DIY_EFI Digest V4 #474

[rpettibo at hpubs.com]

I think the simple answer to this question is  a fuel pump is designed to
pump against head pressure.   In other words push fuel.  Fuel injection
pumps are not engineered to act as a suction type device.  Therefore,
restrictions on the inlet side must be kept to a minimum.  This is why the
pump must always be at or below the fuel supply level to insure the pump
never runs dry.

If the fuel filter begins to restrict the flow of fuel and the pump runs
dry it will fail.