First EFI Swap - How Is the Fuel Pump Wired?

[AU Doc]

I'm working on an LS swap for my 69 camaro. I was planning to get my new Tanks Inc tank installed this weekend, but I realized I'm not sure how the pump will get wired up. I haven't put the engine in yet so I don't know where the relay panel will be.

I know the pump has to have power and ground, and I'm guessing this generally goes through an ECM controlled relay. My car has a trunk mounted battery, so will I put the fuel pump relay in the trunk? Should I just plan to run the power wire from the front of the car to the tank? I'm probably over thinking this, but wanted to get a plan before I start drilling more holes in my car to run the wires.

Also, it looks like the pump that came with the Tanks Inc. tank will draw a max of 17 A, so I'm planning to run a 12 AWG wire to the pump unless someone suggests a larger wire (looks like a 14 is good for somewhere between 15 and 20 A, so a 12 should give me some margin).



Thanks in advance!

[Jketron]

I'm working on an LS swap for my 69 camaro. I was planning to get my new Tanks Inc tank installed this weekend, but I realized I'm not sure how the pump will get wired up. I haven't put the engine in yet so I don't know where the relay panel will be.

I know the pump has to have power and ground, and I'm guessing this generally goes through an ECM controlled relay. My car has a trunk mounted battery, so will I put the fuel pump relay in the trunk? Should I just plan to run the power wire from the front of the car to the tank? I'm probably over thinking this, but wanted to get a plan before I start drilling more holes in my car to run the wires.

Also, it looks like the pump that came with the Tanks Inc. tank will draw a max of 17 A, so I'm planning to run a 12 AWG wire to the pump unless someone suggests a larger wire (looks like a 14 is good for somewhere between 15 and 20 A, so a 12 should give me some margin).

Thanks in advance!

The ecu will controll the relay. Wire your pump ground to the frame and of course make sure the ground is good not only at the fuel pump ground location but also the battery ground to the frame and so on. I ground mine to the frame. The 12 AWG is fine and you will run that to your fuel relay. You can put the relay where you see best.

[SSLOW6.0]

I always like a safety factor on long distance high draw wires. It wont hurt to run 10 AWG wire as your pump power source.

[AU Doc]

Putting the fuel pump relay in the back seems to make the most sense. That would make the power wire very short to limit voltage drop. I just don't recall seeing any pictures of fuel pump relays in anyone's trunk. I haven't really been looking, so I may very well have missed it.

[SSLOW6.0]

Putting the fuel pump relay in the back seems to make the most sense. That would make the power wire very short to limit voltage drop. I just don't recall seeing any pictures of fuel pump relays in anyone's trunk. I haven't really been looking, so I may very well have missed it.

I took a watertight relay and stuffed it under my rear valance/bumper.

[gbledsoe3]

I plan on putting one in the trunk as well.

[MuscleRodz]

A lot of your stand alone efi harnesses have a fuel pump relay built into their kits so all you have to do is run power to the relay and power from the relay to your pump.

[andrewb70]

I run my fuel pump relay in the trunk and power it directly from the battery, which is also in the trunk.

Andrew

[AU Doc]

Thanks for all the info! I missed these replies, somehow. I think I may need to go ahead and decide on a harness, and maybe even go ahead and put the motor in. That'll take a lot of the guesswork out of where everything is going to be.