanical bond. Can spring leak when you do not want it to. Best to get it mig welded. They can weld to the tank. They fill it with water and hold a flame near a opening and wait to see if it will go whoosh! Then its safe to weld.
Author:  Tim Keith [ Sat Dec 25, 2010 8:45 pm ]
Post subject: 
Both tanks have fuel return lines, for one of the tanks the purpose is for a charcoal cannister, the other is for EFI. Could I extend the return lines to the bottom of the tank and then use the return line with an electric fuel pump to drain the tanks?
Author:  carlherrnstein [ Sun Dec 26, 2010 4:48 pm ]
Post subject: 
Lead makes a strong enough bond to hold in +- 15psi in the radiator/heater core.

Tom extending a unused or extra tube in the tank and using a electric pump would work well. I don't think I would use the tube for the charcoal cannister cause, that item puts the explosive fuel vapors in the intake manifold were they belong.
Author:  olafla [ Mon Dec 27, 2010 8:12 am ]
Post subject: 
Hi, Tim.

I don't know why you need to drain the tank, but if it is full of gunk, that gunk will just block your drain pipe all the time, if it is of small diameter. Can't you simply drain it with a hose down the filler neck, like any fuel thief does? Just mind the potential static discharges, use a ground strap.

Anyway, I also miss a good sized drain plug in the tank.

Olaf.
Author:  4speed [ Mon Dec 27, 2010 10:01 am ]
Post subject: 
Quote:
Lead makes a strong enough bond to hold in +- 15psi in the radiator/heater core.
Well think about it-the radiator/heater core uses crimped over tabs and seams before the lead (used as a seal only) is applied. Even then I have seen radiators that have failed and un-zipped a seam. My own 50 Chryslers radiator had a small area of the crimp fail on the top tank. The lead would not hold up to a 4 psi pressure and leak there all the time. Found a NOS radiator at Rhinebeck show for 40.00 and no problems now.
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