Need help with Fuel System upgrades
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Junior User
Joined: Sep 2010
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From: Summerville SC
Need help with Fuel System upgrades
Ok i have been told about 10 different things to do to prevent low fuel pressure or low fuel quantity to the back cyclinders. dont know which it is i am trying to prevent. So if someone can give me some straight up answers what is it i need to do or buy to make the fuel system the best it can be. I am currently running a mild tune from SCT but of course just like everyone else i want more. But i know it doesnt do any good to upgrade parts if the motor isnt going to get the fuel it needs to run. I am open to any suggestions but i would like to do this is my driveway if possible But i still want to do it right. so if anyone has part suggestions or anything please fire away thank you for your help.
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Junior User
Joined: Sep 2010
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From: Summerville SC
No fuel pressure gauge installed yet. I havent done anything with the fuel system yet. I dont want to do something and then have to redo it because of something i might have to change.
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Junior User
Joined: Sep 2010
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From: Summerville SC
What is this return system people talk about? Something about making the back cylinders recieve the same amount of fuel as the rest? i am not for sure about it but i have heard that it helps alot. I have also been told to install a Fuel pressure regulator but dont know what to do. I have plans of adding bigger injectors and bigger turbo but like i stated before i need to make sure i can supply enough fuel to support any upgrades.
Fleet Owner
Joined: Nov 2003
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Fuel pressures under 45 psig will ruin injectors. If you don't measure the pressure, you don't know where you are at.
The return regulated system system is just that. It connects to the ends of the fuel rails and takes flow back to the pump suction (or the tank). IMO, you don't need it until you get bigger injectors, but others may feel differently.
"Dead-heading" at the fuel rails isn't an issue (IMO) if you have enough fuel supply and pressure to the back injectors. 50-70 psig fuel pressure (measured at the test port) at WOT and you will be fine w/ a stock system - without the return regulated system. Bigger injectors and high hp tunes, and you will need a FASS or an AirDog set-up, and maybe would benefit from the return regulated system. Just be aware that it is a little tricky to set all that up - at least w/ the FASS (from what I hear).
The return regulated system system is just that. It connects to the ends of the fuel rails and takes flow back to the pump suction (or the tank). IMO, you don't need it until you get bigger injectors, but others may feel differently.
"Dead-heading" at the fuel rails isn't an issue (IMO) if you have enough fuel supply and pressure to the back injectors. 50-70 psig fuel pressure (measured at the test port) at WOT and you will be fine w/ a stock system - without the return regulated system. Bigger injectors and high hp tunes, and you will need a FASS or an AirDog set-up, and maybe would benefit from the return regulated system. Just be aware that it is a little tricky to set all that up - at least w/ the FASS (from what I hear).
Posting Guru
Joined: Oct 2010
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From: Kerrville, Tx
i have a regulated return and airdog. personally i will run the regulated return on all my trucks because of how much it helps the back injectors and prevents alot of problems. also alot of guys run the blue spring kit. either way you choose isnt bad at all. if you want bigger injectors in the future do the reg. return. i love mine! but i also run a race tune with stock pump on my brothers truck with a RR and his pressure drops maybe 1-2psi at WOT so IMO if you want a fuel system get the RR and just use the stock pump until you get injectors because getting an airdog and RR to work together is kinda difficult but can be done
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Fleet Owner
Joined: Nov 2003
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i have a regulated return and airdog. personally i will run the regulated return on all my trucks because of how much it helps the back injectors and prevents alot of problems. also alot of guys run the blue spring kit. either way you choose isnt bad at all. if you want bigger injectors in the future do the reg. return. i love mine! but i also run a race tune with stock pump on my brothers truck with a RR and his pressure drops maybe 1-2psi at WOT so IMO if you want a fuel system get the RR and just use the stock pump until you get injectors because getting an airdog and RR to work together is kinda difficult but can be done
I agree, it sounds better, but if the pressure drop in the fuel rail is minimal, the back injectors will get plenty of fuel and pressure.
I do agree that at SOME fuel flow rate, you would benefit from it, but ONLY if you have enough pressure to overcome the losses from the increased (recirculation) flow.
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Posting Guru
Joined: Oct 2010
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From: Kerrville, Tx
for me its just more of a prevention and i feel better part. for me if i can spend 600 and save the back injectors or atleast have peace of mind about them then it makes me happy knowing that i might have saved 500 just in two injectors plus the frustration of getting to the #8 injector
Fleet Owner
Joined: Nov 2003
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for me its just more of a prevention and i feel better part. for me if i can spend 600 and save the back injectors or atleast have peace of mind about them then it makes me happy knowing that i might have saved 500 just in two injectors plus the frustration of getting to the #8 injector
Post Fiend
Joined: Oct 2009
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From: N. Fort Worth, tx
for me its just more of a prevention and i feel better part. for me if i can spend 600 and save the back injectors or atleast have peace of mind about them then it makes me happy knowing that i might have saved 500 just in two injectors plus the frustration of getting to the #8 injector
the system splits off to each head (one of the reason for that little check valve everyone wants to get rid of). all fuel send to each head is used. the return is only for excess fuel in the fuel bowl.
I strongly advise not to join the heads together at the back of the engine either. the reason for this that if you do somehow wind up with low pressure to one head you can reduce pressure to the other bank. also if you have an injector that is leaking exhaust gasses you stand the chance of distroying all 8.
Posting Guru
Joined: Oct 2010
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From: Kerrville, Tx
no mine arent joined i never did like the idea of the crossover line. some of it is peace of mind and some of it was i was going to do injectors before i decided to sell the dually and keep this SRW. also i did it while the studs were being done so i was right there and it was easy to put in
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