Re: fuel pump

Posted by Owen_Dyneto On 2009/3/13 11:38:28

I never saw the vacuum pump of any two stage fuel pumps last more than 15K to 30K miles at the max.

I think the failure is much more the simple act of flexing a couple of million times rather than chemical attack from the outside (rubber side). Moisture and air certainly don't bother most suitable synthetic rubbers, and they are made to be compatible with gas and oil. All the ones I've looked at failed internally with the plies of fabric and rubber separating. No, they don't last forever but I think you estimate of 15-30K max is quite a bit short of the mark.