'98 GMC Suburban K2500, fuel problems

[theodo]

I have a Vortec 454 engine in my 1998 GMC Suburban. It dies frequently when driving. The fuel pump and relay was replaced a week before I started having this problem, and it was working great. After it dies, it is able to start back up instantly. I just replaced the throttle position sensor, and am still having the same problem. I had a mechanic tell me it might be an electrical problem turning the fuel pump off. I checked the female connectors to the fuel pump and they are not burnt. Do you know what the problem is? Please and Thanks. Ted

[MT-2500]

First check fuel pressure.
It should maintain 55/62 lbs of pressure.
How about codes and or check engine lights?
What was the problem or code on tps sensor?
What is the mileage and tune up history?

[theodo]

There are 154k miles on it. New plugs at 150k. I got a P0172 code on my OBD2 code reader. I never really had any problems until the last two weeks. I thought that I was out of gas - even though it showed 1/4 tank of gas. Ended up towing it home. Replaced the fuel pump with an AC-Delco MU-152 unit. A new fuel pump relay and throttle position sensor. I filled it up and it worked great until the tank got low. Thanks for your help and suggestions ....this is an awesome forum. Ted

[MT-2500]

Make sure it is not out of gas.
Add 5 gallon and see what it does.
A good rule is never run it below a 1/4 tank of fuel.
MT

[theodo]

I'll try that , and thanks again....Ted