Need help with fuel problem....kinda long

Hey guys im having some sort of fuel issue and i need some ideas on whats going on.7 years ago i built a new motor for my Coronet...30 over 440,10:1 Eddy heads 292 purple shaft 750 dp,torker intake,727 reverse manual valve body,3:23 gear, Mopar electronic ignition. I ran the car and it ran 12.38 falling on its face coming out of first gear. Never had time to figure out the problem.Never ran the car again. Fast forward 7 years ( after starting a family). I decided i want to go racing again. Same combo as before accept now it has a Firecore distributor,wires and coil,and an MSD 6al and a quick fuels technology 850 dp. This car has a Carter mechanical pump.
Anyway i made some runs today and it ran a pathetic 13.84 falling on its face right after shifting into 3rd gear. So i bumped my timing up and then it ran worse with a 14 something and after i hit 3rd gear everything just goes away. Ive got the pedal burried and its like sombody shuts the fuel off,. but if i ease back into it it comes back. It obviously seems to be running out of gas but is there something else i may be missing? I was told my carter pump isnt up to snuff and i should add an electric one to help.
So does it sound like that what the problem is to you guys? Ive never run an electric pump and i really would rather not but if it will fix the problem i will. So what do you guys think?.Joe

sounds like it's running out of fuel to me. too bad u don't have a fuel pressure guage to monitor the pressure on a pass. i run a mallory 140 pump with regulator. #10 line from fuel sump to regulator. car runs 9.60"s & is street driven. no fuel problems here. stay safe, seeya.

Several things come to mind, all of them fuel supply related. Which Carter fuel pump are you you using, stock off the shelf or Hi Po and if Hi po which one part number and if you know is it a two valve or three valve race pump and how old is it?)? Second thing is a plugged up fuel filter or a plug up fuel pick up in the gas tank Maybe a restricted fuel line, like a kink or ? Lots of fuel delivery gremlins out there The hard part or the fun part is figuring out what is causing the problem or problems Are you using all of the stock feul lines and the stock pick up in the tank? If so drain the tank and remove the fuel pickup and look at it very closely for pin holes inside the tank and make sure the line is not plugged up with anything, change the sock and filter also. Make sure that the fuel line is not plugged up either by blowing through it from back to front or vise a versa, once all of the fuel is blown out it should be very easy to blow through it I disconnect the fuel line to the pump and hook up a new piece of flexable fuel line and tighten it down so I can blow through it standing up so no fuel gest into my mouth or on my clothes, saftey first I have seen stock pickups plugged up completely and still start and run, now very well at WOT though You need to know that the motor uses the most fuel in high gear, not in 1st or 2nd gear

yes i have considered that the sock in the pickup may be plugged. & years ago when i built the motor i bought all new 3/8 factory line and a new pickup. I know figuring it out is gonna be a pain in the butt........joe

Thats it guys? Nobody else has an idea whats going on?

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Thats it guys? Nobody else has an idea whats going on?

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You are running out of fuel. What else is there to figure out? I've had several of those mechanical pumps and never had any luck with them. Go electric, it's the only way to fly.