You can check for spark the old fashioned way you are used to.
From your original post I didn't think your main problem was the crank sensor. You probably had an intermittently bad crank sensor and another problem too. Since you had crank sensor codes you are better off with the new one. If you have spark, I would look at the fuel regulator next. Check the vacuum line running to it for cracks and also try to smell and look for gas.

I'm getting more frustrated by the moment.
Replaced the fuel pressure regulator, still wont start. Here'* where i'm not sure what could be the problem. While I was replacing the regulator and relieved the fuel line pressure, fuel came out of the relief valve with a pretty good spray. But once I replaced it and the car still wouldn't start, I pressed on the relief valve again to see if there was fuel there, and fuel came out, but it was more like water coming out of a hose, no spray like there was some pressure behind it.
Can the fuel pump go out like this? Still pumping gas but not with enough pressure? Is the fuel filter a possibility?
Now if it would only stop snowing here so I could work on the car

Check to see if the plugs are wet. Did you test for spark? If you did have a bad regulator the plugs could be soaked to the point it will not start.

I'm feeling your pain bro... My bonnie'* been acting up like this also. You can get a pressure gauge from Autozone for a $150 deposit (refunded when you bring it back). Then, you can check the pressure at the port. It should be 53-59 psi (as per Alldatadiy.com). I'm thinking the pressure regulator or the fuel pump.

One other sugggestion. A buddy of mine said that fuel pumps typically die via a "dead spot". So, they will usually seize up in this "dead spot". He said a mechanic check a fuel pump on his truck by turning on the ignition, listening to see if the pump was running, it wasn't running, then he banged his hand on the fuel pump area and you could hear the pump spin up. I'm gonna' try this tonight (and also check the fuel pressure).

I've replace the plug wires, replaced the fuel filter, replaced a MAF sensor (got a check engine light code on that one). So, now I'm down to the regulator or the fuel pump. I had replaced the fuel guage portion of the pump about one year ago. Wish I had just replaced the pump now... Oh well. Good luck!

Shawn
Priceville, AL (no snow here thank goodness)

Autozone fuel pump $272 (1yr warranty)
Dealer part $568
GMPartsDirect $295 + */h
Advance Auto Bosch fuel pump $355 (limited lifetime warranty)

My buddy was told by his mechanic that GM fuel pumps (at least these) don't like ethanol. So, if I have to replace the fuel pump, I'm probably gonna buy the Bosch item.

Good Luck.

Check the prices at Auto Parts Fast at RockAuto

Update as of tonight.

I installed a new fuel pressure regulator. Before I took the old one out, I took some readings. I was getting around 46psi for ignition on. I could hear the fuel pump spin up and then turn off (normal). When I start the car, I would get around 52psi. The weird thing was, if I did the ignition on and got the 46psi, if i continued to monitor the pressure after i turned the ignition off it would creep up to 50psi?

Anyway, installed a new regualtor. BTW the brand of regulator sold at Autozone ( Gp-Sorensen #800-302) does not fit a 2002 bonneville. I even check the vendor'* catalog online. Autozone looked it up correctly, it just won't fit. I got a regulator at Advanced Auto that did fit (i think it was a BWD).

So, after install, i took some more readings. I was getting lower pressures at ignition on (around 35psi?). Alldatadiy says that it may take a few cycles to get to the max pressure. I'll check it again tomorrow. The pressure reading while running is very different than what i saw with the old regulator. The pressure oscillates from 48-52psi. So, I'm hoping that the old regulator wasn't working properly. I'll let you know.

I did get a surging with the old regulator. During this surging, I listened to the fuel pump and it would also oscillate (the pump whine sound would vary in pitch). So, either the regulator was causing the pump to change speed to compensate or the pump is truly going out. But,the pump never did stop running.

I'll post more later.