pre-fuel pump repair

[Rojo2G]

My mech. told me the pre-pump is not working but that it was only a problem if
the tank was below 1/2 fuel. I decided to replace it myself and think its
pretty simple but...I'm concerned about the residual gas fumes in the tank when
I take off the (collection of hose/tubes) cap. I'm thinking of getting a can of
CO2 and spray it into the tank until used up. Otherwise I'm clueless.
Thank you, Rojo

 

[Rod Gray]

If it works when the tank if full it is only the bellows hose between the
pump and pipe above it. Less than $10 even at a dealership.