korg_geek

Hi guys, I picked up a 1973 240Z about six months back that i've been personally restoring back to a "tasteful" level. The previous owner was a wonderful japanese fellow who took marvelous care of the machine. The only problem i've had with it since its purchase is what i thought was a carb problem. It has dual 1971 SU's, installed to replace the faulty 73 carbs. They were "professionally tuned" a year ago, which is why i was surprised to notice bad fuel economy, dark, gas-smelling exhaust, some occasional sputters and other tell-tale signs of a rich mixture due to unsynched/misadjusted carbs. So i planned on getting it looked at - until the #1 Zcar pro in the area told me, flat out, that the problem wasn't with the carbs, but the fuel pump. See, the pump was replaced a year ago with a new electric model (replacing an older model i'm assuming was also electric since this is a '73 and all had their pumps replaced). This guy told me, over the phone, without ever seeing my Z, that the pump is running at way too high of a PSI and i just need to slip in a regulator to adjust it down to 2.5. Okay, that sounds awful easy; and the only reason i'm skeptical is that i ALWAYS hear that this situation is a carb problem, not a fuel delivery problem. Does anyone know if lacking a fuel regulator causes a Z to run really rich? This guy's got 30 years of Z experience (from Nissan itself, no less), but I've always heard that regulators were neat add-ons, but not that important to daily performance... anyways, thanks a bunch for reading this! :classic: