Labour is to try to pressure Chancellor George Osborne into scrapping a 3p rise in fuel duty due to take effect in August.
Shadow chancellor Ed Balls warned that the increase would only worsen the recession squeeze and urged the government to postpone it until at least January.
He said the delay could be funded by closing tax loopholes and using the £500 million underspend from the Olympics budget.
Labour will table an amendment to Budget legislation next week and try to rally cross-party support for the move.
In an article for The Sun, Mr Balls said the 3p increase would "send the wrong signal".
"With Britain now in a double-dip recession, the last thing our economy needs right now is another tax rise adding to the squeeze," he said.
"The government should be giving our economy a boost - not clobbering families, businesses and pensioners just at the wrong time."
He said there were "many ways" to raise the funds, including reversing pension tax relief for people earning more than £150,000 a year.
"David Cameron and George Osborne may have never had to worry about the cost of filling up their car. But it's time they started listening to those who do," he said.