Fuel Pressure Dropping

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For some reason my fuel pressure will slowly drop from 7psi to 3psi. When I start the car up cold, everthing is fine. But let it run for 5 mins, and the pressure will drop off. My car is a 71 Valiant with a stock 360 magnum converted to a carb. Im running an Alum cell with #8 line to the jegs billet filter into a jegs billet pump. From the pump to the reg is #8 line, then split to #6 to the carb. Im not running a return line to the cell. The fuel line does run about 3 inch at the exhaust at one point. But I can put my hand on it when the car is running. So I dont this it is getting the line hot. Any ideas.

Thanks, Bill

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Check the voltage at the pump when this is occurring

Quote:

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For some reason my fuel pressure will slowly drop from 7psi to 3psi. When I start the car up cold, everthing is fine. But let it run for 5 mins, and the pressure will drop off. My car is a 71 Valiant with a stock 360 magnum converted to a carb. Im running an Alum cell with #8 line to the jegs billet filter into a jegs billet pump. From the pump to the reg is #8 line, then split to #6 to the carb. Im not running a return line to the cell. The fuel line does run about 3 inch at the exhaust at one point. But I can put my hand on it when the car is running. So I dont this it is getting the line hot. Any ideas.

Thanks, Bill

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I have the same problem but on the nos side of the fuel system off the y block (I have not sprayed it yet)