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6.5 diesel filters #4435728
06/19/17 09:05 AM
06/19/17 09:05 AM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Had low pressure with the following:
Mr Gasket pump, 10 mic racor filter, clear fuel screen filter, OEM pump, 2 micron filter.
It started out fine, then pressure dropped to 5 psi.
I cut the 2 micron filter open, it was clean. The fuel bowl on the 10 micron was clean. I did get some white and some black chunks in the clear screen filter.
My fuel return line on number 1 cylinder kept popping off.
When I switched to just the fuel screen it ran fine.
I want to go to a filter system similar to what I had, but 30 and 10 micron, then if I can the 2 micron.
Thoughts?

Last edited by Corelokt; 06/19/17 09:07 AM.

86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.
Re: 6.5 diesel filters [Re: Corelokt] #4436084
06/19/17 05:15 PM
06/19/17 05:15 PM
Joined: Apr 2015
Posts: 377
Kelowna, BC, Canada
A310 Offline
A310  Offline
Joined: Apr 2015
Posts: 377
Kelowna, BC, Canada
Originally Posted By: Corelokt
Had low pressure with the following:
Mr Gasket pump, 10 mic racor filter, clear fuel screen filter, OEM pump, 2 micron filter.
It started out fine, then pressure dropped to 5 psi.
I cut the 2 micron filter open, it was clean. The fuel bowl on the 10 micron was clean. I did get some white and some black chunks in the clear screen filter.
My fuel return line on number 1 cylinder kept popping off.
When I switched to just the fuel screen it ran fine.
I want to go to a filter system similar to what I had, but 30 and 10 micron, then if I can the 2 micron.
Thoughts?

Just my 2 cents worth on this one.:) Being that the 6.5 has the old pump and injectors they were filtered down to 10 microns much the same as my 93 cummins. Why not run a Racor 20 micron water separator after the tank and then a 10 micron after the lift pump. Not sure why the return line is coming off though as this should have nothing to do with the primary and secondary fuel filters. This filtering setup is more than adequate for the 6.5.


2009 Ford F-350 (Detroit 4-53T)
2000 Ford Excursion (Triton V10)
1993 Dodge D250 (Cummins 6BT)
Re: 6.5 diesel filters [Re: Corelokt] #4441200
06/25/17 03:00 PM
06/25/17 03:00 PM
Joined: Oct 2004
Posts: 7,974
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,974
Cincinnati, OH, USA
Believe the maximum Stanadyne IP pressure is only 5 PSI-wonder if your return line is clear (causing the return line blowoff, & risking blowing seals out of the IP)? I agree with A310 above, and add that 10 microns would be a good enough level of filtration, a 6.5 or 6.2 IDI isn't going to be as picky on fuel cleanliness as a HEUI or CR system.


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)

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