For Dahl 100 users
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Tuned
Joined: Feb 2007
Posts: 461
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For Dahl 100 users
For you guys with the Dahl 100 fuel filter, what does your vacuum guage at the filter read?
I just installed my Dahl unit and I am reading -11 on the guage. Some that I have mentioned this to say that seems high?
What reading should I expect as the filter becomes restricted enough to affect fuel flow? I'd hate to burn up the pump.
I just installed my Dahl unit and I am reading -11 on the guage. Some that I have mentioned this to say that seems high?
What reading should I expect as the filter becomes restricted enough to affect fuel flow? I'd hate to burn up the pump.
Logistics Pro
Joined: Aug 2005
Posts: 3,884
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From: Morgan Hill, CA
Hang on. Have you done the in-tank mods and ditched the screen in there? That *might* be the reason for it being high if it's still in there. I have removed mine and have just a tube for fuel intake.
What does the fuel pump sound like when you turn the key on but not start it? If you hear a buzzing or bubbling sound, your pump is yelling at you to find the restriction. That is what prompted me to check my gauge and see it was clogged. It took over a year to clog the filter to that point.
What does the fuel pump sound like when you turn the key on but not start it? If you hear a buzzing or bubbling sound, your pump is yelling at you to find the restriction. That is what prompted me to check my gauge and see it was clogged. It took over a year to clog the filter to that point.
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Tuned
Joined: Feb 2007
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I have not done the in tank mods yet. I'm trying to get someone that is close by with a little more faith in their mechanical abilties than I have in mine to help me drop the tank.
Sitting in the cab, after having purged the air from the filter, I have not heard anything noticable with the pump. Maybe I'll lay down there while I have someone else cycle the key.
If my pump is dealing with restriction, in addition to sound wouldn't I feel it with lack of acceleration?
Sitting in the cab, after having purged the air from the filter, I have not heard anything noticable with the pump. Maybe I'll lay down there while I have someone else cycle the key.
If my pump is dealing with restriction, in addition to sound wouldn't I feel it with lack of acceleration?
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Tuned
Joined: Feb 2007
Posts: 461
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I removed the Dahl from the fuel line and the guage now reads -8. That still seems higher than what you guys are reporting. I'm wondering if I should just continue to run the filter as is and see what happens or what?
I'm starting to regret this measure that I took in an effort to ensure the quality of my fuel.
I'm starting to regret this measure that I took in an effort to ensure the quality of my fuel.
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Post Fiend
Joined: Jul 2005
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From: 21791
I know this may just be a band-aid fix for a high restriction in the system, but adding a lift pump between the filter and the main pump will help greatly on extending the main pump's life. It really hurt's it's efficiency when you have that restriction in the system and the pump has to pull the fuel and then push it as well. The lift pump running 5-7psi of pressure will pull fuel from the tank, through the filter, and then send it on it's way to the main pump. I have a Carter 4070, but the only disadvantage is that it is extremely loud compared to the stock pump. It is about $60 and i think it's worth it.
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
I just had a Racor installed, and it came with their recommended 30 micron element on the suction side. They also make 2 and 10 micron elements that fit my adaptor, but claim they should only be used on the pressure side of the OEM pump. I'm wondering if the smaller micron filters cause too much restriction when used on the suction side?
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by John311t
You can use a lift pump so that on the suction side you can use the 2 micron filter IIRC. Thats my next mod.
https://www.ford-trucks.com/forums/585815-possible-new-fuel-mod-for-air-separation.html
That would make a total of 3 filters for the OEM pump to flow, and maybe that's too much total restriction?
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Tuned
Joined: Feb 2007
Posts: 461
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Thanks for the suggestions
I live in Vero Beach, FL.
I blew some compressed air through the fuel lines and back into the tank, thinking that maybe the tank strainer may be obstructed. I hooked the Dahl unit back up and started up the truck.
Where I was reading -11, I am now reading -8. It stands to reason that if I removed the Dahl unit at this point I would read -4. So things are better, but still not great
I guess I need to plan on dropping the tank and doing the Hutch Mod? Anybody close by feel like heping me out with that task?
If that still does not remedy the situation I guess I will be looking for a lift pump. My wife will love to hear that I have to spend yet more money and time for what was suppossed to be a simple up-grade.
I read that I want a pump that pushes out 5-7 PSI and I saw the recommnedation of the Carter pump. Any other LOW cost suggestions?
I blew some compressed air through the fuel lines and back into the tank, thinking that maybe the tank strainer may be obstructed. I hooked the Dahl unit back up and started up the truck.
Where I was reading -11, I am now reading -8. It stands to reason that if I removed the Dahl unit at this point I would read -4. So things are better, but still not great
I guess I need to plan on dropping the tank and doing the Hutch Mod? Anybody close by feel like heping me out with that task?
If that still does not remedy the situation I guess I will be looking for a lift pump. My wife will love to hear that I have to spend yet more money and time for what was suppossed to be a simple up-grade.
I read that I want a pump that pushes out 5-7 PSI and I saw the recommnedation of the Carter pump. Any other LOW cost suggestions?
Postmaster
Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
Originally Posted by firemediceric
I blew some compressed air through the fuel lines and back into the tank, thinking that maybe the tank strainer may be obstructed. I hooked the Dahl unit back up and started up the truck.
Where I was reading -11, I am now reading -8. It stands to reason that if I removed the Dahl unit at this point I would read -4. So things are better, but still not great.
Where I was reading -11, I am now reading -8. It stands to reason that if I removed the Dahl unit at this point I would read -4. So things are better, but still not great.
Thread Starter
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Tuned
Joined: Feb 2007
Posts: 461
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I dropped the tank, I did the Hutch and Harpoon mods. The screens both on the foot and in the mixing chamber were VERY clogged.
I got new 3/8" fuel line run and everything is back together. The truck seems to be running well and the Vacuum guage after the Dahl is now reading -4.
Had I never purchased the vac guage from Bob, I would have never known about this problem until I went through several pumps . As it is, who knows how long I've been dealing with this restriction and placing a strain on the pump.
Eric
I got new 3/8" fuel line run and everything is back together. The truck seems to be running well and the Vacuum guage after the Dahl is now reading -4.
Had I never purchased the vac guage from Bob, I would have never known about this problem until I went through several pumps . As it is, who knows how long I've been dealing with this restriction and placing a strain on the pump.
Eric