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water and E10 kill fuel pumps and sending units
..."the fuel doesnt usually mess the pump up, it usually gets to the contacts on the fuel sending unit. this does not necessitate a change of the pump."...
no , it is BOTH the fuel pump and the sending units that are destroyed .
BMW and Mercedes Benz will not warranty a fuel pump IF the fuel in the tank has contaminants like water or fuel with more E than E10 .
those fuel pumps have a very hefty price tag
the warranty claim must be submitted with fuel test results or it is denied .
many OEMs demand or at least strongly recommend top tier fuel because of the contamination problem
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