A recently podcast puzzler is about a fuel injected Volvo that won’t run well if the fuel level in the tank is below 1/2 full. This Volvo is configured with two fuel pumps, a low pressure feeder pump mounted in the tank, and a high pressure pump mounted between the tank and the fuel injection rail. I got to wondering why Volvo engineers would configure the fuel system that way? Seems unnecessarily complicated. Why not just put one high pressure pump in the tank as is done w/most modern vehicles, and completely eliminate the need for a feeder pump?
Here’s the puzzler link