[CarlC]

The Aeromotive Stealth 340 is capable of supporting approximately 900 FWHP naturally aspirated @ 60psi. That's a lot of pump for most applications running at battery voltage.

For most N/A applications running 550hp and below (includes a good safety factor) and running a traditional pumping arrangement the Walbro 255lph (GSS340) is a good economical choice that has much less power demand than the Aeromotive 340.

All pumps however are subject to damage when run dry.

The pressure scenarios you mention are typical of a pump that is on it's last legs. When cool they will run for a short time, then pressure will begin to decrease. The "short time" gets shorter and shorter until complete failure arrives. If you have a fuel pressure gauge it's very apparent. I went through multiple GSS340's before I gave up on the traditional systems.

If you're going to stick with either of these pumps I suggest keeping the tank at least 1/2-full. This allows the pump to be partially submerged at all times and allows for a larger mass of fuel to absorb heat.