<VV> Viton in Ethanol Gas Re: viton pump cups

[FrankCB at aol.com]

JR,
 
There are various types of Viton.  While some of the specialty types  can 
handle 10% ethanol gasoline, according to this reference the best GENERAL  
type of Viton for this use is Type F:
 
      _http://www.pspglobal.com/viton-selecting.html_ 
(http://www.pspglobal.com/viton-selecting.html) 
 
Frank "comical engineer" Burkhard
 
 
 
 
In a message dated 8/31/2011 12:58:25 A.M. Eastern Daylight Time,  
hmlinc at sbcglobal.net writes:

Further,  and again IIRC, it seems to me that there were some questions 
about 
using  viton in this application.  They went along the lines of - potential 
 
greater wear on metal components of the carb....  viton resists heat  
better 
than neoprene (or whatever they are made of today - the black  ones), but 
is 
heat the problem in this application......   is  viton more or less 
resistant 
to modern gas than the current black  stuff.....

I do not know the answers to any of the things above and I  do not know 
what 
(black VS brownish) substance goes into modern pump  cups.  I'm hoping for 
something (like modern 'rubber' fuel line)  which is at least resistant to 
the alcohol in the gas, but I simply do not  know the answers here.  I'm 
also 
hoping for a material that does not  wear out the carbs rapidly.

Perhaps someone else on VV has looked into  this more deeply than I and can 
provide some appropriate  suggestions.