Can any please list the couses of crank with no start...have this 91 TPI bird that drive me crazy ,New sparks new fuel pump and still ..

 

Do you have spark, fuel pressure is ? Injector pulse ?

 

 

Do you have spark? fuel pressure is? Injector pulse?

 

 

can you hear the fuel pump when you turn the key?

 

Yes , it gives a sound for like 3 seconds than sound goes off .

 

How do you know for sure you have spark?
If these cars are like the trucks, then the oil pressure sensor must read a good pressure otherwise it wont power the fuel pump after the prime when you try to start. Are you sure you are full on oil?

 

Oil is OK.

 

I suspect that the fuel pump is not the right one , parts shop gives me this 305 1991 caprice classic saying all are the same , maybe the pressure is not enough.. with note that after it fire up very well , than second day it wont again.

 

A 91 caprice with a 305 was a TBI, so your TPI would be getting max 15 psi.
From what I have read here, a TPI needs around 30 to at least idle, and 40-45 to be able to drive properly. The unit I put on my truck came set at 45. I havent yet measured the car but I would assume its around the same.

 

SOLVED , poor previous fuel pump has reassemble again , and WALLA car starts. thank you all you were so helpful.