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Old 08-09-2013, 09:16 AM
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How non-regulated return fuel system works

I have been reading alot lately about SD 7.3s and 6.0s going to regulated return, well after my diy e-fuel on my OBS i have a moderate understanding of how the fuel system works but what i dont get is how you can NOT have regulated return. Wont the system keep building pressure without a return to the tank? Or do the injectors eat all the fuel or does the fuel pump get shut off when pressure builds?

Am i just ignorant or something? Someone please explaine the difference in regulated return vs non regulated return.
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Old 08-09-2013, 09:34 AM
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Regulated return means that the fuel pressure is regulated on the return line... Some guys choose to regulate their fuel pressure before the injectors. All of our trucks still have fuel regulators in them... Ever heard of the blue spring mod on 6.0's?
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Old 08-09-2013, 09:39 AM
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Ahh i see that makes sense i thought the "return" in regulated return was referring to its returning fuel to the tank in general. What are the advantages of regulating before or after the injectors?
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Old 08-09-2013, 09:40 AM
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Non regulated return just sends the extra fuel back to the tank right where its regulated(before the injectors). Only problem is the fuel going back to the tank isn't coming out of the back of the heads so there is a potential that the injectors in the back have a chance of being starved... Plus all air in the fuel system is forced into the heads and gets trapped at the end of the line and has nowhere to go but out thru the injectors. I'm sure someone else will chime in shortly and correct me if I'm wrong plus give more detail into the factory fuel system. I haven't taken mine apart yet but do plan on doing the DIY RR myself.
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Old 08-09-2013, 09:43 AM
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So in order to do a regulated return the heads would have to be drilled/tapped in the back to allow the flow to run straight through?
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Old 08-09-2013, 09:44 AM
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Quote:
Originally Posted by Rammstein1224 View Post
Ahh i see that makes sense i thought the "return" in regulated return was referring to its returning fuel to the tank in general. What are the advantages of regulating before or after the injectors?
I'm pretty sure that fuel regulated after the injectors allows for more fuel when the injectors are at WOT. If you regulate fuel to say 60 psi and then feed 8 injectors there will be a drop in psi. But if fuel is regulated after the injectors the fuel pump does a better job of keeping fuel pressure up while at WOT.
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Old 08-09-2013, 09:46 AM
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Originally Posted by Rammstein1224 View Post
So in order to do a regulated return the heads would have to be drilled/tapped in the back to allow the flow to run straight through?
There is ports on the back of the heads that are just plugged and adding a banjo bolt (or 90* fitting) is all that's needed to get the fuel coming out the back side of the head.
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Old 08-09-2013, 09:49 AM
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Originally Posted by RollinEarly99 View Post
I'm pretty sure that fuel regulated after the injectors allows for more fuel when the injectors are at WOT. If you regulate fuel to say 60 psi and then feed 8 injectors there will be a drop in psi. But if fuel is regulated after the injectors the fuel pump does a better job of keeping fuel pressure up while at WOT.
Yea thats what i would imagine in my head makes more sense, any idea why ford decided to do this in the SD vs the OBS that has regulated return stock? Cheaper?

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Originally Posted by RollinEarly99 View Post
There is ports on the back of the heads that are just plugged and adding a banjo bolt (or 90* fitting) is all that's needed to get the fuel coming out the back side of the head.
Ok i see id imagine its the same on the 7.3 because i think the heads between the OBS and the SD are the same and the OBS has the ports
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Old 08-09-2013, 02:17 PM
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Go to RiffRaff and take a look at their FrX. It's a great alternative to a full-blown RR and accomplishes the same thing for Much less $$ (especially on a Stock Engine)
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Old 08-09-2013, 02:24 PM
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Originally Posted by NoRalPh View Post
Go to RiffRaff and take a look at their FrX. It's a great alternative to a full-blown RR and accomplishes the same thing for Much less $$ (especially on a Stock Engine)
Hell for 180 i could buy a fpr and some frame mounted filters and do a fuel bowl delete all together like i did for my OBS
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