Just purchased a used 2002 Avalanche with 157,000 . In the morning it took 3 turns of the key before it would start and this condition persisted for 3 days . I figured fuel regulator , Fuel filter or Pump. I dumped 32 ounces of marvels mystery oil in the gas drove for one day and ever since it has started every time . Marvel Story or coincidence ?? I will replace the regulator as it appears corroded but is not leaking, no fuel in the tube and no weird noises from the pump , Is it possible something was sticking on the fuel pump and is now lubricated or cleaned from the marvel ? Or do the pumps wprk and not work before they fail ? Power is good and the idle is smooth .
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