= ; Steve, I do not know what pressure.  BUT, you can fill it and ch= eck
for leaks with soapy water spray.  No leaks then tank is good. &nbs= p;These tanks
are made from very thick metal, 1/4", about.  The usual place for m= ajor
deterioration is BEHIND the data plate.  Since it was welded on in = only the
four corners the tanks tend to rust badly behind this plate.  New t= anks from
Manchester Tank, the OEM manufactured of these tanks, have the data plat= e
welded on solidly all around, guess they know there was a problem, DUH !=  I
highly recommend that you remove the data plate by cutting through the w= elds
with a hack saw.  Do not use a grinder or any implement that will m= ake sparks
while cutting the welds.  Once the tag is removed clean the surface= of the
tank well with a wire brush and check that the surface of the tank where= the
data plate was is solid and not leaking.  Small pinholes develop he= re first.  
If no leaks are found then you can clean the rest of the tank with a wir= e
brush or by sand blasting then prime and paint with good automotive rust=
preventative primer and paint.  Then top coat with paintable rubber= ised
rocker guard.  This will extend the life of your tank for a few mor= e years.  
Best is to check it now and then for paint loss and further rusting. &nb= sp;It is
in a very hostile environment under the vehicle getting constantly
sandblasted by road debris.  

Cheers 

Frank Condelli
Almonte, Ontario, Canada
BusFusion a = VW Camper event in Almonte, June 7-10
'87 Westy & Lionel Trains
Member: Vanagon List, LiMBO, IWCCC & Capital City VW Club
Vanagon/Vanagon Westfalia Service in the Ottawa Valley
STEBRO/Vanagon Stain= less Steel Mufflers  
Frank Condelli &a= mp; Associates or http://frankcondelli.com