I've got a problem with too high fuel pressure on my 57 wagon....I have 11 lbs pressure at idle and 16 lbs at a fast idle (1500-2000 rpms).I've replace the mechanical pump twice and put the third pressure regulator on it. I can set the pressure at 4.5-6 lbs. and it will hold there for a day or so then back to the high pressure.. The pump is for a '69 chevy 350, which is the engine in the car...The pressure gets so high that gas will come out of the vent on carb and pour into engine. Before the regulator goes bad it will start leaking...Any ideas from anyone ??????