Fuel Issue Please Help
Thread Starter
Instructor
Joined: Jun 2011
Posts: 214
Likes: 0
Fuel Issue Please Help
Good afternoon fellas!
I have a 1997 Corvette with the following modifications:
LQ9 6.0L
LS3 Intake
LS3 Fuel Rail
LS3 Heads
LS3 Throttle Body
LS3 Style 72# Injectors
V3 T Trim Blower
114 LSA Cam
UPP Fuel Kit
Kooks Headers
BB Exhaust
The issue I am having, a 1997 C5 fuel rail has a fuel return, the LS3 fuel rail that I am using does not have a return.
I purchased the UPP Fuel Kit to install (a stand alone system that does not mess with the factory fuel system), I believe the 90 degree fitting fits to the schrader valve on the front drivers side of the fuel rail. (see the photo in this thread)
http://forums.corvetteforum.com/c6-f...el-system.html
What are my options? Can I use a fuel filter/regulator out of a 2002 corvette to replace the fuel return from the early C5 rail?
(see photo in post 10)
http://forums.corvetteforum.com/c5-t...m-failure.html
With this said, I have a few questions.
Do I need the fuel return?
If not, can I delete the fuel return and what would it effect?
If I do need the return, could I get a remote fuel pressure regulator and plumb the feed and return using that? If I can do this, what regulator would I have to purchase?
Sorry about the questions, I am new to this.
Thanks!
I have a 1997 Corvette with the following modifications:
LQ9 6.0L
LS3 Intake
LS3 Fuel Rail
LS3 Heads
LS3 Throttle Body
LS3 Style 72# Injectors
V3 T Trim Blower
114 LSA Cam
UPP Fuel Kit
Kooks Headers
BB Exhaust
The issue I am having, a 1997 C5 fuel rail has a fuel return, the LS3 fuel rail that I am using does not have a return.
I purchased the UPP Fuel Kit to install (a stand alone system that does not mess with the factory fuel system), I believe the 90 degree fitting fits to the schrader valve on the front drivers side of the fuel rail. (see the photo in this thread)
http://forums.corvetteforum.com/c6-f...el-system.html
What are my options? Can I use a fuel filter/regulator out of a 2002 corvette to replace the fuel return from the early C5 rail?
(see photo in post 10)
http://forums.corvetteforum.com/c5-t...m-failure.html
With this said, I have a few questions.
Do I need the fuel return?
If not, can I delete the fuel return and what would it effect?
If I do need the return, could I get a remote fuel pressure regulator and plumb the feed and return using that? If I can do this, what regulator would I have to purchase?
Sorry about the questions, I am new to this.
Thanks!
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Good afternoon fellas!
I have a 1997 Corvette with the following modifications:
LQ9 6.0L
LS3 Intake
LS3 Fuel Rail
LS3 Heads
LS3 Throttle Body
LS3 Style 72# Injectors
V3 T Trim Blower
114 LSA Cam
UPP Fuel Kit
Kooks Headers
BB Exhaust
The issue I am having, a 1997 C5 fuel rail has a fuel return, the LS3 fuel rail that I am using does not have a return.
I purchased the UPP Fuel Kit to install (a stand alone system that does not mess with the factory fuel system), I believe the 90 degree fitting fits to the schrader valve on the front drivers side of the fuel rail. (see the photo in this thread)
http://forums.corvetteforum.com/c6-f...el-system.html
What are my options? Can I use a fuel filter/regulator out of a 2002 corvette to replace the fuel return from the early C5 rail?
(see photo in post 10)
http://forums.corvetteforum.com/c5-t...m-failure.html
With this said, I have a few questions.
Do I need the fuel return?
If not, can I delete the fuel return and what would it effect?
If I do need the return, could I get a remote fuel pressure regulator and plumb the feed and return using that? If I can do this, what regulator would I have to purchase?
Sorry about the questions, I am new to this.
Thanks!
I have a 1997 Corvette with the following modifications:
LQ9 6.0L
LS3 Intake
LS3 Fuel Rail
LS3 Heads
LS3 Throttle Body
LS3 Style 72# Injectors
V3 T Trim Blower
114 LSA Cam
UPP Fuel Kit
Kooks Headers
BB Exhaust
The issue I am having, a 1997 C5 fuel rail has a fuel return, the LS3 fuel rail that I am using does not have a return.
I purchased the UPP Fuel Kit to install (a stand alone system that does not mess with the factory fuel system), I believe the 90 degree fitting fits to the schrader valve on the front drivers side of the fuel rail. (see the photo in this thread)
http://forums.corvetteforum.com/c6-f...el-system.html
What are my options? Can I use a fuel filter/regulator out of a 2002 corvette to replace the fuel return from the early C5 rail?
(see photo in post 10)
http://forums.corvetteforum.com/c5-t...m-failure.html
With this said, I have a few questions.
Do I need the fuel return?
If not, can I delete the fuel return and what would it effect?
If I do need the return, could I get a remote fuel pressure regulator and plumb the feed and return using that? If I can do this, what regulator would I have to purchase?
Sorry about the questions, I am new to this.
Thanks!
