Fuel problem?

[L8RH8R]

So I installed a new Walbro 255 and nothing changed. The pressure rose just a little. 2 psi or so. I'm lost. The only thing I can think to add might be a hot wire kit. It starts about the same. Several tries before it fires up. While running it is smooth. When I idle it up, the pressure does come up a bit but nothing like the 55-60 psi I've heard about. The fuel filter is new. The fuel pump is wired off the original 1991 relay (red wire). And thoughts would be great.

[gagliano7]

What fuel system are you plumbed for return style or returnless? What kind of regulator are you running? I had my hose come loose on pump in my tank and only had 20 psi and motor still ran fine at idle and part throttle. I wonder if one of your injectors are staying open or one of your coils aren't firing. Is the PCM tuned for the injectors you have? I have the returnless setup with the corvette filter/regulator and I have 58 psi all the time.

[L8RH8R]

It's a return style. All factory, regulator and all. The hose on the fuel pump has a good connection (worm style clamp). The PCM is all stock. The only thing non stock is the shorty headers.