Need vacum line diagram for 2003 ninja 250 ex

https://www.autozone.com/repairguides/GM-Full-Size-Trucks-1970-1979-Repair-Guide/VACUUM-DIAGRAMS/VACUUM-DIAGRAMS/_/P-0996b43f80cb0d10

Chilton or Haynes book will have the diagram also you can search on the net

Hope this helps.
http://www.youtube.com/watch?v=hZmy6ogsCK4

How do you know they were wrong if you don't know how to replace them?

what type of ford what year

Use a industrial vacume tester, check each port coming off of the manifold, run your lines.

ok i have one and i just fixed mine you need to drain the fuel from bottom of carbs and drain the tank also. then replace the spark plugs once you do that add new fuel in tank and drain the carbs again unitil good fule start runing out then shut them off. aftre that make sure there are two line connected to the petcock from the carb. spray soem starting fluid in the air box and chock it boom it will start. if it has spark.

chris

This should help alot.

I would start off by removing the fuel tank, I would then remove the line from the tank to the carbs and lightly and gently blow air from a hose into the carbs, this will free up any dirt or trash that may have gotten into the carbs.