yesterday i swapped out the fuel sending unit on my 98 cobra gas tank everything fired up good finally got 2 see how much gas i had in my tank. this morning left to go 2 work and i started to lose pressure to the point were the car died . i changed the filter cleaned the pump and strainers real good and still lost pressure. got a pressure tester from autozone and was getting 20 or less pressure and nothing when i turn the key to on. i swapped out the pump for another i had got about 30 while in idle maybe 4 with the key on. i think its my regular thats malfuctioning but not sure i dont know wat i can do or how to trouble shoot it...