My grandson 12 years old saved and bought a 84 c10 truck.it had a hole in gastank,we fixed it and now it will not stay running.we replaced the fuel pump and new gas lines.could it be the float in the tank we have had this tank off 5 times.it will run out of a gas can .this is really bugging us and upsetting a young man who just lost his mom. please help

I sorry I wasn`t thinking right everything I have worked on lately has had a electric fuel pump, Do this pull fuel line off at the Mechanical fuel pump take a air line and blow the fuel line clean all the way back to the tank have your granboy listen at gas cap position with cap off to see if he can hear the air bubbleing back in to the tank if air is reaching the tank put 15 gallons in it to be sure the fuel pump will pick it up put line back on the pump.Fill the Carberatur float Bowls up taking a 2 liter bottle half full of fuel prime the float bowlsby puting asmall funnel on the float bowl breathing tube in the front of the CARB get the bowls full start it up and keep feed gas through the CARB till the fuel pump is pumping fuel to the engine TRY THAT!? I sorry I wasn`t thinking right everything I have worked on lately has had a electric fuel pump, Do this pull fuel line off at the Mechanical fuel pump take a air line and blow the fuel line clean all the way back to the tank have your granboy listen at gas cap position with cap off to see if he can hear the air bubbleing back in to the tank if air is reaching the tank put 15 gallons in it to be sure the fuel pump will pick it up put line back on the pump.Fill the Carberatur float Bowls up taking a 2 liter bottle half full of fuel prime the float bowlsby puting asmall funnel on the float bowl breathing tube in the front of the CARB get the bowls full start it up and keep feed gas through the CARB till the fuel pump is pumping fuel to the engine TRY THAT!?

Prime fuel line from pump back to the tank if you can!? Prime fuel line from pump back to the tank if you can!?