Put new fuel tank in and now when I try to drive it dies but only under power. on 1993 Chevrolet S10 Blazer

driving the truck now has no power and dies out like the fuel pump isnt working properly but in idle runs fine and revs fine and I connected everything back properly

Asked by for the 1993 Chevrolet S10 Blazer
5 answers
Sounds like a lack of fuel pressure. i agree with the above mentioned items. curious why tank was replaced and not fuel filter- could be loose connection, kinked hose or damaged strainer intake on pump.
you might have to drop the tank and check for a kinked hose or a loose connection
Brand new tank, or salvage yard tank?
Why was the tank replaced and did you also replace the fuel pump?
poss line problem kinked while installing tank, double ck