Old Goat
Full Access Member
Goat
any 6.9 fuel water separator alternatives?
- Thread starter Austin86250
- Start date
Goat
sheepman
TDS Refugee
IIRC the stock 6.9L thread size is 7/8-14 and the 7.3L is 1-14. Please correct me if I’m wrong.
I went with the 7.3L because I had a few from trucks I parted out. I’ve never had one leak, not say they don’t from the heater hole. The one that’s on the 84’ I replaced the oring with Viton from diesel Orings.
Picked the wix 33417 for its all in one design. It’s doesn’t filter as good as a 6.9L secondary filter IIRC those are 10-12 depending on brand. What’s a few microns, besides lota 7.3L still on the road.
I went with the 7.3L because I had a few from trucks I parted out. I’ve never had one leak, not say they don’t from the heater hole. The one that’s on the 84’ I replaced the oring with Viton from diesel Orings.
Picked the wix 33417 for its all in one design. It’s doesn’t filter as good as a 6.9L secondary filter IIRC those are 10-12 depending on brand. What’s a few microns, besides lota 7.3L still on the road.
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sheepman
TDS Refugee
What’s the part number for the filter base you attached to the frame?
Farmer Rock
just a fella' without a 10mm socket
I've used 6.9 filters on my 7.3, and 7.3 filters on my 6.9. no problems, they both threaded on and sealed correctly.
I'm not saying anybody is wrong, that's just my experience.
Rock
I'm not saying anybody is wrong, that's just my experience.
Rock
Not true. The 6.9 filter (FD-811) threads are 7/8"-14 and 7.3 (FD-3375) threads are 1"-14.
Austin86250
Full Access Member
Rock, are you sure they are the same? when i replaced my friends 7.3 filter i tried to see if it would fit in my 6.9's and the 7.3's threads where much larger than the 6.9's it just went right over the treads
also i did not see any filters with petcocks on napa for the 6.9
Farmer Rock
just a fella' without a 10mm socket
Well....I guess my trucks must be different..
I never had trouble interchanging them on my trucks, but who knows why that is.
Rock
I never had trouble interchanging them on my trucks, but who knows why that is.
Rock
TNBrett
Full Access Member
Perhaps the previous owners had upgraded the 6.9’s to 7.3 filter bases. Also I’m not sure if the Ford 6.9 filter is the same as an International truck 6.9 filter.
IDIBRONCO
IDIBRONCO
Looks like it's time for Cubey to straighten us out on this too. At least the Internationals and the vans use the same filter housing as far as I know.
Jesus Freak
Full Access Member
Cubey is right, they're different. I use the 6.9 ones because I'm cheap.....or irresponsible....
Yep. I have an FD-811 on my RV, where the fuel filter on the driver side.
Farmer Rock
just a fella' without a 10mm socket
I'm curious if it was because my two 6.9s were both 87s. I know they did some things that were specific to that year. It could be, they upgraded to a 7.3 filter head for that year with the rocker arms, and GP system.
Rock
Rock
Booyah45828
Full Access Member
My bus (1984 IH 6.9) has 2 filters, a primary/water separator mounted on the radiator support, and a secondary mounted on the engine. Both are factory IH equipment with primary being wix #33439 and secondary being wix #33811. The primary is 1"-14 and the secondary is 7/8"-14. I've replaced the leaking primary filter with a racor aquabloc unit.
The spare engine(also an IH) is a 7.3 out of a 1992 IIRC. It uses one fuel filter, which is engine mounted, being wix #33617 1"-14.
The spare engine(also an IH) is a 7.3 out of a 1992 IIRC. It uses one fuel filter, which is engine mounted, being wix #33617 1"-14.
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Nope. My 87 F250 has the 6.9 filter head. It has the firewall mounted water separator. Correct me if I'm wrong, but that wouldn't be there if it was meant to have the 7.3 filter and bowl.
Farmer Rock
just a fella' without a 10mm socket
Both my 6.9s didn't have the factory water separators, and as far as I know, came that way.
Rock
Rock
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