What do you mean by secondary pump? There is only 1 electrical fuel pump, If you mean suction jet pumps in the tank they don't fail because there is nothing to fail, no moving parts no electrical parts.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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