After a 4.5 yr complete OE restoration on a 1970 Challenger RT/SE 440-6, I discovered that if I fill the gas tank to full, gas will leak from the rubber grommet that connects the filler tube to the gas tank until the level of the gas falls below the rubber grommet.

Question: Can the rubber grommet be replaced w/o dropping the gas tank? I.e. can the filler tube be pulled out of the grommet with the tank in place?

The car is immaculate, Gold Certified, worried about scratching newly coated OE parts.

Thanks for any help you can provide.