I bought this broken down dodge dakota, it needed a fuel pump and i got it, I installed the fuel pump recently and the truck starts up now and runs really good.

the problem is, there is a cap that was connected to a hose
that didn't come with the replacement fuel pump, it goes in this hole in the top
my brother told me it was vacuum circulation

Does anyone know where I could find this part or what to search even?
please help, I'd appreciate it alot, thanks

 

Pressure relief or also known as the roll over valve

 

i know obvious but can u take it off the old pump and put it on the new one?

 

You can but you have to be careful. Spray both sides of the valve with WD-40 around where it contacts the rubber and work it out slowly by prying it out with 2 screwdrivers. Small pry bars work best because they're angled unlike screwdrivers. GO SLOW. It's plastic and if you pry too hard and fast it will break.

A.J.