Chevrolet Repair: chevy, fuel gauge, fuel pumps

Question
okay i have a 2002 blazer from chevy and i was on my way home and the car just died we thought it was out of gas but no luck and so we towed it home changed gas filter, spark plugs wires distibuter cap and rotor  still no luck i get very weak spark and we replaced the coil still no luck if you have any at all suggestings it will help just give me your oppinion it will help so please dont say its not my expertize cause i really need my car fixed i have a family to take care of but i cant work with no car so please
THANK YOU

Answer
HI DUSTIN,HOW DO YOU KNOW IT IS NOT A FUEL PROBLEM???? I HAVE REPLACED MANY MANY FUEL PUMPS ON THESE TRUCKS. IF YOU CRANK THIS ENGINE OVER AND HOLD DOWN ON THE FUEL CK VALVE[SHRADER VALVE ON FUEL RAIL] WHILE ENGINE IS CRANKING THERE SHOULD BE FUEL COMING OUT OF VALVE THE HOLE TIME IT IS CRANKING NOT JUST FIRST CRANK OVER.. DO NOT CK FOR RESIDUAL PRESSURE,MEANING HOLDING VALVE IN AND GETTING SOME FUEL OUT. THIS WILL FOOL YOU ALL THE TIME. THE BEST WAY TO CK IS WITH A FUEL GAUGE AND VOLUME TESTER..PLEASE MAKE SURE THAT THE ABOVE IS CORRECT FIRST..YOU ALSO SAY THAT THERE IS A VERY WAEK SPARK. THE COIL SHOULD OF TAKING CARE OF THAT..THE SPARK SHOULD NOT JUMP MORE THEN 1/2 INCH OR SO. THE FACT THAT YOU SEE SPARK RULES OUT A IGNITION SYSTEM FAILURE. IF YOU CAN GIVE ME MORE INFO ON THIS I WILL ANSWER FURTHER ON MY LUNCH HOUR. I HOPE THIS HELPS YOU. TOM.