fuel pumps electric vs mech

[Landlubberatsea]

Here is the link from the good ol' days 
http://www.network54.com/Forum/74182/thread/1085271201/Clay+Smith+FE+Fuel+Pump

[jayb]

2004, no wonder I didn't remember.  The 492" engine was a factory 427 block, and after re-reading the post I do remember doing some of that grinding.  Barry also says that those pumps aren't that great, but at least the one I had kept up with my engine...

[Qikbbstang]

I'm completely lost on this "advice":
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Re:
Hope this helps !
Past msg from Robb
The easiest is to use a low performance mechanical pump to feed our PowerSurge:
http://www.robbmcperformance.com/products/powersurge.html

Your other option is to supply us with a new old stock or rebuilt/remanufactured stock pump from which we can take the arm, upper housing and diaphragm assembly. It must be an Airtex, or AC brand part number 40345
The pump MUST HAVE a 3-5/8" diameter upper housing. All the new pumps that are still available have a smaller diameter housing or a different design and will not work with the RobbMc valve body.
Once you supply us with the correct 40345 pump, we can use it to build a RobbMc 550HP or 1100HP pump for you. The cost will be $175 for the 550HP or $275 for the 1100HP.
Robb
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The easiest is to use a low performance mechanical pump to feed our PowerSurge:
http://www.robbmcperformance.com/products/powersurge.html

              (1) Why/How does one use a mechanical pump to feed an electrical pump??  The link IS to an Electric Pump. 

              (2) The use of a "disposable" AC Pump, arm,  body w/crimped construction to build a power surge pump  ? 
              (3) Power Surge: An easy-to-install electric fuel system for carburetors and fuel injection. What kind of carb uses more than a fraction of the pressure of fuel Inj?  A pump for both F-inj and carb??
             (4) "No need to get under your car: The PowerSurge can be installed in your engine compartment. Connect it to your stock fuel pump, vapor return line and and a bypass regulator. Then connect one wire to switched 12V power and one to ground. That's it. No crawling around under the car to install. Because the electric fuel pump in the PowerSurge is submerged in gasoline, the pump is very quiet and runs very cool. Also, because it is submerged, there is no chance of the pump sucking air into the system during acceleration or cornering. "
                    The pump is submerged in gasoline- but it's installed in engine compartment....??