Fuel Bleeding Off
Thread Starter
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Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
Fuel Bleeding Off
From secondary filter.....
This may be self inflicted... A few weeks back I changed the fuel filters and cleaned the water separater and replaced the gasket. Since then I’ve periodically feel like I have an injector acting up, running rough at idle. Today I had 2 misfires show up on my Dashboss...This evening I let the truck cool down for about 30 min, pulled the secondary fuel filter cap off to find very little fuel in the housing.
Not making oil and not smoking... Could I have damaged something at the HFCM causing it to bleed off on the return side. Seems coincidental that the rough idle started after the filter change...
Edit.... After inspecting the main filter and orings, I filled the secondary housing back up and spun the engine over using the passenger side wire and didn’t see any bubbles.
This may be self inflicted... A few weeks back I changed the fuel filters and cleaned the water separater and replaced the gasket. Since then I’ve periodically feel like I have an injector acting up, running rough at idle. Today I had 2 misfires show up on my Dashboss...This evening I let the truck cool down for about 30 min, pulled the secondary fuel filter cap off to find very little fuel in the housing.
Not making oil and not smoking... Could I have damaged something at the HFCM causing it to bleed off on the return side. Seems coincidental that the rough idle started after the filter change...
Edit.... After inspecting the main filter and orings, I filled the secondary housing back up and spun the engine over using the passenger side wire and didn’t see any bubbles.
Thread Starter
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Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
My freakin transducer is bad on my FP sensor. I don’t have any other way to check...
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
Well, I guess at any rate it's still possible the o ring on the primary filter is the culprit. It's happened before.
Thread Starter
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Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
Hey Benny. Yes it was up to temp. What are the likely culprits if it fails at temp? I’m sitting down.... 
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Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
If your getting any air into the system it will also cause some missing. I have the drain plug pinch the O-ring and was doing some odd miss
at speed. I thought it was a bad injector. I put one in the later that day found the rainbow after some water got on the driveway. I got to looking
and it turned out to be that O-ring.
at speed. I thought it was a bad injector. I put one in the later that day found the rainbow after some water got on the driveway. I got to looking
and it turned out to be that O-ring.
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Thread Starter
|
Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
If your getting any air into the system it will also cause some missing. I have the drain plug pinch the O-ring and was doing some odd miss
at speed. I thought it was a bad injector. I put one in the later that day found the rainbow after some water got on the driveway. I got to looking
and it turned out to be that O-ring.
at speed. I thought it was a bad injector. I put one in the later that day found the rainbow after some water got on the driveway. I got to looking
and it turned out to be that O-ring.
I put my spare pump in and retested with no change. I pull the drivers side fuel line off, filled the housing with fuel, pressed my finger over the hole and it still drained off... I ran out of light so I’ll test the passenger side and FP port tomorrow evening. No visible leaking that I can see....
At the rate it is bleeding off I should be making some serious oil or coolant. Smoking like a freight train? Non of that...
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Could it be going back to the tank?
If you still have the return line on the secondary filter it could be.
What you need to make is a tool that lets you block both the feed and
return lines heading up to the secondary filter. Then fill the bowl and see
if it holds.
Do you have any broken covers that you could hack up and use the two pipes
that lock into the lines heading up to the engine?
If you still have the return line on the secondary filter it could be.
What you need to make is a tool that lets you block both the feed and
return lines heading up to the secondary filter. Then fill the bowl and see
if it holds.
Do you have any broken covers that you could hack up and use the two pipes
that lock into the lines heading up to the engine?
Hotshot
Joined: Dec 2014
Posts: 17,828
Likes: 3,113
From: Jersey Shore
So if I may review (not trying to be the *** some may see me as).
Conclusions
Some here who I consider being excellent mechanics and diagnosticians have had issues with this o-ring. Maybe a little more care, lubrication on install or just routine change-out of this ring may be necessary, depending on the source of the multitude of o-ring piston blue spring failures the community has seen.
- Poor running motor.
- A quick drain of the fuel filter reservoir.
- No fuel pressure reading because the sensor failed.
- Misdirections and HFCM pump change SWAG did not fix the issue.
- Failure was an o-ring of the pressure regulator, part of the blue spring kit.
- Concern over injector damage due to unknown fuel pressure.
Conclusions
- An operating fuel pressure gauge is an essential part of the operational monitoring of a 6.0. Every truck needs to have one and it is imperative to fix any that are not working correctly.
- Changing out the fuel pressure regulator has potential issues, both potentially with the assembly method and source of the product (unknown).
- Fuel pressure o-rings may have a service life, depending on the source: assembly line; Motorcraft; or aftermarket.
- Key tell without a fuel pressure gauge was the fuel draining out of the fuel filter reservoir quickly.
Some here who I consider being excellent mechanics and diagnosticians have had issues with this o-ring. Maybe a little more care, lubrication on install or just routine change-out of this ring may be necessary, depending on the source of the multitude of o-ring piston blue spring failures the community has seen.
Thread Starter
|
Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
So if I may review (not trying to be the *** some may see me as).
Conclusions
Some here who I consider being excellent mechanics and diagnosticians have had issues with this o-ring. Maybe a little more care, lubrication on install or just routine change-out of this ring may be necessary, depending on the source of the multitude of o-ring piston blue spring failures the community has seen.
- Poor running motor.
- Correct
- A quick drain of the fuel filter reservoir.
- Correct
- No fuel pressure reading because the sensor failed.
- That or it wasn’t building pressure. I remove the sensor and installed a new plug to remove this from the equation. This was a Dashboss kit, which I will be transitioning to a pillar mount gauge soon.
- Misdirections and HFCM pump change SWAG did not fix the issue.
- The symptoms arose AFTER I performed a routine 10k filter change. I assumed that I caused the issue some how. I have an extra HFCM so, I took a SWAG, yes.
- Failure was an o-ring of the pressure regulator, part of the blue spring kit.
- I installed the Motorcraft blue spring kit back in 2016. Pretty straight forward to replace.
- Concern over injector damage due to unknown fuel pressure.
- Yep
Conclusions
- An operating fuel pressure gauge is an essential part of the operational monitoring of a 6.0. Every truck needs to have one and it is imperative to fix any that are not working correctly.
- Agreed
- Changing out the fuel pressure regulator has potential issues, both potentially with the assembly method and source of the product (unknown).
- Motorcraft, installed by me in 2016. I’ve installed them on 3 different trucks and this is the first time I’ve had an issue. Could I have damaged it, it is possible.
- Fuel pressure o-rings may have a service life, depending on the source: assembly line; Motorcraft; or aftermarket.
- Agreed.
- Key tell without a fuel pressure gauge was the fuel draining out of the fuel filter reservoir quickly.
Some here who I consider being excellent mechanics and diagnosticians have had issues with this o-ring. Maybe a little more care, lubrication on install or just routine change-out of this ring may be necessary, depending on the source of the multitude of o-ring piston blue spring failures the community has seen.