well the unofficial encyclopedia is a huge form of info for me :)
i copied this part wich shows some info about this incident:
Fett was thought to have been killed in the Sarlacc's acid-filled belly, but he managed to set of a series of explosions which destroyed much of the beast and allowed him to escape. Note that Marvel Comics' Star Wars issue 81 showed Boba Fett being "rescued" by the Jawas from the Sarlacc pit, only to fall back in when the Jawas' sandcrawler fell into it. He lay dying in the twin suns of Tatooine until he was discovered by Dengar and Manaroo, who recognized him by the tattered armor that still clung to his skinless body. Dengar also found Neelah,and took them both to his hideout in the desert. There, with the help of some of Jabba's medical droids, Dengar nursed Fett back to health.
here is the link to the ecyclopedia :)
http://www1.theforce.net/cuswe/)
Wraith 8