Fuel Delivery issues

[85MustGT]

Just pulled out the gas tank. Yanked the sending/pickup/unit. Everything looks good. The filter on the end of the pickup is brown and looks OK, is it suppossed to be brown? There doesn't appear to be junk in the tank as I expected.

My car runs out of gas intermitently. It runs for great for about the first 10 or 15 minutes then stalls. I paid to have an electrician check it out, at first I thought it was electrical. I put a glass fuel filter on and everytime it stalls the filter is bone dry. Otherwise it is 75% filled with gas.

I replaced the fuel pump and gas filter. I have 6.5 psi. I have a new Holley 80457S. (it had this problem with the old carb as well)

What next? Why is my car running out of gas? I will replace all of the hoses, If the gas line on top of the tank had a small crack could the fuel pump been pumping air rather than gas?

I was thinking of buying an electric fuel pump, mounting it low and near the tank so it pushes rather than sucks.

Any advice?

1985 Mustang GT
5speed
8.8 rear with 3:55s
Holley 600