1998 gmc 4.3 starts up but loses power 3-5 mins later,will restart and run again for another short time,fuel filter has just been replaced.

This could have several problems. #1 Fuel pressure due freezing water in fuel lines add thermal aid or rubbing alcohol . If you have access to a pressure gauge there is a service fitting on fuel rail that you can test pressure while driving and see if the pressure is gone when car dies this could lead to fuel pump electrical or more restricted lines. #2 intermittent sensor failure Mopar uses 2 sensors to control spark and fuel lose one could lose spark lose the other lose injection with a scanner they call it C/C sync ok (cam/crank) if no then check for each parameters for display.# 3 relay controls ASD and FUEL pump for voltage drops.

Check again piece by piece all that you just replaced to make sure one of then is not faulty from that house.
Check the oxygen sensors
The engine PCM
Catalytic convertor

Wish you luck

Check to see if fuel is getting to the filter. Maybe too much dirt in lines & plugged filter? If fuel at filter, put hose in place of filter JUST LONG enough to see if fuel is getting to fuel rail.

my 2003 grand caravan 3.3l run for 30 then daying and fuel pump making noise you can restart again it run for 2 to 3 min dies again pep boys change crank sensor fuel pump no help when eng shutdown middle of high way or trafic no fuel to eng does have elect power no eng check light any help

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Try removing the idle speed motor on side of throttle body, and spray it clean, as well as the port it came out of, with throttle body spray cleaner. Don't pull and extend shaft of idle motor, just leave it in position it's in, and make sure you don't lose small "O" ring on idle motor. Re-install and try it. If it cures it for a while, then starts to do it again, replace the idle speed motor.

my 1998 2500 sierra fuel pump has been replaced inside the fuel tank already,now a year later it's dying again when driving ,like it is not getting fuel at all! I have a 5.7L engine, is there a in line filter somewhere?

Sounds like there may be a fuel filter problem, try replacing the fuel filter. Specially if you have not done it over a while.

replace throttle body injector

the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.

try the fuel filter