It doesn't matter. The primary filter isn't hard to refill with fuel with a couple pumps of the primer pump. And has minimal air in it when you put in the new one. The troublesome filter is the secondary(spin-on) filter. It contains a lot more air if you don't fill it with fuel. I usually replace the primary filter first, but that's just order I go in. There really isn't a rhyme or reason for it.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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