Fuel tank crossover Delete/Question
Thread Starter
Instructor
Joined: Nov 2016
Posts: 199
Likes: 23
From: Irvine California
Fuel tank crossover Delete/Question
Hey guys I am about to tackle the dreaded fuel system on my C6 Z06. I got a Fore innovations L2 Dual 450 Kit that I will be installing soon. I have been doing my due diligence and as much research as I can on the process so I can have an understanding on the functionality of the cross over tube and how the system works. one thing that i noticed and wondered on was has anyone ever eliminated the tank crossover? In its place have braided line with ether -6 AN fittings or 3/8" quick connects in the middle of the two tanks? Unless I am misunderstanding the function of the crossover tube, the small plastic lines inside the crossover do all the work and the outer tube is just for protection/support, or is there another function I missed. Don't the tanks get all their support from the metal trays underneath?
Anyone have any thoughts on this?
I apologize if this has been attempted in the past and failed and I missed that thread.
Anyone have any thoughts on this?
I apologize if this has been attempted in the past and failed and I missed that thread.
Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 807
From: West coast CA
Hey guys I am about to tackle the dreaded fuel system on my C6 Z06. I got a Fore innovations L2 Dual 450 Kit that I will be installing soon. I have been doing my due diligence and as much research as I can on the process so I can have an understanding on the functionality of the cross over tube and how the system works. one thing that i noticed and wondered on was has anyone ever eliminated the tank crossover? In its place have braided line with ether -6 AN fittings or 3/8" quick connects in the middle of the two tanks? Unless I am misunderstanding the function of the crossover tube, the small plastic lines inside the crossover do all the work and the outer tube is just for protection/support, or is there another function I missed. Don't the tanks get all their support from the metal trays underneath?
Anyone have any thoughts on this?
I apologize if this has been attempted in the past and failed and I missed that thread.
Anyone have any thoughts on this?
I apologize if this has been attempted in the past and failed and I missed that thread.
When you fill up the car, fuel pours into the left tank. Eventually it overflows into the crossover tube and pours into the right tank.
(Remember, during fill-up the fuel pump is off. None of the internal transfer lines are doing anything.)
Similarly, fuel vapor from both tanks is contained at the top of this single 3-piece assembly. That's why there's only one EVAP system (which happens to be on the right).
Note also that when the fuel pump is running, excess fuel transferred under pressure from right to left will continue to spill back through the crossover tube.
Thread Starter
Instructor
Joined: Nov 2016
Posts: 199
Likes: 23
From: Irvine California
Think of the car as having a single fuel storage chamber consisting of three parts: 1) the left tank, the 2) right tank, and 3) the crossover tube. Each part is open to the other. Together they form one liquid-tight pressure vessel. It's like a single tank with two pickups.
When you fill up the car, fuel pours into the left tank. Eventually it overflows into the crossover tube and pours into the right tank.
(Remember, during fill-up the fuel pump is off. None of the internal transfer lines are doing anything.)
Similarly, fuel vapor from both tanks is contained at the top of this single 3-piece assembly. That's why there's only one EVAP system (which happens to be on the right).
Note also that when the fuel pump is running, excess fuel transferred under pressure from right to left will continue to spill back through the crossover tube.
When you fill up the car, fuel pours into the left tank. Eventually it overflows into the crossover tube and pours into the right tank.
(Remember, during fill-up the fuel pump is off. None of the internal transfer lines are doing anything.)
Similarly, fuel vapor from both tanks is contained at the top of this single 3-piece assembly. That's why there's only one EVAP system (which happens to be on the right).
Note also that when the fuel pump is running, excess fuel transferred under pressure from right to left will continue to spill back through the crossover tube.
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
To add, the way that the fuel pumps works, if you have a mechanical pump in the drivers side, which sends pressure over to the venture pump in the passengers side to pull the fuel out of that tank first.
So not only is the cross over tube used to fill both tanks, but a passage void for the fuel lines to drive the passive venture pump in the passenger tank, and send it back to the mech pump in the drivers tank, to send the fuel to the rail.
https://www.corvetteactioncenter.com...ystem-389.html
So not only is the cross over tube used to fill both tanks, but a passage void for the fuel lines to drive the passive venture pump in the passenger tank, and send it back to the mech pump in the drivers tank, to send the fuel to the rail.
https://www.corvetteactioncenter.com...ystem-389.html
Race Director
Joined: Sep 1999
Posts: 12,435
Likes: 918
From: CONCORD NC
Some photos to help visualize, the big tube (Tee’d in my case for faster fills) links the 2 tanks, and the 2 small lines handle return and crossover . The c5 had these lines exterior to the tanks
i cut out an access panel
