A bottle test???? I am totally new to the diesels and have no idea what you are talking about sir...
No worries, we all started somewhere. The FPRV (fuel pressure relief valve) opening prematurely is more common with earlier trucks, but still worth eliminating. If it does, you will lose your fuel rail pressure and the truck will go into limp mode. The best way to test the FPRV is the bottle test
On the drivers side fuel rail near the firewall there is a horse shoe shaped 1/4" hose close to the glow plug bracket. disconnect the hose closest to the drivers side where it comes out of the fuel rail. Then simply hook up long hose and clamp it tight and plug the "U" shaped hose.
Run the hose to somewhere that a bottle can be mounted. If your hose is long enough, you can mount it between the coolant tank, and airbox. This really doesn't matter just as long as you can have the bottle standing in a up right position.
Now drive the truck hard, with some wide open throttle runs.
After you do this, check the bottle. If its empty, or has a little fuel, your FPRV is not bleeding off fuel and you don't need to shim the valve.
If it has more than a little fuel, that means that your fuel rail relief valve is leaking and you will then need to either shim the valve, or install a race valve.
2005 Silverado EC/SB, LLY, 4WD, EFI DSP5 V2 (Idaho Rob at ATP), Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, Allison Deep Pan w/ Suncoast Filterlock and Transynd ATF, Bilstein 5100's (Norcal), Cognito UCA's, 17" NBS alloy rims, 265/70R17 Michelin LTX M/S2's, Pioneer AVH-P3200BT, CubbyCam Backup Camera, Pop & Lock Power Tailgate Lock, Extang Solid Fold Tonneau Cover, Tekonsha P3 Brake controller, Alphatherm AT-38OD Washer Fluid Heater