Boris Johnson said he would discuss the “driving habits” of US personnel around a British airbase with US secretary of state Mike Pompeo following the death of Harry Dunn.
During a conference in Berlin on Sunday, the prime minister was asked what progress had been made in getting the suspect Ann Sacoolas extradited to the UK to face trial.
Ms Sacoolas, 42, the wife of a US intelligence official, is believed to have been driving on the wrong side of the road near RAF Croughton in Northamptonshire and was charged with causing death by dangerous driving after Harry’s death.
The PM said: "We're certainly raising all those issues - about the driving habits of US personnel at the base - and we're continuing to work for justice for Harry Dunn and for his family".
RAF Croughton became the focus of an international controversy after Mr Dunn was killed in a head-on collision with a car on August 27 last year.
Ms Sacoolas controversially claimed diplomatic immunity after the incident and fled to her home country - she has since refused to return to face justice despite pleas from Harry’s family.
The US State Department has also said a UK extradition request for Mrs Sacoolas is highly inappropriate and was an abuse of powers.
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Earlier this week Harry’s family accused the prime minister of having “no wish or intention” to meet them to discuss their son’s death.
The 19-year-old’s parents, Charlotte Charles and Tim Dunn, had been hopeful of a meeting with Mr Johnson after they said they had “repeated assurances” from senior members of his cabinet.
Speaking about their hopes of a meeting with the prime minister, Radd Seiger said: “Sadly, it is now clear to the parents of Harry Dunn that, despite repeated assurances to the contrary, prime minister Boris Johnson has no wish to, or intention of, meeting with them.
“For all his multiple faults, even US president Donald Trump took the time and trouble to meet with Harry’s parents and extend his condolences personally, albeit for his own personal gain rather than to help Harry’s parents.
“Trump looked the parents in the eye and told them how sorry he was.”
Mr Seiger continued: “Johnson, on the other hand, has done his level best to steer clear of Harry’s parents and continues to do so.”
Asked whether Mr Johnson would meet the family, a Downing Street spokesman said: “The legal process is ongoing and the UK has submitted the extradition request.
“The prime minister will continue to work to get justice for Harry.”