Guess ur probly right. I did have a problem when I first tried to set the fuel pressure, turned out I had plugged the new, original pick up since it was not being used, " dual pick ups at rear of tank." Much like everything else I do, (over do most things) I plugged the pickup tube inside and out side. And forgot about the inside plug when I used the orig. p/up for a return line. Bout pulled my hair out till I talked to Dave at fast, then it hit me when he told me it sounded like my return was plugged! Thank GOD for smart people!