Ferrari Mailing List: major prestone leak on '81 308 GTSi

[Michel Savard (mysavard]

1981 308 GTSi.:  My beloved 308 has a major prestone leak. It only
leaked when the engine runs. 20 minute ride loses 3 liters of prestone.
So, I figured it was the water pump. I took the right rear wheel well
out.
All I could see was a drop of prestone hanging from  a screw
(bottom-center of the water pump). With the car up on a jack, I started
the engine and had someone check where the leak was. The leak is only
from that screw only. 
 
Does that mean it’s only the gasket ?
Can a mechanic fix it through the right rear wheel well ?
How much time is required to take the pump out ?
I’ve had the car for exactly 6 years, I have no idea how old is the
pump. Should I still replace the pump even if the verdict from my
mechanic says it’s only the gasket ?
Rutlands on Ebay  has a pump for $625. Good price ? Should I go for an
alternative ?
 
Funny thing is, as I was driving yesterday, I kept saying to myself
“enjoy the ride, this is the last weekend, I’ll store it for the winter
next weekend”. AAAAAARRGGH!
 
Thank you in advance for any advice!
 
Michel Savard
 

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