G'day....That's awesome..SORT OF...Dodgey fuel pump most likely..
I have an AU ll...Love the old girl to bits..not a ute though .. the sedan..
The fuel pumps are a bit of a job to get to on the utes compared to the sedan but aren't too expensive..Just thought I'd post this .. Admittedly it's for the BA but may or may not help with the job
https://www.youtube.com/watch?v=9OALQYeaTZM .. With mine if/when it goes west in the AU and BA and onwards in the cars , it's accessible by removing the rear seat. If you watch this vid you'll be amazed by how much crap is in the tank and how clogged the fine filters are on the pump...Kind of scary ...Cheers Rod..