fuel pump problems

[bradley]

I just got done putting the engine in my 90 and I have a fuel pump problem . turn the key sometimes I get pressure and sometimes I don't . I have replace the top fuel pump and the same thing . I used the red wire to test the pumps and they come on . I also have cked the 10 amp fuse on the drivers side and it looks good .. I am stumped .I am in the middle of moving and cant find my factory service manual . help please ....