Dear John,
Good a.m. and may this find you well. Further to a post below, if you use impact tools on the fuel filter fitting, you MUST disconnect the negative battery cable clamp from the terminal.
The reason: to avoid triggering the airbag(s). The SRS (airbag) sensor is just above the fuel filter housing, and if you don't disconnect the negative cable clamp from the battery terminal, the shocks from the impact wrench could trigger the airbag.
While you won't be in harm's way, a replacement airbag will cost about NZ$1,500 (US$1,000).
Yours faithfully,
spook
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