An SNP move to scrap the 3p rise in fuel duty planned for August has received widespread Westminster backing.
So far 28 MPs have agreed to support a proposed clause, drafted by the SNP, which would amend the Budget and cancel the rise in fuel duty.
The campaign, which is backed by FairFuelUK, is being led by the SNP.
The party said that the clause will be tabled at the earliest opportunity, when the Finance Bill has completed its committee stage, expected in late June.
The SNP's Treasury spokesperson Stewart Hosie MP, who is leading the campaign in Parliament, said: "The level of cross-party support for this clause is astonishing - and reflects the mood across the country that fuel prices must be brought under control."
He added: "The lack of action on fuel prices was one of the biggest issues missing in the Chancellor's Budget. High costs of fuel aren't just hurting the pockets of hard-pressed householders across the UK, they are hammering businesses and hampering economic recovery.
"In the long term a fuel duty regulator would help protect from volatile fuel prices - but in the short term we can take immediate action by scrapping the further 3p rise.
"We already have the highest rates of taxes on petrol and diesel in Europe - it's time to end this highway robbery and call a halt to further rises which will hamper economic recovery."
The MPs backing the clause come from nine political parties with one independent.
Quentin Willson, national spokesman for FairFuelUK said: "Now's the time to show that Parliament really can join together and stand up for the greater good.
"The cost of fuel is one of this country's most pressing social issues.
"We're calling on all MPs to show the hard-working people and businesses of Britain that they understand and care about this vital issue."
A Treasury spokeswoman said: "The Government has taken real action to help households with the cost of motoring, delivering support worth more than £4bn.
"At the autumn statement we froze fuel duty until August and scrapped another planned rise altogether. This came after our decision to cut fuel duty at Budget 2011, abolish the fuel duty escalator and replace it with a fair fuel stabiliser.
"Petrol and diesel will be an average of 10p per litre cheaper than if we had proceeded with the escalator previously announced in 2009.
"But we have always been clear that decisions on the public finances must support the Government's priority of reducing the deficit in a sustainable way."
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