Fuel pump DELPHI or Bosch

installed a delphi, the 5.3 starts on 1st crank everytime now.

It was indeed my fuel pump, I tried changing the filter first and replacing some dry rotted evap hoses but that only gave me better gas milage. After pulling the old fuel pump the filter that was attached to it was filled to the brim and the pump housing had trash all over the bottom. I likely could've cleaned it out and replaced the filter but id already purchased a new one and figured I might as well swap them. I used the Delphi pump from autozone, and it was much easier than expecting after watching a few youtube videos on it. now I've gotta do it all again anyway because I installed the floater wrong and my gas needle is stuck, oh well thats what I get for rushing to do it before work.

Too many fuel pumps die because of people upgrading the pump with has more amperage but they don't upgrade the fuel pump wires to handle that extra heat. Your setup still seems pretty mild so maybe you don't need to replace your wires but can just run a Bosch 044 like everyone else (including me) has tested tried and true with 660cc Siemens injectors.

I wound up completely rebuilding everything but the long block and transmission. I would recommend fuel pump (Delphi is the best option)

It was a Bosch OEM pump in a Bosch box so I think it should be okay.

I bought an even cheaper one for $99 on amazon, it’s a Delphi which is a well know brand in the GM world. So far it hasn’t failed me.

It needs a fuel pump. It probably has a new one but the Delphi pumps are notorious for screwing up after like a month and causing multiple attempts to start before the kick in. However, they're also super easy to replace.

I personally run in-tank Delphi fuel pumps, one in each tank.

Mine was broken delivered and I had to remove it again. Only found out once I tried starting the engine…

I let them replace the pump with a Delphi unit I ordered from Partsgeek. They couldn't get it started because the security light was flashing. They left and after leaving the car to sit for half an hour it started right up. Immediately ran rough. Kinda worse than before, still feels fuel starved.