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How long had it been since your last fuel filter change?
I would think that is the reason for the build-up. You should be changing it at the maximum of every 30k miles.
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HIS: '07 Mazda CX-7 Touring...20% tint all around
HERS: '06 Mazda 3s...tint/CAI/Mazda3 pedals
GONE: '99 Maxima...i/h/e/eibachs/b&m/17s
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