Hutch/Harpoon mod
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More Turbo
Joined: Aug 2002
Posts: 583
Likes: 46
From: Utah
Hutch/Harpoon mod
Could someone please explain to me how these mod's possibly help keep air out of the fuel? I have read Guzzle's page and millions of threads. I see it only affecting how much usable fuel can be in the tank. I dont see how it prevents air in the fuel.
Laughing Gas
Joined: Jan 2015
Posts: 820
Likes: 3
From: Central OK
Hutch mod: The return line is moved away from the pickup, theoretically preventing more air in the fuel at lower tank levels from the return sloshing fuel about. That's about all.
Harpoon just lets you fill up easier.
Harpoon just lets you fill up easier.
Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
It is also an opportunity to get replace the fuel quick connects which are intended for a pressurized fuel system, not one under vacuum like ours. The connections between the fuel pump and the tank can draw air.
Fleet Mechanic
Joined: Jul 2005
Posts: 1,800
Likes: 52
From: Southern Colorado
I can tell you this: While the truck was running, I attached clear fuel line to the bowl drain, and opened the bowl drain valve. Before I did the hutch mod, the draining fuel was clearly full of bubbles. After I did the hutch mod, the fuel was clear. Also, after the mod, the truck was quieter upon starting it.
I was as skeptical as you, but Ford's engineering of the fuel system was very unimpressive. I did replace the clamps all along the fuel line, too, as well as doing the in-tank mods.
I was as skeptical as you, but Ford's engineering of the fuel system was very unimpressive. I did replace the clamps all along the fuel line, too, as well as doing the in-tank mods.
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More Turbo
Joined: Aug 2002
Posts: 583
Likes: 46
From: Utah
I didnt think about moving the pickup away from the return. I was just thinking about how it is extended.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Gassers have the fuel pump submerged in the fuel, and the fuel is pressurized all the way from inside the tank to the engine.
Diesels have the fuel pump on the frame rail, so the part of the fuel system before the pump is all "suction".
Ford didn't change the fittings design between the two types of fuel, and a wise old gent in Agusta, Georgia, "hutchinagusta", found that the fittings don't seal equally-as-well in the suction mode, and will allow some air past the fittings. You don't have leaks because air is going IN to the fuel lines, fuel is not coming OUT.
Suction. Kaa-peesh?
Pop
Diesels have the fuel pump on the frame rail, so the part of the fuel system before the pump is all "suction".
Ford didn't change the fittings design between the two types of fuel, and a wise old gent in Agusta, Georgia, "hutchinagusta", found that the fittings don't seal equally-as-well in the suction mode, and will allow some air past the fittings. You don't have leaks because air is going IN to the fuel lines, fuel is not coming OUT.
Suction. Kaa-peesh?
Pop
Posting Guru
Joined: Oct 2012
Posts: 1,910
Likes: 2
From: Hat Creek Ca
If the connectors let air in, wouldnt they also let fuel out? I dont have any leaks.
The connectors on the suction side of the fuel pump are under a vacuum, so they suck air in, therefore no fuel out. If they were loose enough to leak just sitting there would be a real problem. Don't know about the pressure side but as mentioned they are designed to be under pressure.
Pop beat me to it while I was typing - again.
The connectors on the suction side of the fuel pump are under a vacuum, so they suck air in, therefore no fuel out. If they were loose enough to leak just sitting there would be a real problem. Don't know about the pressure side but as mentioned they are designed to be under pressure.
Pop beat me to it while I was typing - again.
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Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
It's the way the seal in the connector functions, sort of like a one way valve, if you will, for lack of a better explanation. Pressurized, it pushes the seal the way it was intended to work, but under vacuum, it pulls the seal in away from the seals mating surface, potentially allowing air to enter. Someone can correct me if I'm wrong, but I believe these fuel line connectors were designed for a gasser where the fuel is pushed through the lines under pressure.
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More Turbo
Joined: Aug 2002
Posts: 583
Likes: 46
From: Utah
It's the way the seal in the connector functions, sort of like a one way valve, if you will, for lack of a better explanation. Pressurized, it pushes the seal the way it was intended to work, but under vacuum, it pulls the seal in away from the seals mating surface, potentially allowing air to enter. Someone can correct me if I'm wrong, but I believe these fuel line connectors were designed for a gasser where the fuel is pushed through the lines under pressure.
That makes more sense. Thank you for explaining to me how the seals actually work and why they will work for pressurized systems and not suction. I think that is what the others were trying to do.
That makes more sense. Thank you for explaining to me how the seals actually work and why they will work for pressurized systems and not suction. I think that is what the others were trying to do.
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