1999 jimmy wont start

i have a 1999 gmc jimmy that wont start . fuel pump 1 year old just changed fuel filter and new battery. keeps cranking doesnt turn over.going to try some carb cleaner anybody have any other suggestions would be well appreciated:)

Along with fuel pressure check- do a spark check- preferably with a spark tester- if no spark - sheck for ignition voltage at the pink wire under the dash- needs to have 12v during "run" and "crank"- have seen bad ignition switches have no power during "crank"

tried carb cleaner spray turns over runs ok when it off have to use spray to get it running again

Sounds like insufficient fuel pressure. Try doing a fuel pressure test.
Could be the pump or fuel pressure regulator.

know my gas gauge is going wacky

I agree, sounds like fuel pressure problem. If your pump was changed with an airtex pump, I have seen them go bad after a week, so it means nothing that it is a year old. There is a reason the factory ones are so expensive ;). That being said, with the fuel gauge acting up also, I would check the fuel pump ground first. I think on your car it is on the frame back near the tank. You should be able to follow the wires on the top of the tank to the ground. It might be easier to take out the spare tire first.

i changed the fuel pump no problem starting up now. thanks everyone for the help now i am getting a code manifold absolute pressure code