You can use the factory return and get a EFI connection adapter made by Russell that will plug into your factory return and take it back to the tank. You can locate the regulator where you choose and tee into the fuel pressure circuit where you choose up front to bleed pressure back to the return. I put mine (and many of my customers) inside the driver fender, out of sight and out of the way.
Thread Starter
Instructor
Joined: Jun 2011
Posts: 214
Likes: 0
No you can't delete the fuel return. You don't have to use the factory one but you need one to regulate fuel pressure and you can use an aftermarket EFI regulator. There are many to choose from. If you haven't had the car tuned yet or you have the ability to get your tune tweaked relatively easily, I would recommend buying an EFI regulator with a boost reference port, good to 80psi. I use a Magnafuel, but you can use Aeromotive, Vortech and the list goes on.
You can use the factory return and get a EFI connection adapter made by Russell that will plug into your factory return and take it back to the tank. You can locate the regulator where you choose and tee into the fuel pressure circuit where you choose up front to bleed pressure back to the return. I put mine (and many of my customers) inside the driver fender, out of sight and out of the way.
You can use the factory return and get a EFI connection adapter made by Russell that will plug into your factory return and take it back to the tank. You can locate the regulator where you choose and tee into the fuel pressure circuit where you choose up front to bleed pressure back to the return. I put mine (and many of my customers) inside the driver fender, out of sight and out of the way.
http://www.magnafuel.com/products/ef.../MP-9940-B.htm
Can you email me photos how to install? (Boarderzone457@yahoo.com)
Former Vendor
Joined: Jan 2011
Posts: 1,116
Likes: 39
From: Colorado Springs CO
Just use the regulator that came with the kit. If you're lucky enough to have a 97 that had the fuel return you're starting off great already!
Delete the Aeromotive check valve that came with our kit, this way the stock fuel system can have access to the regulator all the time. Remove the 'T' fitting back by the fuel pump in our system. Run the return from our regulator (the rubber hose) back over to where the stock 97 fuel return was, cut it and attach it to the factory hard line.
Now you're still a return style system, just using our regulator as the return, but still the factory return lines. The walbro in our system already has a check valve, so you shouldn't have to worry about fuel returning backwards through that. AND since now you don't have the stupid in-tank regulator, you can even connect the vacuum to our reg and run it as a true boost referenced system.
CK
Delete the Aeromotive check valve that came with our kit, this way the stock fuel system can have access to the regulator all the time. Remove the 'T' fitting back by the fuel pump in our system. Run the return from our regulator (the rubber hose) back over to where the stock 97 fuel return was, cut it and attach it to the factory hard line.
Now you're still a return style system, just using our regulator as the return, but still the factory return lines. The walbro in our system already has a check valve, so you shouldn't have to worry about fuel returning backwards through that. AND since now you don't have the stupid in-tank regulator, you can even connect the vacuum to our reg and run it as a true boost referenced system.
CK
Thread Starter
Instructor
Joined: Jun 2011
Posts: 214
Likes: 0
Just use the regulator that came with the kit. If you're lucky enough to have a 97 that had the fuel return you're starting off great already!
Delete the Aeromotive check valve that came with our kit, this way the stock fuel system can have access to the regulator all the time. Remove the 'T' fitting back by the fuel pump in our system. Run the return from our regulator (the rubber hose) back over to where the stock 97 fuel return was, cut it and attach it to the factory hard line.
Now you're still a return style system, just using our regulator as the return, but still the factory return lines. The walbro in our system already has a check valve, so you shouldn't have to worry about fuel returning backwards through that. AND since now you don't have the stupid in-tank regulator, you can even connect the vacuum to our reg and run it as a true boost referenced system.
CK
Delete the Aeromotive check valve that came with our kit, this way the stock fuel system can have access to the regulator all the time. Remove the 'T' fitting back by the fuel pump in our system. Run the return from our regulator (the rubber hose) back over to where the stock 97 fuel return was, cut it and attach it to the factory hard line.
Now you're still a return style system, just using our regulator as the return, but still the factory return lines. The walbro in our system already has a check valve, so you shouldn't have to worry about fuel returning backwards through that. AND since now you don't have the stupid in-tank regulator, you can even connect the vacuum to our reg and run it as a true boost referenced system.
CK
Which one is the check valve? Also, are there other fittings I should purchase? I am new to the fuel system game and dont understand it too well.
I really appreciate the response CK!
Former Vendor
Joined: Jan 2011
Posts: 1,116
Likes: 39
From: Colorado Springs CO
YESSSS! I was hoping you would reply to this topic! I tried calling but you guys are closed on Mondays, thank god for Corvetteforum!
Which one is the check valve? Also, are there other fittings I should purchase? I am new to the fuel system game and dont understand it too well.
I really appreciate the response CK!
Which one is the check valve? Also, are there other fittings I should purchase? I am new to the fuel system game and dont understand it too well.
I really appreciate the response CK!
The check valve is the longer black fitting that says Aeromotive on it, it should be connected to the regulator, just pull it out and condense the fittings. The T is in the back with the pump, as well you'll have to remove a dbl female too just to get the fittings to reconnect once the T is gone. I can't remember what the return line was like on the 97's in terms of fittings, but you should be able to just connect the rubber line right to the existing return. Take a pic and post it.
CK
