Why will a 1988 Jeep Cherokee not start after changing the injector o-rings?

it probably has air in the fuel line i would turn the key to the run position then bleed the air out of the shrader valve located on the fuel rail ( it looks like a tire valve stem ) then try to start if that dosent work i have seen some Cherokees that you had to use starter fluid to get them to start then they act normal and start on their own after that.