Brown paper bag paper and a hot covering iron will draw out some. The acetone on a rag wipe mentioned above helps, too. 91% isopropyl or stove/solvent alcohol on a rag works as well as acetone and is cheaper (castor oil is alcohol soluable). Use a hair drier to evaporate out the alcohol after wiping with a soaked rag and repeat wherever you can reach.

I always paint the tank area with thinned epoxy and, depending on the design, any likely spots fuel may leak. A ruptured tank is worst case because so much fuel has a chance to get everywhere.