I have never had a Bio related issue with our systems... other than filter stopping up.
If fuel sloshes away from the suction tube, you will have a momentary drop or fluctuation in pressure. This mainly happens about 1/4 tank or lower with stop and go driving.
Ok Dan, Thanks! Also, for those that think these things are noisy, Mine is not. When my truck is running, I have to put my head down by the running board to hear it... Also, my truck does idle smoother with the FASS and I like the 3 micron filtration...
Cheers