Engine/Transmission (1998.5 - 2002) New Fleetguard 7 micron fuel filter

[24V-DSL]

The FS 19800 E, 7 micron fuel filter, will fit as a replacement for the FS19579 on 2nd gen trucks that can use this filter (I think back to 2K year). I just installed one today.



There has been some indication that it was supposed to be 3rd gen specific.

 

[wcjp]

I just picked up the new filter from the local Cummins NW. They had to order the filter. The counterman had never heard of it. Without the part # they wouldn't have been able to order the filter. There appears to be an indent on the bottom of the common replacement. The indent is missing from the new 7 micron filter. The shelf at Cummins mentioned the common replacement is good for 2000-06'.

 

[isb360]

Does anyone have the p/n handy for the 7 micron Fleetguard filter covering 1998. 5-99 trucks? Was thinking of switching to one at next oil change.



Also, does the finer particle filtration result in added fuel system restriction? Anyone seen pressure drop tests across the new filter? I ask because I am wondering if there would be any detrimental effects on the L/P longevity (sorry, did I say longevity?) due to extra system restriction of the finer filtration.



Tim

 

[24V-DSL]

AFAIK, the 7 micron is not released (if they intend to) for anything other than replacing the FS19579.



I don't see any different fuel pressure readings with the 7,and my system is plumbed at the VP44. Wouldn't the filter just catch smaller particles and not effect flow? I wondered about this as well. Don't understand fluid theory

 

[isb360]

I don't know the specifics of fuel filter design, but pressure drop usually goes as the square of the area, in other words, cut the area in half and increase your pressure drop by a factor of four.



To filter smaller particles I would think the "net open area" in the filter mesh would be smaller, in other words, capturing any particles larger than 7 microns and allowing smaller particles to pass through. That would mean that for a mesh size of same LxW as an old filter (10micron?), the net area would go down, increasing pressure drop, or as the system would see it, a bigger restriction to flow.



The obvious solution is to increase the mesh area (LxW), analogously to the large cone-type air filters from K&N, aFE, etc. There is a reason they are that big.....



So, if the filter is the same size to fit in the same hole, how'd they do it? Or is there just a greater pressure drop (restriction) through the filter media.



I am not hugely concerned and regardless of the answer would switch to the finer particle filtration capability in a heartbeat as soon as it's offered, which will hopefully be before the new ULSD fuel coming out in 2007.



Tim