New fuel pump worked now dosen't 95 accliam

Have you tested plugs for spark? Could be coil(s)

What make , model and year vehicle ? It makes a difference . It does start but stops running right away ? Before replacing the pump and regulator did you do a fuel pressure test ? Hooking up a fuel pressure gauge ? Or just guessing that was the problem ? And did your test the electrical circuit of the fuel pump ?

when dies check and feel the fuel pump relay if hot --replace with a same number relay from board to test or plug in a new one --and start --or check pump new doesnt mean free from defects it may be drawing excess amps and causing he relay to pop or pump to shut down

is there any check engine light on?

Check your lines, specifically where your filter housing goes into the fuel tank. I had the same issue and I just had to replace that filter along with a hose. It seems the line somehow got clogged. I hope you find this helpful.

I've actually had this happen to me more than once, with different pumps. Quite honestly, the first time it happened, I gave up and bought a new pump. The new pump I got was an Airtex, which out of the box, it worked whenever it wanted to, and this time, I found out why. The main electrical connector, on top of the pump, if it was "bumped" or "moved" a certain way, it would cut off all power to the pump. Weird, I know. Needless to say, that pump got returned, went with a different brand, and never had that problem again.

check for faulty ground circuits . bad grounds can cause an overheating problem in the relays and other components.

might be a bad fuel regulator.. or your fuel pump relay might be going bad.. and also where did u get your fuel pump from.. i ran into a problem where i had to replace a fuel pump 3 times before i finally got on that worked right..

I dont think you have a fuel pump problem, It sounds to me like you have an alternator problem. You see when your alternator quits working the car will run on your battery juice untill it is out of juice and all electrical will go out when you put a new battery on it it will start working again untill the new battery is out of juice or untill the alternator is replaced. If the vehicle wont run then the fuel pump might have went bad too. I hope that helps you out.