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But getting back to my point 3 and 4, if in fact our motor fuels and/or fuel additives are causing the problem, why isn’t the problem the same across the board and include all makes and models, foreign and domestically manufactured cars. We know that isn’t the case. I find it very hard to believe that chemists haven’t cracked the problem of making synthetic fuel pump seals, gaskets, etc., that can resist the affects of fuel additives including ethanol.
Not many vehicles on the road using direct injection. It is becoming more common but not the norm. If not a seal/gasket failure perhaps the ethanol under certian stituations can cause the pump to cavitate and over heat. Alcohol is lighter than gasoline perhaps there is a perfect storm situation that contributes. The symptom of "loud in tank pump" could be cavitation? A high pressure pump running dry can burn out very fast. If it's not a manufacturing defect the only thing it could be is voltage supplied by the car or the fuel flowing through it.
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