These pumps are made by Shurflo. Almost everyone in the W/M business uses that brand of pump. Some companies like Alkyl Control claim to take them apart and also test them.
As for surging, if you hear it pulsing some that is fine. To me surging is when it would not provide consistent flow. If you have engine on and push button, the engine should react by RPM's dropping. I also created a light that comes on when pump is running. That tells me there is power to the pump, created when boost hits around 8 PSI.
Torrie and I were constantly changing the tunes to improve my ET's. I also was running a 3 bar sensor in the intake manifold. Thus I saw boost pressures as high as 20 psi, for short periods of time, usually at the high end of 2nd gear. I would have to look back thru saved logs, but as I remember, once at boost in a wot run at the strip, that I would see boost always above 14-15 psi. Due to small turbos, it was a bit peaky. The big thing you need to watch when logging is that your Lambda numbers don't go too high. I liked to see them at or below .82 for both banks. Also Fuel Rail Pressure (FRP) is extremely important. I like to keep it above 1,200 psi,. However, when spraying 70% or higher methanol concentrations, the methanol burns and acts as additional fuel, besides cooling the charge, so the real key then is the steady Lambda readings. Any Lambda spike means a lean condition, which is a No...No... when running high boost.
Also, from what I understand, the boost number alone doesn't mean you are maximizing your engine's potential. I'm sure others have lots to say on this so please chime in.
