Federal Liberals face a wipe-out at the next election as West Australians turn savagely against the Turnbull Government’s failure to deliver a better GST deal.

An exclusive ReachTEL poll commissioned by The Weekend West reveals nine out of 10 West Australians are demanding Malcolm Turnbull fix the system to ensure WA gets bigger share of the revenue raised in the State by the tax.

The devastating poll comes as WA’s most senior Federal Liberal, deputy leader Julie Bishop, conceded the broken GST system needed to be repaired.

As Liberals lick their wounds after Colin Barnett’s landslide State election loss, the poll shows the Turnbull Government is also being punished, with Labor ahead 53 per cent to 47 per cent on two-party preferred vote.

Play Video WA is expected to get only 38.8 cents for every dollar raised. The West Australian Video WA is expected to get only 38.8 cents for every dollar raised.

That is a 7.6 per cent two-party swing against the Government since July’s Federal election and if repeated uniformly at the next election, would snuff out the careers of five Liberals including rising star Christian Porter.

Mr Porter, the Social Services Minister, has only a 3.6 per cent margin in his rapidly urbanising seat of Pearce, north of Perth, which has been hard hit by the mining downturn.

Labor would also claim the scalps of fellow ministers Ken Wyatt (Hasluck, 2.1 per cent) and Michael Keenan (Stirling, 6.1 per cent). High-profile backbencher Andrew Hastie (Canning, 6.8 per cent) and veteran MP Steve Irons (Swan, 3.6 per cent) would also lose their seats.

An electoral massacre of that size would reduce the Liberals to six seats and see Labor double the number of its MPs to 10.

The ReachTEL survey of 1500 West Australians on Thursday night shows the Federal Liberals’ primary vote has plummeted from 45.7 per cent at last year’s election to 37.5 per cent.

Play Video Liza Harvey will not lead the Liberals, saying she will support Mike Nahan to become party's leader The West Australian Video Liza Harvey will not lead the Liberals, saying she will support Mike Nahan to become party's leader

Labor has enjoyed only a small benefit from this collapse in support, with its primary vote edging by just over 2 percentage points to 34.6 per cent. One Nation is attracting 5.1 per cent of the vote, an improvement on the 4 per cent of the Senate vote it captured at the Federal election, although the party’s disastrous last week of the State election campaign may have dragged down its support.

A major stumbling block to the Government’s recovery is the failure to immediately fix WA’s GST injustice. More than 92 per cent of those polled want Mr Turnbull take action so that WA got a bigger share of GST, including three-quarters who said it was “very important”.

In a worrying sign of the anger at the Government, more than a third of those surveyed — 36 per cent — indicated they would be less likely to vote for the coalition if Mr Turnbull did not change the GST system by the next election.

Voters marked down both Mr Turnbull and Bill Shorten on their performances. Just 29.3 per cent rated Mr Turnbull as doing a good or very good job, while 27.7 per cent of voters praised Mr Shorten.

Mr Turnbull is considered a better prime minister than Mr Shorten, 54.5 per cent to 45.5 per cent.