13BeastREW
Automotive
- Oct 5, 2004
- 8
In a perfect world a certain in-tank fuel pump will flow 200 liter/hour and read 40 PSI on pressure gauge connected to the outlet of the pump.
Now for 2 scenarios...
The fuel tank is nearly empty and not moving, there's only enough fuel in the tank to cover the inlet of the fuel pump. Assuming the change in fuel pressure from the inlet to the outlet was instant, at that moment would the fuel pressure still be 40 PSI or would it start to drop off.
Second scenario... A fuel pump running at full speed in a fuel tank with no fuel in it, only air at atmospheric 15 PSI (which the pressure guage ignores), will the pressure gauge reading be zero or a number greater than zero.
Now for 2 scenarios...
The fuel tank is nearly empty and not moving, there's only enough fuel in the tank to cover the inlet of the fuel pump. Assuming the change in fuel pressure from the inlet to the outlet was instant, at that moment would the fuel pressure still be 40 PSI or would it start to drop off.
Second scenario... A fuel pump running at full speed in a fuel tank with no fuel in it, only air at atmospheric 15 PSI (which the pressure guage ignores), will the pressure gauge reading be zero or a number greater than zero.