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Supplier Of Carbon Monoxide Used In Murder-Suicide Makes Changes, Inquest Hears

The companies that sold and delivered carbon monoxide to a Sydney father who used the gas to kill his family made changes following the tragedy, but also concede more can be done.

Fernando Manrique, 44 and his wife Maria Lutz, 43, were about to divorce when they were found dead along with their children Elisa, 11, and Martin, 10, and the family dog Tequila, in their northern Sydney home in October 2016.

They all died from carbon monoxide poisoning.

At the opening of an inquest into their deaths at Lidcombe Coroners Court, counsel assisting Adam Casselden said there was "little cause for doubt" that Manrique was responsible.

He paid a friend $400 to receive a delivery of the deadly gas which, the inquest heard on Tuesday, has only a few specific industrial uses.

The gas was sourced from industrial supplier BOC.

Fernando Manrique and his daughter Elisa. Image: AAP

Following the 2016 deaths, the company removed carbon monoxide from its public website so only approved customers could order it, production manager Robert Brittliff told the inquest on Tuesday.

An "end-user declaration" form also became mandatory for people wishing to purchase the gas from BOC.

But once a customer follows that process the only additional check likely to stop them receiving the gas is if the delivery driver becomes suspicious it wasn't going to be used properly.

Delivery to a house may be a red flag, the inquest heard on Tuesday.

READ MORE: Man Suspected Of Gassing Family In Murder-Suicide Had Teen Girlfriend, Inquest Hears

However, a customer determined to "bluff" their way through the initial declaration form would likely be able to get their hands on the gas even if they faced further questions, Brittliff said.

"I'm concerned if they've already bluffed through that process once, there's not much to stop them bluffing through it again."

Trucking company Linfox says drivers are "empowered" to make decisions when they deliver products to customers.

"Linfox empower drivers to ask questions if they think something does not feel right," executive Simon Livingstone told the inquest.

"To my knowledge, drivers did ask questions in relation to this delivery, which I think is a credit to that process."

Maria Lutz with children Elisa (left) and Martin (right), all found dead along with her husband Fernando Manrique in Davidson in Sydney's north. Photo: AAP.

Livingstone agreed it would be "helpful" for drivers to carry copies of the BOC document to query the customer about their intended use for carbon monoxide.

But he admitted highly technical scientific uses could be confusing or challenging.

Brittliff said delivery drivers' judgement was an important "line of defence" and making customers' licence and declaration form available to them could be helpful.

If you need help in a crisis, call Lifeline on 13 11 14. For further information about depression contact beyondBlue on 1300 22 4636 or talk to your GP, local health professional or someone you trust.