Regulated return question - Ford Powerstroke Diesel Forum
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Old 05-21-2013, 03:49 PM
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Regulated return question

I understand how the system works but I'm wondering how air gets to the fuel rails in the heads if you don't have a leak in your fuel system where does the air come from and is this mod only for trucks with bigger injectors.
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Old 05-21-2013, 04:08 PM
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I see a surprising amount of bubbles coming from my pump. Most of which, I assume, gets collected at the top of the filter housing and sent back to the tank. And then, without the Hutch Mod, gets pulled back into the system from the pick-up.

Ending the "deadhead" has other benefits too though. You get better distribution, cleaning, and maybe best of all, if you ever ran-out it'd be a snap to get going again!
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Old 05-21-2013, 04:14 PM
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Ur saying the air goes out the return line on the filter housing like designed and never gets to the heads what does having a return system from the heads do then if the air is never getting there
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Old 05-21-2013, 04:20 PM
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First off where does any dirt or scale go after the filters?
It will collect in the backs of fuel logs in the heads.
With a regulated return you are controlling pressure and volume after the injectors get fed, rather than regulating pressure from the supply side.
Air can get sucked into the fuel before the pump or at seams in the strainer.
The air will float to the tops of the fuel logs in the head and become trapped.
The only way to get it out is to stand it up on the rear bumper and tap on the oil pan!!
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Old 05-21-2013, 04:30 PM
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So a regulated return won't get the air out of the heads if it gets there it has to go through the injectors?
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Old 05-21-2013, 04:49 PM
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airs introduced from the quick connect fitting, atop the tank / fuel sender. Eliminate that connection with a 3/8 hose from it, to pump, using worm clamps, and you'll wont have an air problem.

Doing all of that, might as well do the Hutch mod. Eliminating the strainers inside the tank, which will eventually clogg up, starving the system of fuel. Install a pre-pump filter and be done with it.

Welcome to guzzle's In-tank Hutch Mod Web Page
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Old 05-21-2013, 04:59 PM
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Im asking about regulated return system r they a Waste of money or are they. Good idea or over kill or un needed
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Old 05-21-2013, 04:59 PM
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I think you're not understanding.
Stock, fuel is in your tank. A pump sucks it out and so there is suction from the tank to the pump. The in tank assembly is known to let in air. Any bubbles from that or pump cavitation then gets pushed to the fuel bowl. There, it either is pushed out the regulator and back to the tank or it is pushed into one fuel rail or the other. There, it has no where to go except injectors.
A RR is the same as stock pre pump. Post pump it goes into the fuel rails first. But fuel flows from one end of the rail to the other, all the way through to a regulator, and then goes back to the tank. So since there is constant pressure, junk and air will usually go where fuel is flowing the fastest towards, and is back to the tank.
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Old 05-21-2013, 05:04 PM
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I get how the air gets to the fuel filter housing, so the ford designed return isn't good enough and doesn't get rid of the air before it sends it to the heads?
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Old 05-21-2013, 05:06 PM
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No. Because if your fuel pressure is low, which it probably is, the injectors are wanting more fuel than the pump can supply. So the majority of the fuel will go to the injectors, air and all. With ample supply, flow, and constant pressure, you help with that.
But ford's isn't designed to get rid of air. It just gets fuel to the injectors.

It's like your exhaust. It was good enough to drive with, but wasn't really best for the motor.
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