2004 4.3L Chevy fuel noise

It's hard to say if anything you've replaced is contributing to the problem since I don't know the repair history and details.

Assuming everything else checks out fine, I'd definitely check the fuel pressure. Your problem sounds like a fuel delivery issue. Has the fuel filter been changed recently? They become dirty and clogged and restrict fuel flow and reduce pressure.

Fuel pumps go bad and cause problems, so do fuel pressure regulators as well as leaky fuel injectors and other fuel system parts. When fuel pump motors are going bad, they tend to act up when they get warm, which could explain the issues after 20 minutes IF the fuel pump is at fault.

You can get a fuel pressure testing kit from a local parts store; Oreilly Auto rents them for free with a deposit. Check the pressure with the engine off/key on, then with the engine running at idle. And oh yeah, checking the fuel pressure while driving at a higher speed. The fuel pressure could be good but the volume may not be enough at higher speeds, so that's something else to consider for future reference, if needed.

You'll also want to make sure the pressure doesn't drop more than roughly 8 PSI within 5 minutes, after the engine is turned off. These will all be tested against GM's specifications for your car. I'd estimate around 50-60 PSI but that's a estimate and may not be exact.

If you can have those tests run successfully, you'll be closer to narrowing down your issue.

Yes the thermostat so stuck open not allowing the motor to properly warm up or it can be the climate control went bad

Sounds like the fuel pump is going bad(or in this case,has gone bad). I suggest that you change the fuel pump and use a fuel cleaner in your gas tank as dirty gas may have caused the problem to begin with.

i'd agree sounds like a faulty oil pressure switch.doing a pressure test with a guage will
tell for sure or just replace switch ($15 part)

good luck

could be map sensor, could be fuel filter,if it was a sensor your check engine light should be on. i have a 2002 chevy avalanche and it was hard to start and the fuel pump was working but it has a valve in it that will not allow the fuel to run back into the tank and empty the lines, and the valve was bad which the only way to fix the problem was a new fuel pump unfortantually just cause it is a new fuel pump does not mean the check valve in it did not go bad

did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.

will not start or will not turn over?

If it ran out of gas you'll need to purge the air out of the fuel line. Chances are also good that you pulled some sediment off the tank bottom and clogged the filter. If that's the case you'll need to replace the filter.

If you haven't had any luck yet, I suggest that you #1 replace any rubber fuel lines that are obviously bad or even questionable. CJ's had mechanical fuel pumps mounted on the side of the crank case which ran off the cam. This means that there is no pump in the tank and any fuel lines leading to that pump will be under a vacuum. If those rubber lines are wrong kind, old or almost kinked they WILL colapse under the vacuum and temporarily shut the fuel off. #2 However, in your case it sounds like the little screen filter on the pull tube inside the tank is probably stopped up completely with debre, that's why the motor dies and won't start again. If you drop the tank and remove the screen sock from the end of the metal tube that may solve one problem. If you do this though, I suggest that you put an inline filter somewhere before the pump.

take off the fuel line at filter and see if gas comes through. If it is elsectric it should make a noise not real loud but a noise.