T&T: 2 10 30 Micron Filters??

[Bob Clinkenbeard]

Here is what I have found at 
http://www.filtercouncil.org/index.php?page=heavy-duty-diesel-fuel-filters

Q: What is the difference between a primary and secondary diesel fuel 
filter?
A: The primary fuel filter must offer low restriction because it is mounted 
on the suction side of the fuel pump where normally a suction pressure of 
only 5-6 pounds per square inch is available. This filter has the job of 
protecting the transfer pump and lightening the load of the secondary fuel 
filter (if installed). Primary fuel filters typically have a nominal rating 
of 10 - 30 microns.

Secondary fuel filters are mounted between the transfer pump and the 
injectors. The secondary fuel filter is designed to offer full protection to 
the fuel injectors. Since these filters are mounted after the transfer pump 
they tend to see much higher pressures than primary filters. Secondary fuel 
filters typically have a nominal rating of 2 - 10 microns.



Bob Clinkenbeard
24' custom trailer trawler
http://home.bellsouth.net/p/PWP-aboardbobbinalong