Secret No. 6: Low fuel pressure? It could be something other than the fuel pump.
“I remember a guy in Miami who told me he could change fuel pumps faster than his dealer could,” Hutt recalls. “He’d gone through five in three years.” With Hutt’s assistance, the owner discovered it wasn’t the fuel pumps that were the problem, but a high fuel vacuum that was prematurely wearing them out. Again, keep track of how often items are replaced. Fuel pumps take their unfair share of the blame, but often the problem is a restriction somewhere in the fuel supply line. A new pump might overcome the problem while it’s fresh, making it seem as though it was the right fix, but eventually it will give out from the stress. Ask about the mechanic’s fuel vacuum reading; anything more than 2½ inches of mercury on his gauge is a sign of an obstruction, meaning the pump has to work too hard to pull fuel through the line.