and i still didnt see any issues noted for that matter lol
I'm not sure what you mean here. IF he's got a low pressure (60psi max) pump and he's running 40psi base pressure and trying to run over 20psi, he'll exceed the max fuel pressure rating of the pump.
I thought he meant that there was some kind of problem he already ran into, IE, fuel pressure drop, whatever, he didnt specifically mention. New tanks are QUITE expensive, and i was just hinting to the fact that if the OP did in fact have a real walbro and it was a GSL392, than it was HP, and that pump was plenty of pump for 20 #'s, thats all. I dont know it all either, i just knew that that particular pump was pushing plenty of high boost cars. If the Pump is not in fact a real walbro, (obviously a common problem) than its a moot point.
i see, that wasnt mentioned. something i would check, i know the in line pumps are particularly picky when it comes to being properly filtered pre-pump, and (obviously) can be VERY picky about needing to be at the lowest possible location, as they function much better pushing than trying to pull. They have a tendency to get real hot and burn up if under strain. Just my two cents