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Old 08-22-2010, 11:02 AM
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Biodiesel300TD Biodiesel300TD is offline
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Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
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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