But having a pump that blocks flow when it isn't
> running immediately begs the question of, "What is the point of the
> valve?"  Not thinking for a moment that I know it all, I present the
> question here.
>

Answer....the fitting that attaches the fuel line to your pump leaks, or the
fuel line to your pump develops a leak. How you gonna stop it? Just a
thought, not necessarily a good one. 

 Paul Conner

 

But what happens when the fuel line to the shutoff valve leaks?

Sorry, couldn't stop myself : )

 

Tracy  (still slap happy after a day of travel trailer renovation)