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Hi
The problem with the alarm going off is normal, You're SUPPOSED to use the remote, not the blade, the blade is sort of "the last resort" to get in the truck, and yes, if it was locked (which *almost* has to be done with the remote) and you use the blade to open it, the alarm goes off, and as far as i know the only (or at least the best) way to stop the alarm is to insert the key into the ignition and turn it. (sorry about the bad run-on sentence)
As a matter of fact, the truck originally should have had a pair of black block-off plugs to keep the key from easily being used in the door lock cylinders, but people don't care, they take them off and toss them.
Yes, if the fuel filter was original, when replacing the pump you should have done the filter update (new long-style filter along with the updated lines).
Yes, the regulator is integral to the filter, and yes the regulators have been known to fail.
It's relatively easy, IF you are careful, to see if there is at least SOME fuel pressure by using the connection point on the fuel rail (press on end of schrader valve with small screwdriver or what have you, but don't get sprayed!).
It could still be a key problem, it can be pretty weird. Or maybe not the key but the DAS antenna for example. Best way to check for start authorization is to watch the small red LED dot above the foglight switch. When you turn the key to crank the engine, you should see a very short blink, about 500 m/sec blink, which indicates that DAS is authorizing the start.
Gilly
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