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I have a Carter mechanical fuel pump for my Nova and it's been sitting in the box for about two years. I put it on and it had 3-4lbs of fuel pressure and after about 10 minutes, it went to zero. Engine still ran at idle and even revved a bit. It didn't shut off, just sat there idling for 20 minutes. I changed the gauge, same problem. I changed the regulator, same problem. Could the diaphram in the pump be bad? I let it sit overnight and started it today and the pressure was up to 4lbs. I adjusted it to 6, that's all I could get, and then it slowly went to zero in about 10 minutes again. I think the pump could be bad. What do you think? Dave