1999 Dodge RAM 2500 4x4 Crank With No Start

[C-MAN]

Hello, everyone; I require some advice and help.

I have a 1999 RAM 2500 that had been running great, and I got in it yesterday to start it up and cranks and won't even try to light off.

This happened out of nowhere.

This truck also has had a "dumb" wait to start light that only comes on when it feels like it when turning the ignition on but has been starting up until now.

I've checked all the connections to my FASS and verified the pump is fully primed via FASS fitting at VP inlet, and I can't seem to get any fuel to bleed out of the injectors when cranking, which leads me to believe it is an ECM or VP issue and since both are relatively expensive parts.

I'm hoping these codes mean a definite VP issue and not both simultaneously.

The truck has right at 200k and still has its factory VP44.

Is P1688 a specific VP death code, or can this code be generated from a bad ECM not commanding the pump to turn on?

I appreciate any help you can provide.

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