2.0L what if I don't have the fuel pump compression spring and cap?

[pcrussell50]

I've been running pretty nicely without this:
https://www.boats.net/product/mercur...0c4065ab5d0ac1

and this:
https://www.boats.net/product/mercur...0c4065ab5d0ac1

Parts 37 and 39 from here:
https://www.boats.net/catalog/mercur...sign-fuel-pump

Anyway, it runs well except it under low rpm, it eventually drains the fuel line dry. Could it be that not having the spring and cap are causing a weak pump signal at low rpm?

-Peter