Cranks will not start

1995 Nissan Sentra 4 cyl Front Wheel Drive Manual

ok so here it is, I was in the del taco drive through and I felt a kind of bump, almost like a misfire but not, when I went to pull up it shut off. The next day I got a fuel pressure tester and it showed when I turned the key it was at 45 psi then slowly started to drop to about 10 or 15. I installed a new fuel pump and it still wont start. I pulled the plugs and they are black soot colored. Now im thinking its the fuel pressure regulator. Battery is fully charged and it turn over a ton but it just wont fiire. Any ideas?

95 Sentra Won't Start- batt. Terminals are clean, jumping the car off didn't work - no clicking during the start. Potential problem?

Engine Mechanical problem
1995 Nissan Sentra 4 cyl Front Wheel Drive Automatic

I have a 95 nissan sentra gle and one day the car was running fine then the next day it would not start so I check everything fuel, spark, etc but nothing was wrong so I then checked the compreesion which was at zero so I went and bought another engine and installed it but now im at the same problem but of course this one has very good compression in the cyclinders the fuel line and good spark, good plugs good wires new air filter oil changed with premium 5w 30 so I dont know what to do.

Ok I have a update I started playing with the fuses for my fuel pump and I noticed that when I took the fuel pump fuse out the car would actually start but then shut off shortly after then I would put it back in and try to start the car but it wouldnt start so I kept pulling it out and it would start then putting it in and it wouldnt after about 15 times of doing this finally the car started with the fuse in and it stayed on and I can turn it off and back on without any problems now but my concern now is the engine I put in has a light tap/knock every now and then and when the engine is raised to approx 4000 rpm it sounds like a rattle noise and I wanted to know what could that be and also it is idleing kinda high around 1600/1700 rpm or so I know I had to put the throttle body off my old engine on the new one since the new one came from a manual and mine is a automatic it didnt have that extra point to attach the cable from the transmission.

Ok another update I fixed everything that I was concerned about but now I have another problem the car dont really want to go into gear I have to rev it up to approx. 4000 rpm before it moves but it only moves for a second then it stops I know its low on fluid almost all of the fluid came out when I replced the engine and I added two quarts of it but how much does the sentra suppose to have? And could that be the reason for it not wanting to go in to gear and move.

The car start's good, but sometimes isn't don't start and after some minutes or a instants start, also the brake light in the dash panel is on/off all time. Thanks for the help

Ok to your panal you know the little thing on the side to your left of your driver set that have a pic of a light on it that is going bad I went to a pick and pull and got one for $5 if you buy it new any where from $80 to $90

I have tried to start the car by cranking the motor, wont start. Thought it was flooded so I pushed the gas pedal to the floor and cranked it still no start.