Fiberglass won't stick to ABS and the styrene plastic that holds the fiberglass patch together dissolves in gasoline. Put a little gas in an expanded styrene (i.e., Styrofoam) cup to see what you can expect. Check out the link for something that might work.
If it's cracked, it might be made of fiberglass, or plastic. Fiberglass patch or two part epoxy.
It depends on the type of the plastic, however it is safer to replace the tank, instead repairing it.
yes it will. be sure the surface is clean inside and out and free of paint and rust. make sure the edges of the hole are smooth and rounded. scuff the area with coarse sand paper. apply fiberglass and use a disposable rolller to push all the air out. if it is sticking to the roller use shopping bag to cover the fiberglass and resin on the tank before you roll it, or clean your roller. after the fiberglass dries, sand with 180 grit, lightly as to scuff it. clean with alcohol and prime it with a grey primer. fill any low spots with body filler. scuff with 240 grit. clean and prime again. fill any imperfections with glazing putty. finaly scuff the entire tank with 320 grit prime and paint to taste. method works with any fuel and any tank. higher grade fiberglass resin is recommended.
There is no safe way to repair a plastic fuel tank, you must replace it.
You can replace it. Or you get a plastic tank fix kit in AutoZone or Advance Auto Parts.
If you mean the plastic overflow tank, replace it. If you mean the plastic tanks on either side of the radiator core, replace the radiator.
yes
check your floats and make sure there is no rust in the tank and you have sufficient flow through your jets.
yes, otherwise its just another burden to take the time to fix later...
Floats on Yamaha 660 how you fix
There are emergence repair kits but I would suggest replacing ot for safety sake.
What type of Yamaha is this, just so I can order replacement parts and fix it up?