Actually, the flat side should be facing back towards the fuel tank, but as long as you pointed the arrow towards the front it should be ok. I don't think you can reverse it anyway, but I've heard of people who have, so I have to ask.
The code is for the fuel sensor. That's an expensive part. I'd double check the fuel flow arrow on that filter.
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Originally Posted by the user formerly known as ZX3_Chick
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