Hey everyone this is my first post because i am stumped i have a 1994 chevy s10 blazer and i just been haveing problem with it recently first noticed that my gas gauge wasnt right it keep moving up and down all over the place put gas in didnt lift up was bobing up and down then went to put more gas and tank wasnt full i dont think gass came flying out of the take somewere look to be on top know i have this problem were ill be going down road fine then i will push gass and it start to chug no power but never dies and i mean it chugs like not even moving if i put in neutral while coasting i just shut off 5 second later start up got power again please help me

 

Fuel pump/filter

 

Yeah most likely a pump problem but you should check entire fuel system. Do a leak down test at the port in the fuel line to the upper plenum. Do a Max Pressure Test on the pump at the outlet side of the fuel filter and make sure the filter is not blocked or plugged. And only use an AC Delco or Delphi fuel pump. some have said the borg warner pumps are ok too but i don't trust anything other than Delco or Delphi parts for ignition and fuel supply on GM vehicles.