What is YOUR take on this PROBLEM? Help!

2001 K3500 Crew cab 4 x 4, 8.1 Vortec ( Gas ), 98,700 miles
Three weeks ago I was driving to a local town (slight incline on road).
Truck died for a couple of seconds, message center light came on RED, truck
resumed running????????? A week later, sitting at an intersection (Stop
light) truck died, again, I tried to start (would not fire, just turned
over), got out directed traffic around my stalled vehicle. Got back in,
turned the key, re-fired and drove off???????? A few days later, driving to
work, truck died AGAIN, like the first time it resumed running after a
couple of seconds, message center light RED (again NO codes).

So I call my mechanic, explain the problem to him, I suggest a
tune-Up......he says bring it by to run the codes. We run the codes..
NOTHING........he thinks it is a Fuel Pump..........Talks to the shop owner.
He says Fuel Pump.............SUPPOSEDLY a problem in 2001 trucks??????

Make appointment to replace Fuel Pump. Pick up truck late Friday afternoon
( long weekend ahead, need truck for work), replaced Fuel Pump, Fuel Filter
+ Labor $705.16. Mechanics says the OLD fuel Pump was drawing 20 amps, when
it should of been drawing 10 amps.

Sunday morning heading out on my appointed rounds, TRUCK DIES AGAIN.
However, this time it is DEAD for 5 + seconds before it starts running
again. ALL three times it has died I have not turned the key to restart.
It STOPS RUNNING and then STARTS RUNNING again. I continue on my journey,
go to the farm, head home. On the way home, I run across some VERY ROUGH
railroad tracks.........I am thinking if there was a loose connection it
would DEFINITELY show up here..........everything was fine (anyway the truck
kept running).

I call my mechanic at home Sunday (used to be my neighbor).........he says
bring it in and he will put the old Fuel Pump back on as that MUST NOT be
the problem.

Replaced Fuel Pump and Fuel Filter...............Did NOT fix the PROBLEM!

I know from lurking on this newsgroup there are some pretty talented
mechanics...............I NEED YOUR HELP!

Thanks!

I had a similar problem with a Bonneville.

After an exhaustive search, it turned out to be part of the security system.

If an incorrect key (or no key at all) is used to start the vehicle, the
security system shuts down the fuel supply to deter theft. If the system is
screwed up, you can see where it might exhibit the symptoms you are seeing.

Does your truck's ignition key have the security chip in it? If so, do you
have another set of keys that you can use for a while to see if the problem
goes away? If it does, you can bet the security chip in your first key is
bad.