Flipping the Switch: Custom Electric Fuel Pump Wiring on the Meano Camino
When you are updating an older car or truck with an electric fuel pump, there is a standard way to wire things up. Ideally, you run your remote power signal straight into an accessory fuse on the block. That way, when you turn the key halfway, the pump clicks on automatically, primes the line, and you don’t have to think about it.
But where is the fun in doing things the standard way?
If you are like me, you’ve always looked at custom race cars or vintage project builds and wanted those cool, tactile toggle switches on the dash. There is just something incredibly satisfying about flipping a physical switch to bring a mechanical beast to life before you ever twist the key. Cross that one off the bucket list! For our 1980 El Camino project—the "Meano Camino"—we decided to skip the basic fuse tap, have a little fun with the cockpit layout, and install a dedicated fuel pump toggle switch.
Check out the full step-by-step wiring chaos and the exact moment the pump primed in the video below:
The Strategy: Safety, Relays, and Proper Placement
Before you start stringing hot wires across your interior, electric fuel pumps require a clean layout to avoid burning up the pump motor or, worse, your electrical harness.
Ideally, you want an electric fuel pump mounted roughly 12 inches away from the fuel tank, set lower than the tank body, and angled specifically to keep it constantly fed. Since this system is serving as our temporary fuel testing setup before we ultimately drop a 5.3L Vortec engine into this chassis, we bolted it up in a solid, convenient spot on the frame to see how long it lasts.
More importantly, never run heavy fuel pump power directly through a dashboard switch. Instead, use the switch to trigger a relay. We mounted a dedicated relay alongside an inline circuit breaker under the hood for maximum safety.
If you want to grab the exact same gear we used to tackle this swap, we’ve gathered the full parts list below:
(Full disclosure: we do get a little bit of a kickback when you use or go through our links—we truly appreciate your support! It helps us buy the tools and parts needed to keep these garage projects rolling.)
The Workbench Prep: Tools Required
To map out this clean, relay-triggered circuit, clear your space and grab these essential electrical tools:
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Step Drill Bit & Hand Drill: For punching a clean path through the interior firewall paneling and drilling out your custom dash switch mounting hole.
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Wire Strippers & Crimpers: For prepping your connections.
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Insulated Ring and Spade Terminals: To secure your leads to the breaker, ground, and switch terminals.
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Electrical Tape & Zip Ties: To clean up the harness run and keep hot wires off hot exhaust pipes.
Step-by-Step Wiring Guide
1. Mount the Heavy Hardware
With the fuel pump bolted securely to the frame, move under the hood to mount your safety components. Find a flat, clean spot on the inner fender wall and screw down your relay block and your inline safety circuit breaker. Make sure they are mounted tightly so they won't rattle loose under vibration.
Here is where we put the safety circuit breaker:
This is the relay:
2. Terminate Your Grounds and Power Leads
Time to wire up the relay. Connect the black ground wire from your relay harness directly to a clean chassis ground.
There was already a ground wire location; we just added this ground to it, as seen below:
Next, run the heavy-gauge red wire over to the circuit breaker, and bridge the opposite side of the breaker directly to the positive terminal of your battery.
This image shows the red wire running from the relay to the breaker:
Next, run a wire from the other side of the breaker to the positive terminal on the battery. Please note that ours is black for some reason, but it is hooked up to the positive side of the battery. There was also a small lead coming off the connector that we just spliced into, as seen below:
Finally, hook up the purple load wire from your relay down to the positive terminal of the fuel pump, ensuring the pump's independent ground is securely attached to the frame.
This is the fuel pump ground going to the same ground location we used previously in this wiring:
3. Punch Through the Firewall
To get control inside the cab, you need to bring your trigger wire inside. Drill a small pilot hole through an open section of the firewall using a step bit, making sure you clear any structural components or interior carpet. Push your yellow trigger wire through the hole and route it cleanly along the underside of the dashboard layout.
4. Drill and Mount the Switch
Pick the perfect spot on your dash trim panel for your new cockpit switch. Drill out the mounting hole, insert the toggle switch assembly from behind, and secure it with the trim nut.
Crimp your wire leads onto the spade terminals on the back of the switch, grounding one side and connecting your firewall trigger wire to the opposite terminal.
(Why run two individual wires when you can just run one 2-conductor wire?)
It might be easier to watch the video to see the wiring for this section. I will add a link below that will take you right to this part of the install! 😊
5. Flip the Switch and Test
With everything connected, pop the hood breaker back into the "on" position. Go into the cab and flip your brand-new toggle switch. You should immediately hear the distinct hum of the electric fuel pump priming the line.
🛠️ Stuck on your electrical layout? Wiring up custom automotive relays can look like a bowl of spaghetti if you aren't careful. If you're currently trying to map out a custom toggle switch setup or fighting a bad ground on your own build, leave a comment down below! Tell us what your wiring diagram looks like, and the community can help you trace it down.
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