2001 lexus gs300 I just replaced the fuel pump because it didnt work. Now my car wont start at all. It cranks and the new fuel pump pushes fuel but wont start. Not sure what to do and nobody in my area will touch it...

 

Not to over simplify things, but an engine needs three things to run. Fuel, Air, Spark. If you are sure the pump is supplying fuel to the fuel injectors, and you're still alive, you have fuel and air. That said, a handful of issues can cause a no-start condition.

Did it run at all before you changed the fuel pump? Are you sure the fuel pump was an issue? Have you verified spark? Checked fuel pressure under the hood?

You're going to have to start from scratch. All fuses, in all locations check OK? Checked for codes from the OPD port?

 

I disconnected the fuel rail right by the front driver tire and tried cranking it while my boss was underneath and the fuel shot out just fine.

 

The fuel pump assembly on this car is very picky about O-rings / rubber cushion installed inside. For electric pump and pressure regulator.
There is a high chance that one or more of them will be pinched, twisted or go awry during the assembly.
And those brittle plastic housing clips to hold the top and bottom parts tight together also plays important role.
You will then see fuel coming out of it and entering the fuel rail from the engine side, but the line pressure is lower than it should be (44-50 psi at idle).
Unfortunately, Toyota did not fit a measuring nipple to the fuel rail on this car. Instead, repair manual asked to insert Y-adapter into the engine fuel inlet hose and use a pressure gauge to measure fuel pressure.

I witnessed this problem on one of my friends GS300 after replacing the fuel filter in the fuel pump assembly.
Everything goes on - sparks, air, fuel, but the car won't start.
Subsequent reworking of the fuel pump assembly with all new replacements and careful alignment / double checking of all O-rings / rubber cushion fixed the problem.