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When I started running higher % I had to replace my HPFP because it was coding with high pressure fuel rail codes. Then I was maxing trims so I bought the flex kit with flash. Wasn't more than a week as I was turning up the boost and timing, I started getting LPFP codes. I waited for the FFTEC booster pump and haven't had any issue sense I had it installed before shift sector. I'm running 100% e85 and the Ethanol sensor is reading 80+ % on average.
On a side note, my trip home from SoCal, I loaded the pump aggressive maps and with just pump I got 29 mpg with stage III map4 with meth for the few times I had to stand on it in the mountains.
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