Lord Volvo
New member
- Joined
- Sep 9, 2010
- Location
- Dayton, Ohio
I'm venturing into (for me) uncharted territory - working on my Yellow Brick's fuel tank. I figure it would be easier to work on the tank by removing it. Some observations and questions if I may, and feel free to comment on anything.
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5822.jpg" border="0" alt=" photo DSCF5822.jpg"/></a>
Pressure builds up in the tank, causing fuel to seep out of (I think) the bung drain. I plan to use POR-15 sealant around the edges of the bung flange and some Loctite 567 for the threads, which is supposed to be fuel resistant but removable should the need arise. Is there a better idea for the threads?
And why are there two drains at the bottom of the tank? Did it come like this from the factory?
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5832.jpg" border="0" alt=" photo DSCF5832.jpg"/></a>
Someone either punched a hole and plugged it with a screw, or simply screwed the tank for whatever reason. This may be another source of leaks since the undercoating has dissolved around the screw. About a 1/2 inch of the screw is sticking inside the tank. What's the best way of approaching this - loctite the screw's threads, or remove it and plug the hole with something (epoxy?)
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5829.jpg" border="0" alt=" photo DSCF5829.jpg"/></a>
There was some rust and dirt inside the tank which I removed with a vacuum. The tank's bottom has some rust but it's not as bad as I had feared. I also can't see any signs of sludge or other types of buildup. I had planned on using POR-15's fuel tank restoration system but now wonder if it isn't worth the trouble. What do you think?
The fuel pickup tube at the top of the image just above the opened drain had some kind of black plastic wrap around it that had degraded and flaked off. I'm wondering if it helped extend the hose to closer to the tank's bottom because there seems to be a few inches of clearance between the hose and the tank's bottom. Is this normal?
I also found what appears to have been a small gasket with a screen that (I assume) fit on the hose's end as a pre-filter. Most of the screen was gone and the remains of the fitting was lying on the tank's bottom. Will this lack of a pre-filter cause a fuel filtration problem downstream or should I just change the regular inline filter more often?
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5830.jpg" border="0" alt=" photo DSCF5830.jpg"/></a>
The tank's flange has some surface rust which I plan to treat with POR-15.
Finally, what is the best sealant to seal the tank's flange to the body when it's reinstalled? I don't want a permanent seal in case I need to remove it again.
As for the pressure buildup, I'm either going to hook up an expansion tank and route it to a charcoal canister and route that to the carbs, or vent it to the atmosphere as a last resort.
Any input or advice is welcome!
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5822.jpg" border="0" alt=" photo DSCF5822.jpg"/></a>
Pressure builds up in the tank, causing fuel to seep out of (I think) the bung drain. I plan to use POR-15 sealant around the edges of the bung flange and some Loctite 567 for the threads, which is supposed to be fuel resistant but removable should the need arise. Is there a better idea for the threads?
And why are there two drains at the bottom of the tank? Did it come like this from the factory?
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5832.jpg" border="0" alt=" photo DSCF5832.jpg"/></a>
Someone either punched a hole and plugged it with a screw, or simply screwed the tank for whatever reason. This may be another source of leaks since the undercoating has dissolved around the screw. About a 1/2 inch of the screw is sticking inside the tank. What's the best way of approaching this - loctite the screw's threads, or remove it and plug the hole with something (epoxy?)
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5829.jpg" border="0" alt=" photo DSCF5829.jpg"/></a>
There was some rust and dirt inside the tank which I removed with a vacuum. The tank's bottom has some rust but it's not as bad as I had feared. I also can't see any signs of sludge or other types of buildup. I had planned on using POR-15's fuel tank restoration system but now wonder if it isn't worth the trouble. What do you think?
The fuel pickup tube at the top of the image just above the opened drain had some kind of black plastic wrap around it that had degraded and flaked off. I'm wondering if it helped extend the hose to closer to the tank's bottom because there seems to be a few inches of clearance between the hose and the tank's bottom. Is this normal?
I also found what appears to have been a small gasket with a screen that (I assume) fit on the hose's end as a pre-filter. Most of the screen was gone and the remains of the fitting was lying on the tank's bottom. Will this lack of a pre-filter cause a fuel filtration problem downstream or should I just change the regular inline filter more often?
<a href="http://photobucket.com/" target="_blank"><img src="http://i239.photobucket.com/albums/ff19/volvo1971/DSCF5830.jpg" border="0" alt=" photo DSCF5830.jpg"/></a>
The tank's flange has some surface rust which I plan to treat with POR-15.
Finally, what is the best sealant to seal the tank's flange to the body when it's reinstalled? I don't want a permanent seal in case I need to remove it again.
As for the pressure buildup, I'm either going to hook up an expansion tank and route it to a charcoal canister and route that to the carbs, or vent it to the atmosphere as a last resort.
Any input or advice is welcome!