uh yeah...I'm on my third fuel pump and have ruptured the interior fuel lines twice. The current suspect is toluene in higher octane fuels. I still think something else. I talked to the VP of Technology for VP fuels and he said the rubber used in European car fuel lines is not the same as in the US (where ethanol is common) and may be affected by ethanol. Though if this were the case I would think there would be a lot of failures.

 

Ok, I do not think it is toluene as that is a very common race mixture and I would bet that more than half the people here use it. Xylene however, is another race mixture and quite corrosive and this may be the culprit. Do you know if the race fuel you were using had xylene in it? But I agree that if ethanol was the problem there would be more failures or so you would think, like most on this forum would have had those issues.

 

Never heard about some kind of damage...

 

The idea of it being toluene is from a Ph.D. Chemist who works for a petroleum company I personally think when the first hose was replaced, it was replaced with hose that was old/brittle, thus causing the second rupture. I'm not sure what caused the first one. It was suggested to not leave high octane fuel in the tank....leave normal pump fuel (91 in CO).

VP fuels

 

The trick would be to run E85 in our cars: would take huge fuel lines, pumps and injectors but costs 1/4 the cost of MS109

MK