Hungate played on Toto's first four records, including multiple Grammy award-winning album, Toto IV. He left the band shortly after its release for a career as a session musician in Nashville. Hungate, who plays many instruments including guitar, trumpet, drums, and piano, has arranged, produced and recorded with several country artists such as Chet Atkins. In 1998, Hungate rejoined his former TOTO bandmates in Europe for a series of live shows promoting Toto XX: 1977–1997, an archive release of previously unreleased studio & live songs. He was also a primary member of AORsupergroup Mecca fronted by Joe Vana and Fergie Frederiksen, the latter also of Toto fame. In 1990 he released a solo album entitled "Souvenir" (on CBS). Jeff Porcaro played drums on some of the tracks on the album.
As of 2012, Hungate still resides in Nashville and is still an active and highly sought-after studio musician and on occasion tours with top acts such as Vince Gill. As of 2014, he has rejoined Toto in a touring capacity due to the departure of the touring bass player, Nathan East (who was, like Leland Sklar, filling in for regular bassist Mike Porcaro who was forced to retire due to illness). At first, it was announced that he would retire after the 2014 tour, but he will start 2015 touring with Toto, as stated by Lukather in October, due to Porcaro's death.  He also contributed some bass guitar on Toto XIV.
In 2015, it was announced that David Hungate will no longer play with Toto. He will be replaced by Leland Sklar.