Does the weight of petrol in your tank help Pump to work better by pushing against/through pump so the Pump not having to pump so hard the Petrol?

  • The pump wont notice the difference, its negligible. – Moab Apr 20 at 14:51
  • 2
    The best way to achieve pump lifespan is to keep the tank at least half full. It's an electric pump that's cooled by the fuel. When you run low on fuel, you overheat the pump. The weight of the fuel on the pump is negligible. – user9181 Apr 20 at 15:25
  • @Moab some pumps will fail to "pull" fuel if the pipes run dry... – Solar Mike Apr 20 at 15:25
  • Only the cheap inefficient ones, haven't seen that issue in many years. – Moab Apr 20 at 16:23
  • In the old days of mechanical pumps putting out a few psi to the carburetor , the fuel level made a difference. Today with high pressure injectors it makes no significant difference. – blacksmith37 Apr 20 at 16:38

Only possible if the tank is above the pump, if not, then the pump has to work to get the fuel - terms like positive head and suction head are used.

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