Liberal MP Murray Cowper has fired back at emergency minister Joe Francis' claims he should've brought pizzas for the exhausted firefighters battling a blaze in the South West instead of ringing triple-0.

WAtoday became aware on Tuesday of reports food had been scarce for some volunteers, who had travelled to tackle the large fire that threatened the tiny town of Uduc.

"DFES. Your [sic] a disgrace. I've just heard. From a volly, himself. That some of them havent [sic] been fed 2 nights in a row. How was YOUR T-bone," one Facebook post read.

Mr Cowper told Radio 6PR on Wednesday morning he only rang triple-0 as a last resort because the volunteer firefighters were fatigued and needed support.