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Fleetguard LF777 performance #5216610 09/18/19 09:54 PM
Joined: Mar 2010
Posts: 26
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Pyrotechnic Offline OP
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Joined: Mar 2010
Posts: 26
Ive found various forum conversations about this filter, and at some point the micron rating comes up, and someone will post some really awful micron number allegedly from Fleetguard and then the discussion ends. It seems to get written off as an old design not worth anyone's time. From what I understand it came out around 1980 to replace the huge LF500 bypass units that were filled with newspaper and wood chips.

Looking at a Fleetguard catalog, I see the LF777 mentioned as 5 micron, but no beta ratio. The Fleetguard LF777 is made with stacked disc media, the same kind found in the Venturi series of filters. I have a hard time believing that the 777 is a poor performer, if it is full of the same media that makes the Venturi filters so great.

Does anyone have any personal experience with the LF777 and how well it performs?

Re: Fleetguard LF777 performance [Re: Pyrotechnic] #5216775 09/19/19 06:19 AM
Joined: Oct 2004
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bullwinkle Offline
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I have experience with the stacked disc Venturi filters, and they do a really good job keeping diesel oil visibly cleaner-but it will take before & after particle counts to tell what the actual difference is.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Fleetguard LF777 performance [Re: Pyrotechnic] #5261145 11/07/19 07:20 PM
Joined: Dec 2010
Posts: 138
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jetman Online Content
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´╗┐In 2011 I was building and installing bypass filtration systems on Cummins M11 and ISM engines. I got in a discussion on a forum about what would be the best spin-on bypass filter to use on the remote mount I was using. A Cummins/Fleetguard Field Service Engineer on a forum said the LF777 was the best. A phone call to their tech dept told me the LF3542 was better. The Field guy said the LF777 is a stacked disc design and was 98% efficient at 10 microns. He also told me the LF3542 was 99% efficient at 10 microns. Both are about the same physical size and cost about the same. The threads on both are 1 3/8" x 16. I ended using the LF3542. These days I just install Fleetguard Venturi Combo filters. They do the jobs of both a full flow and bypass filters.

Venturi Combo link

Last edited by jetman; 11/07/19 07:26 PM.

Fulltime DIYer, retired pilot
12 MKX 3.7
07 Yukon 6.2
07 Toyota FJ 4.0
96 Prevost XL40 12.7
51 Chevy 5w PU Resto 5.3
92 TopSportsman Firebird w/604
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Re: Fleetguard LF777 performance [Re: Pyrotechnic] #5262997 11/10/19 04:06 AM
Joined: Oct 2009
Posts: 197
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CDX825 Offline
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Ive always wondered the same thing about the LF777 filter. I figure that stacked disc media has to do better than the pleated style of bypass filter.


1984 Ford F250 6.9 Diesel C6 2WD Rotella T 15W40 NTZ Bypass Filter

1992 Mazda B2600 4x4 Amsoil Series 3000 5W30

1998 Ford Ranger 4x4 Pennzoil Platinum 5W30

Re: Fleetguard LF777 performance [Re: CDX825] #5263122 11/10/19 08:22 AM
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Posts: 138
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jetman Online Content
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If I was doing it today, I would us the LF777.
It would be interesting to cut each open to see what is what.


Fulltime DIYer, retired pilot
12 MKX 3.7
07 Yukon 6.2
07 Toyota FJ 4.0
96 Prevost XL40 12.7
51 Chevy 5w PU Resto 5.3
92 TopSportsman Firebird w/604
241" 4link Dragster w/565
83 Glasair! TD
90 Ez-Go 2-cysle GC
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