A former Canberra Liberals president is taking action against the party in the ACT Civil and Administrative Tribunal.

Gary Kent led a push earlier this year to overturn the party's federal preselection in which former ACT opposition leader Zed Seselja beat sitting Senator Gary Humphries for the top spot on the Liberals' Senate ticket.

Some party members were angry about how the preselection was handled and claimed they were unfairly denied the right to vote.

But a motion to overturn the result at a party meeting in March failed.

Mr Kent has been seeking documents about the controversial process and the Canberra Liberals' financial situation.

But he says he has been repeatedly denied access by senior members.

Mr Kent says he wrote to ACAT on Wednesday asking the tribunal to order the Liberals to hand over the paperwork.

"The preselection was a massive fraud on the ACT Liberal Party members. I feel it is important ... to make sure this never happens again," he said.

"We've never been able to see the papers for the preselection, and they will show that there was a degree of cheating involved that was simply unacceptable."

Canberra Liberals president Tio Faulkner says Mr Kent's claims are false.

He says Mr Kent has been given many opportunities, including special meetings, to access documents and he has either failed to attend or walked out.

Mr Faulkner says the action in ACAT can only be seen as deliberately damaging the interests of the party.

Mr Kent rejects that, saying he has no alternative.

"The right to access party documents is provided for in an act of the Assembly parliament," he said.

"I have been trying for a year to see some of the documents and the party has simply refused.

"The right to appeal to ACAT is enshrined in the legislation.

"I was hoping the party would make a very early decision to grant access. It's not my fault they've chosen to take this line of pretending that I've had access before."

Mr Kent says he fears he will be expelled from the party for taking action.

"I was brought up to do what you think is right," he said.