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Hey LT, That presumes any "bad stuff" is heavier than the fuel it's mixed with. The problem I can see with raising the pickup off the bottom that much would be cavitation (sucking air) when you've still got a good bit of fuel left in the tank (especially when the truck is at a bad angle - or...

OK - here's another "out of the box" thought: Could it be that the in-tank fuel-pump is not getting full voltage? If it's not, it could give pressure at low-flow rates, but not be able to keep up at high-flow (especially with thicker fuel - WMO) and allow the IP to suck air (from somewhere?). If...

Another possible restriction could be any of the rubber-fuel-lines themselves. You might have gotten some nasty chemical mixed in the WMO that caused one (or more) hose to begin to swell or delaminate (think small flakes or flaps) from the inside - thus blocking fuel-flow and/or introducing...