I have a 350 Chevrolet engine in a 1960 Biscayne.

It has a 600cfm Edelbrock carb with an electric choke and a mechanical fuel pump.

Recently, the car would not start, so I replaced the mechanical fuel pump as I could see via the clear fuel filter that the carb was not receiving fuel.

After replacing the fuel pump I started the car - it was popping. missing, hissing and back firing.

After a few "let it rest and try again's" I restarted the car -- it idled and ran beautifully - I did notice the fuel filter was full of fuel and drawing hard.....

Then, while running beautifully, all of a sudden the car began to pop. miss and back fire again. I immediately looked at the fuel filter and found that the filter showed very little fuel -- it was obvious the engine was lfuel deprived...

The new fuel pump is an 80gph unit, is it possible the new fuel pump is bad?

Or should I look for something else?

Thanks for your advice....