I'm sorry I misread i thought you ment for a fuel pick up. Yes as others have said CA glue will work just fine. Sorry about leading you the wrong way. You can put holes in tanks as long as you seal them with fuel resistant sealant. I would go the CA route tho. You can also use some 3m clear double sided tape. The stuff is sticky as as anything, and won't stop the tank from flexing like a hard spot of CA.