hi.
I`m looking some good idea how can I increase fuel pressure in returnless fuel system. Stock fuel pressure on idle is 49-53PSI, on fuel load WOT , fuel pressure go down to 43PSI.
I have kpro, and even on 100% duty cycle RC 750CC and 43PSI fuel pressure on warblo 255 fuel pump I have lean a/f ratio when I boost over 15PSI.

I don`t want modify my returnless system to return line.

Somebody know what happend if I install inline fuel pump in retunless fuel system between tank and fuel rail?

Somebody knows how works mugen fuel regualtor for RSX from Kingmotorsports?

thank you any advice.