[Formulajones]

Originally Posted by rohrt

This topic gets brought up a lot but the one thing I have not understood is it's really a flow issue or a suction issue. For me my car would sputter out pulling in 2nd gear with a stock pump and Q-jet. With the acceleration pulling everything back how do you know which one it is.
Does the RobbMc pumps or the carter pump do any better job of this over stock?

I wonder if a vacuum gauge could be put on the input line and be measured.

To even get a stock pump to work well at the track for me, I have to do a lot of trickery to the fuel system for a good supply of fuel to help those stock pumps along, but even that only gets me mid 12's at 108-ish mph before I start to see signs of problems. I've done it with Q-jets. More power shows signs of weakness though in the fuel system.

On one car here, temporarily solved that installing a Holley mechanical pump with more GPH. So that was a solution at the time (1980's). The RobbMC is also a way to do that and in my opinion, I like those pumps better if you absolutely want a mechanical.