Former prime minister John Howard has lent his star power to the Queensland election campaign, but was not on the campaign trail with LNP party leader Tim Nicholls.

Mr Howard met voters in the Brisbane seat of Mt Ommaney with sitting MP Tarnya Smith, saying Mr Nicholls was too far away.

That was despite Mr Nicholls visiting a fruit market in the Brisbane suburb of Rocklea earlier in the day — less than 15km away.

Mr Howard laughed it was too hard to campaign with Mr Nicholls.

"He's 1,000km away," Mr Howard said.

"What, we've got to be physically walking down the street together to prove that I support him?

"If I'm asked back I'll come and if he happens to be here in town. I'll walk down the street with him. I'll promise you."

Mr Nicholls also visited Charleville in western Queensland, promising $25 million for cluster fencing to protect agricultural land from pests.

John Howard accused Annastacia Palaszczuk of not being consistent with her views of Adani. ( ABC News: Talissa Siganto )

The funding forms part of the LNP's agriculture policy, released on Friday.

Mr Howard praised Mr Nicholls' approach to the campaign.

"You might think I'm slightly biased because I'm a Liberal," he said.

"But he has got off to a very positive start in the campaign.

"He sounds very upbeat but he's not taking anything for granted."

The former PM also criticised Premier Annastacia Palaszczuk for her position on the Adani mine in Central Queensland, claiming the Premier was sending mixed messages.

"The first requirement of effective leadership in politics … is to know what you believe in and where you stand," he said.

"The problem Annastacia Palaszczuk has is that I don't know where she stands on the Adani mine.

"In one part of the state she's for it, in another she's sort of against it and another part of the state right against it.

"That is unimpressive, irrespective of where your politics are."

Labor pledges extra Gold Coast stations

Meanwhile, Labor has announced three new train stations would be built on the Gold Coast by 2023 for $40 million each if the Palaszczuk government is re-elected on November 25.

Construction of the stations at Pimpama, Helensvale North and Merrimac would begin in 2021 as work is also done on Cross River Rail in Brisbane.

A $3 million spend would occur for planning and design to start next year.

Ms Palaszczuk and Transport Minister Jackie Trad have again called on the LNP to say if it would scrap Cross River Rail.

