Firstly, empty the tank. Either drive it until it's on res and then let it idle till death (might take awhile). Or clamp off the res line, then unplug it from the carburetor, and let the fuel drain into a gas can.
Once the tank is empty, unscrew the screws holding it to the frame. Then reach your hand inside the battery compartment and feel around for the lines. Unplug the lines from the tank. You can clamp the lines first (I like to use mosquito clamps) before removing them to ensure no spillage from left over fuel in the lines. Chances are you'll spill a bit on yourself, so wearing petroleum proof gloves (made from nitrile) helps.
Remove the tank and leave the lines in place. When your tank is ready, just replace the tank, reach your hand into the battery compartment, and replace the lines. Just remember which line is which (I clamp the mosquito clamps at different areas ex: the one clamped at the very tip of the line is res and the one with the camp further down is on).
I had to replace my lines because the previous owner used some cheap plastic tubing that got hard and cracked. I replaced them with automotive fuel lines. It was a pain to get them in through the small opening in the frame. But once the gas tank is out, it'll be a lot easier to work with. Also if you don't have them already, get some of those line clamps to keep them secure and not leaking. I also put in some fuel filters on the new lines. I think I used 8 of those little fuel line clamps in all.
Good luck!
-Jon
--- In Honda-C70@yahoogroups.com, Chris Bader <bader_ct@...> wrote:
>
> Hi,
>
> I buy mini corks to plug the fuel lines after removal so as to avoid fuel spilling everywhere.
>
> Thanks,
>
> Chris
>
>
>
> ________________________________
> From: mark.north29 <north@...>
> To: Honda-C70@yahoogroups.com
> Sent: Thursday, August 25, 2011 9:52 AM
> Subject: [Honda-C70] Gas Tank Removal
>
>
> Â
> I'm about to remove the gas tank on my '82 c70 and take it in to be cleaned. Any suggestions about the procedure to remove. I'm particularly concerned about rerouting the fuel lines once they've been pulled out.
>
> Mark
>
>
>
>
> [Non-text portions of this message have been removed]
>
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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