I am having the same problem gentlemen. I have a 1971 Datsun 240Z with what appears to be a 73' or 74' SU Carb system. The previous owner rigged an electric fuel pump and I can hear the pump working when the ignition key is turned. I pull the hose off of the carburetor and I could feel a bit of pressure but I doesn't seem to be pumping enough to keep the car running. I am going to purchase another electric pump tomorrow and see if that does the trick! I also am going to try replacing the carroded wires and cracked hoses that make up the fuel delivery system. I bought the car at 12:30 PM and after hauling it on the back of a trailer for about 120 miles. The car would not stay running. I concluded the starter works, the air filter is not clogged nor the air lines, and the battery is good. I the last thing I noticed are the fuel lines are bone dry. Is there a way to put fuel in the lines other than the pump to make sure that it is the fuel pump that is broken? Or am I better of spending the money on an electric pump?
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