I'll start from the beginning. My fiance and I bought this car at one of the local car lots, he's known the guy for a long time and we actually got a good deal on it. The guy told us that the fuel pump was replaced and we can actually hear it switch on when the car is switched on. We initially had to replace the front crank sensor due to starting issues. So that was all well and good for a while. Then we noticed that once the gas gets down to like a quarter tank, it starts sputtering and just acting fool. Figured it was just trash stuck in the injectors or something since the car sat up for a while without being cranked. Still not sure about that. Well last week the car decided to crap out on us. We thought maybe the starter solenoid was to blame so we replaced it (it needed replacing anyways) but it didn't solve our issue. It wouldn't start, like it's getting no fire to it. He checked all the plugs and they are all getting fire. He replaced the rear crank sensor and the cam sensor but it's still not firing. Kind of running out of ideas as to what to try now. Any suggestions would be useful. He's pretty auto savvy so I'm sure he'll understand the responses better than I will.

Thanks in advance!

 

I highlighted what I believe is some key information in your post. When the fuel pump was changed, did they change the strainer? And more importantly, was the strainer installed correctly? Because if the strainer was installed incorrectly at an angle instead of flat/parallel with the bottom of the tank, the pump will be unable to suck up gas once you're below 1/4 of an tank. I've seen this mistake before.

 

The problem is likely that the previous mechanic did not reuse the OEM fuel sock that picks up the fuel from the very bottom of the tank.

The aftermarket pumps come with a new sock that is shorter than OEM, so if gas gets too low, your car dies.

This isn't good for several reasons and needs corrected; unless you feel like keeping your car over half a tank for piece of mind.

Junkyard will have a fuel sock, and it is likely that you will burn out the new pump if your trying to run it without it being able to suck up any gas.

You will need an o-ring too if your replacing.
Pretty simple DIY, and there is a YouTube video specifically for our car.

 

Here's that video:

 

We aren't even sure if they actually did replace it. But my fiance says that it's getting fuel, he says that the sensors aren't getting any power to them. I've been researching and after finding a FSM for the car, he seems to think it could be something to do with the ECM...I'm not familiar with any of this stuff.

Could there be any other issue that could cause the sensors to not receive power besides the ECM? How could I tell if the ignition switch is bad? Or if the coil is bad? Would those factor into the car not firing?

Thanks for the information so far.

 

Car not starting is either fuel or spark.

If it's a '99, there could be NATs problems.

To try the ignition switch just give the key a wiggle or it pretty easily comes out so you can manually test it with a screwdriver.

Just curious, did you find the FSM from my link? Hoping that has helped someone sometime. Lol

 

If the problem only exists under 1/4 tank it is NOT the ecu or sensors. It is a problem in the tank.

 

Getting fuel and getting good fuel pressure are not the same.

 

Sounds like fuel to me as well. Coils exhibit some different symptoms (misfiring, usually kill a car after it's running) and can be tested just by running the car and pulling each individual coil, see if engine operation changes and if nothing changes you know that coil is bad (of course you can't do this if car doesn't run). Bad ignition switch you can test easily like said above, use screwdriver. If you have a bad ECU that's a whole different story.

I would fill up the tank full and see what happens, then go from there and test starter/plugs/ign switch/etc if needed. Is the check engine light on? any codes you can pull?

Sounds like you may just have some bad old fuel in there too from what you said in OP. Does your starter turn? I see you've replaced the solenoid so maybe something is wrong there with the starter.