For me it would depend on the race car..... I'm going to make a couple of assumptions here again.


Something with a reasonably small motor (400 CI or less) not turning excessively high RPMs (under 6000) normally aspirated non-NOS engine could probably get by with a good HV mechanical pump. (In my early years I dragged raced cars with the stock or HP pumps (when I could find them) with no problem). From a safety standpoint I like the idea that when the engine is not running the pump is not working and that you have less pressurized fuel line on the car.

In those instances where the engine has a high demand for fuel and it is questionable that the stock type pump would keep up (especially NOS equipted cars that can melt pistons if they lean out) I would go with a positive displacement rotary type pump. This also hold true on engines that see very high RPM as the fuel pump arm can go into a float condition and not keep up with the fuel pump eccentric.

Anytime that a fuel system is changed, safety considerations become paramount. Most sanctioning bodys have very specific rules on fuel systems to include kill switches and the total amount of rubber fuel line that can be in the system. These are an excellent (and if you race) mandatory guide on what you can and can't do.