Locating the fuel pressure regulator

Fuel pressure regulator may not be working properly, allowing fuel pressure to bleed off overnight. Try (before going to crank position on key) turning the key on for 3 - 5 seconds, then back off. Do this three or four times. (The fuel pump will run for 3 - 5 seconds before the ECM turns it off if you don't go to the start position.) This should allow pressure to build to what is needed initially to start the engine. Now try to start normally. If this works, you need a new pressure regulator. It is located either in the fuel rail, or on the fuel pump itself.

Yes it could be the cause. Make sure you have a good engine vacuum signal to the fuel pressure regulator, I suggest you replace the vacuum hose as well as a poor vacuum signal from the engine will cause the regulator diaphragm to "vibrate" and be noisey, this plays heck with the fuel pressure and this may be why the stall.

If you have already checked the relay and fuse then have someone bang on the fuel tank hard while you crank the engine, if it starts then you know you have a bad fuel pump.

it is located under the UPPER Manifold, inside.......ok!

The fuel pressure regulator for this vehicle is located inside of the air intake plenum, you must remove the plenum to gain access to it.I hope I could help, rate me accordingly, Thanks!!

the pressure regulator may be leaking. pull he vac line and see if its wet. wet is bad. Also these fuel pump connectors are known to overheat from poor connections. Do a search on gm fuel pump repeat failures and overheating connectors. Also the fuel pump could be leaking down so the line needs to be primed. Try cycling the key about 3 to 5 times before you start it. The pump will prime for 3 seconds each time before shutting off. If this helps the problem is the fuel pump.

If you look at the top of the upper intake manifold plenum with the air intake duct work off you will see 2 shiny fuel tubes that feed into the fuel meter body. The fuel meter body also has an electrical connector right in the middle of it. The pressure regulator is mounted on the side of that body. You'll have to remove the upper intake manifold manifold to replace it. Before you do that, be sure to bleed the pressure off the fuel system.

Two places to look...if you have separate injectors for each cylinder then regulator should be at the front end of the fuel rail. If you have throttle body injection it is on the throttle body itself.

Your Tahoe does have a vacuum line connection to the regulator. It's also possible the regulator itself is bad,
Greg

replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump