I have a Walbro 255 from fwdp with less than 8k miles on it and I am wondering if I got a bad pump? If I clamp the return line it will only give me a max fuel pressure of 58psi? I thought that it should pretty much peg my 100psi gauge, but that does not seem to be the case. Do I have a bad pump? I have +40's if that matters at all.