For modern electronic fuel injection, Tim, pressure does matter, very much so. Very high fuel pressure is needed, typically in a range of 30 to 50 pounds per square inch. Flow still must be good, but is not as important as a carburetor system.
Reason for this is fuel flows through a very tiny hole in an injector, a tiny hole like in a carburetor fuel jet, but even smaller.
Pressure must be high to "vaporize" the fuel upon leaving an injector. This is vapor versus liquid. Fuel injection requires a "mist" of fuel, a carburetor simply needs a liquid flow just like the toilet in your home.
Fuel injection units are designed to handle this type of high pressure, and must have high pressure. Pump this type of high pressure into a carburetor, it will explode sending your air cleaner punching through your hood then flying clean over the moon and will circle the Earth several times before coming down.
Only use I find for high pressure fuel pumps is building fuel injected exhaust flame throwers. My girl loves her flame throwers on her Corvette, gives her a feeling of great power over the boys at car shows.
Cops sure don't like flame throwers on cars; frustrates a cop to figure out what type of ticket to write for flame throwers, "Your honor, her car was spitting out flames. Don't know what violation this is, but this has to be a violation of some law."
A gas tank which has a fuel pump inside will almost always be a high pressure fuel pump. This is why I jumped on this pump in the tank thing for installing a second fuel tank. This is a sure bet of launching a carburetor air filter, if not over the moon then right on out to Mars.
Carburetor: low pressure high volume pump.
Fuel Injection: high pressure low volume pump.
Billyray, waiting for his air cleaner to return from space...
