Can you just change the pump without the all plastic cover taken a part the case for the pump?

I was told by a GM troubleshooter, there is too much presure injected thru this system and it will knock the small fuel line with clamp "off" connected to this plastic housing...The fuel pump assembly is the best bet, and don't forget a new connector with this assembly, this is also a must buy for a few bucks more. It will save you much time and money.