AWR-fix: e53 Fuel pump / siphon pump details
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The definitive guide on the fuel supply of the e53. much of which is in most BMW with some significant differences like some sedans don't have an actual sump for the pump though BMW will refer to the zone where the pump is located as the surge tank it's just baffles to keep fuel near the pump during g-forces like turning and braking, however they won't hold the fuel during high angle of attack (pitch).