Re: fuel pump

Posted by PackardV8 On 2009/3/13 7:28:04

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

It's a bit hazey to me but IIRC the intake manifold connects to the vacuum pump and the vacuum pump connects to the wipers. i.e. engine vacuum passes thru the PUMP before it gets to the wiper motor????? I think that's what Owen was trying to say with all of the "series" and "parallel" jargon.

THE PROBLEM is that the vacuum protion of the two stage fuel pump is constantly exposed to fuel, AIR AND MOISTURE. NOT a good mix.

Route thru a balancing valve to eleminate the short life tendency of the two stage pumps. OR any other way to keep the fuel,air and mositure out of the vacuum pump. I never actualy tried routing thru a balancing valve on any of my cars tho. Should work.