THE United Firefighters Union has urged its members to boycott the Victorian Government's CFA inquiry.

In a bulletin issued last month UFU secretary Peter Marshall stated: "Members are strongly advised that until further direction from the (union's) executive, members should not participate or provide comment at this stage".

Former County Court Judge David Jones is leading Victoria's first inquiry into CFA resourcing and management of its 58,000 volunteers.

A crucial part of the inquiry is the impact of CFA deals with the union, which volunteers say gave the UFU's 552 career firefighters an unfair say in CFA management decisions and volunteers' access to training, protective clothing and resourcing.

The 2010 deals, overseen by former Premier John Brumby's office, forced the CFA to employ an extra 342 career firefighters within four years and gave the union the right to veto the CFA chief officer's decisions.

In its April 29 bulletin the UFU stated it had not yet made a decision as to whether it should participate or not in the inquiry, but in the meantime advised members against it.

The bulletin stated the union was seeking legal advice to ensure its members were "protected from any potential adverse or unsubstantiated findings as a result of submissions from persons who participate".

The Union refused to answer questions on whether it had lifted the boycott since it was issued at the end of last month.

"The UFU has no comment in relation to the above matter," UFU industrial officer Greg Pargeter said last Friday.

The inquiry held its last public meeting in Sale last Thursday and submissions closed on Monday.

Victorian Emergency Services Minister Peter Ryan said he was "disappointed at the approach the UFU has taken".

"The inquiry would clearly benefit from open communication from all stakeholders."

Mr Jones was unable to comment on the issue.

Volunteer Fire Brigades Victoria chief executive Andrew Ford said the inquiry would have benefits for all firefighters.

"We've had positive reports back from our members who say Judge Jones has been open, listened and understood their concerns," Mr Ford said.