The other issue that could come to bear is the addition of added electrical draws from a switched key source. Back in the day, our trucks had extra fuse panel outlets for a heater and maybe a radio, but that was about it. Start adding the necessary components for a fuel injection system and you might find yourself without a proper source to draw power, so that is something definitely worth consideration.

Once these two items are sorted out however, it’s fairly straight forward to install the necessary components to get that antiquated carburetor out of the way in favor of a modern fuel injection system.

And speaking of easy, remember the geeks I mentioned earlier? Well, they’ve taken the guess work out of programming a modern EFI system by inventing an ECU that does the guess work for you. Using a handheld programmer, all you have to do is enter a few parameters regarding your particular engine setup and then simply hop in your truck and drive away. Yes, it’s that simple. The ECU takes over from there and learns the necessary driving parameters based on the inputs of the various sensors installed. Using information gathered from the vacuum signal, O2 readings, TPS location, and engine speed, the ECU determines the changes necessary to maintain roughly a 14:1 air/fuel ratio throughout the engine’s load and power band. Pretty neat stuff ain’t it!? So instead of a roughly idling, hard starting, fuel guzzling carburetor, you’re left with a finely tuned Swiss watch of an induction system.

Oh, and I almost forgot one of the most important aspects of adding an EFI system—the fuel mileage. When I first got the ’68 up and running in its latest incarnation, I was pretty excited at what the five-speed transmission and 3.73 rear ratio would yield when it came to highway gas mileage. Once I crunched the numbers, however, I was left wanting a bit more. Based on my initial calculations, the stock 307 with a 650 carb was good for about 13 mpg on the highway, cruising at about 65 mph. Not too bad for a big, heavy, longbed truck, but not exactly an ideal daily driver status. With the new Holley Avenger EFI setup, however, I’ve bumped that number up to a much more economical, wait for it…18 mpg! Ok, so that doesn’t seem like much, but a quick calculation says that for every twenty gallons of gas, I’m getting an additional hundred miles of out it. And at nearly five bucks a gallon, that’s pretty darn good! CCT

SOURCE
Brothers Truck Parts
801 E Parkridge Ave
Corona
CA  92879
800-977-2767
http://www.brotherstrucks.com
Holley
1801 Russellville Road
Bowling Green
KY  42101
270-781-9741
www.holley.com