The Government was accused of putting electoral advantage ahead of the rights of voters as Commons Leader Harriet Harman ruled out a by-election until after the national poll.
Residents in North West Leicestershire are now likely to be without an MP for five months following the death of Labour's David Taylor on Boxing Day last year.
Ms Harman told MPs she did not believe the "expense" of a by-election was justified "immediately in advance of a general election".
Earlier this week the Electoral Commission called for a review of the rules after voters in Glasgow North East were left without an MP for more than 100 days.
The vote there was held on November 12, 2009, with Labour's Willie Bain winning the seat which had been held by former Commons Speaker Michael Martin. But the commission pointed out that people in the area had been left without an MP for more than four-and-a-half months.
During Commons exchanges on upcoming business, shadow Commons leader Sir George Young called for a debate on the by-election process.
"Given that there is currently a similar delay for voters in North West Leicestershire, isn't it time for the House to consider a mandatory time limit within which by-elections are held so we can avoid the Government placing electoral advantage over the constitutional rights of citizens to be represented in this House?"
Ms Harman replied: "We had the tragic, tragic loss of the Member for North West Leicestershire and I think that bearing in mind we know there is going to be a general election shortly, surely you are not suggesting we go through the expense of a by-election immediately in advance of a general election..."
From the Conservative front bench, Tory deputy chief whip Andrew Robathan nodded his head vigorously.
Ms Harman continued: "Well if you are, I don't agree with you."