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i ain't rite
Joined: Mar 2005
Posts: 65,579
Likes: 5,611
From: Marlboro Mental Hospital.
we question because we want to learn.
otherwise we would just be making uneducated guesses at ways to properly repair things.
if i remember correctly, the reason for the TSB was that the one way valve could fail allowing air into the fuel filter which allowed the filter to back drain to the tank causing a hard start condition.
by capping off the port and line, you eliminated an air intrusion point to the filter housing.
it was probably one of these TSB's but since i no longer have a subscription to all data i can not read them.
902611 DEC 90 Engine - Hard Starting/Long Cranking Time
89189 SEP 89 Diesel Engine - Idle Surge/Hard/No Start
88209 SEP 88 Engine - No Start or Hard Start Condition
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
A vacuum cap at injector cap with spring clamp. That's basically what came in my line kit from conestoga.
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
It's a spring check valve to keep back pressure on filter to bleed air out. There's a flow restriction orifice in the end of the barb to limit flow. The check is designed to prevent flow from the return line into it. The spring is around 1psi at my best guess. Its similar to a ball point pen spring. The check ball appears to be PVDF/Kynar, the seat in the filter head is ground into the aluminum housing.
I'm not going to pull the one on my parts truck, there's no way this valve could be assembled backwards because the spring would pass through the check ball seat and into the filter head.
I'm not going to pull the one on my parts truck, there's no way this valve could be assembled backwards because the spring would pass through the check ball seat and into the filter head.
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
Unless they used and oversized spring it would have fit through the ball check seat and gone into filter. There's no seat ground into the brass fitting either.
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
1993 factory turbo I have a 94 turbo thats the same too. They both have bottom aluminun plate with sensors on filter.
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Freshman User
Joined: Mar 2016
Posts: 45
Likes: 0
My 7.3 has a smaller fitting it's the first 7.3 idi, and doesn't have an orifice like that, looks just like a barb
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Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
I would just pull your fittings and look at them to see what they look like. I dont see how the injector caps would have enough pressure to overcome the incoming filter pressure with an open return line leading to the tank.
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Freshman User
Joined: Mar 2016
Posts: 45
Likes: 0
So the filter was full, but that **** was stuck on there, don't know when it was last changed, what's the best filter for these? Price isn't that big of an issue my dad always changes his every third oil change or right before a long trip and never had problems. I have access to to wix, and a Donaldson dealer if they make one that fits
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