The 2 gallon tank on my shallow well pump needs replacement, but?

[Qmavam]

I see there are 2 gallon expansion tanks and the there are 2 gallon tanks for pumps.
What is the difference?

 

[Qmavam]

Can I use an expansion tank as a storage tank on my pump?

 

[GReynolds929]

Can I use an expansion tank as a storage tank on my pump?

Not effectively, there is a bladder with air that limits capacity to maybe 30-40 percent. If storage is needed a cistern or holding tank is best.

 

[Qmavam]

Hmm, that's not it, most Pump storage tanks have bladders in them now a days, just as the expansion tanks.