Deputy Prime Minister John Prescott meanwhile has refused to assure voters that the ruling Labour Party had not given peerages in return for donations and loans.
Fifty-six percent of voters polled by the YouGov organisation for the Sunday Times newspaper said they thought that Mr Blair had given peerages for loans while only 14 percent believed he had not.
The poll was published after a stormy week for Blair in which the financing flap dominated the political headlines amid insinuations of sleaze.
The same poll also put Blair's personal approval rating at 36 percent, its lowest point ever, according to the pollsters.
Peers are members of the House of Lords, the all-appointed upper chamber of the British parliament that plays an influential role in vetting legislation put forward by the government in the elected House of Commons.
When asked on the BBC's Sunday AM television program to give a categorical assurance that honours were not for sale he said: "I think we have got to look a lot more at this before you come to those conclusions you have come to."
Mr Prescott added that he "certainly wasn't happy" about recently learning of the loans from the newspapers.
In another poll, by ICM for the Sunday Telegraph newspaper, seven out of 10 poll respondents said they felt Labour was at least as sleazy as the Conservatives had been when they were trounced by Labour in the 1997 elections.
It remains to be seen how the furore might overshadow Chancellor of the Exchequer Gordon Brown's annual budget address on Wednesday, before Mr Blair attends a two-day EU summit in Brussels.
But it has been enough to rattle grassroots Labour activists who fear it will cost the party votes in local council elections on May 4.
The Labour Party has conceded that it had received 13.95 million pounds in loans from wealthy supporters last year, when Mr Blair steered Labour to a third straight election win.
The loans were made "in full compliance" with political financing rules, which in Britain require donations, but not loans, to be publicly disclosed, a Labour Party spokesman said.