Did install a new fuel pump on a 1990 Nissan 300 zx. still wont start and do have spark. also have ordered a fuel pressure regulator hoping that will fix the problem. any other ideas?

Answer 1

Do your injectors fire?

You can check this by find the CAS on the front of your engine, it is the metallic part that has the Mitsubishi logo on it. with a 4 prong connection on the right side. (Mark with something the position of the CAS on the part it's bolted to) if you take off the 3 bolts holding it in place. you can CAREFULLY pull it out of it's socket. It will probably take a little bit of prying with a screw driver, take your time and lift it out evenly. It took me 20 minutes to get it out, but it still worked when i put it back in.

When you take it out of the fixture it will have a rod that will turn, it looks like a T. If you put your car to the "On" position, and you SLOWLY turn this rod you should be able to hear the injectors fire in the cylinder.

DONT flood your engine, you can also take out your spark plugs to air out your cylinders or just to hear the injector better. If the injectors fire, then you have fuel going to them and the CAS is working.

Replace this part back in the original position, use a little bit of wd 40 or other lube to get it back on easier. Remember the pole is keyed so it only goes on one way. Line up the marks you made earlier to put it back to the same timing, and bolt it back down.