Food delivery riders, unionists and politicians have rallied in Sydney calling on Foodora to cough up unpaid wages, superannuation and taxes.

The Transport Workers Union this week alleged that as well as owing wages the food delivery company - which has pulled out of Australia - is being pursued by the Australian Tax Office and NSW Revenue.

Dozens of former riders, union members and Labor senator Kristina Keneally gathered outside Prime Minister Scott Morrison's Sydney CBD office on Wednesday to demand action.

"The federal government has refused to back taxpayers and food delivery riders instead choosing to back tech billionaires ripping them off," TWU national secretary Tony Sheldon said in a statement on Wednesday.

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