6. From the fuel filter, the line travels along the framerail to the Holley Hi-Flow fuel rails, connecting via ORB-10 fittings. Their 5⁄8-inch diameter fuel passage provides the flow capacity for high-horsepower applications and won't constrict the fuel flow coming from the AN-8 line. Four 42-lb/hr injectors are fed by each fuel rail, more than enough for our supercharged 327.
7, 8. Another AN-8 line mates the driver-side fuel rail to the passenger-side fuel rail ...
9. … and another quartet of 42-lb/hr injectors.
10. The big difference on the passenger side is the fuel regulator. Here, the A1000 Injected Bypass Regulator mates to the Holley fuel rail via an ORB-10 to ORB-6 swivel adapter. The regulator ensures that both fuel rails maintain the pressure they need to provide the injectors before it bleeds off the excess via an ORB-6 return port out the bottom of the regulator. From here, the excess fuel is bled back into the fuel tank via AN-6 stainless braided line, completing the fuel system.
AN-6 versus AN-8
11. Here's the difference between an AN-6 and AN-8 fitting. Remember that the AN-6 is a 3⁄8-inch ID while the AN-8 is 1⁄2-inch. While most mild (< 400 HP) engines would be fine with an AN-6 line, we opted to err on the safe side and run AN-8 on the inlet side. Since the return line is basically a bleed-off, AN-6 is fine to use on that end of things. Fuel starvation can kill engines, so it's cheap insurance. Note that both fittings mate to an ORB-6 on top.
Mating Stainless Braided Line To an AN Fitting
12. When it comes to mating stainless braided line to an AN fitting, the first step is to cut the line to length. First, the line is tightly wrapped with electrical tape to keep the cut end from fraying.
13. Then, the line is cut to length using a 4-inch cutoff wheel. Note that the cut is made through the section that has been wrapped in electrical tape.
14. Once cut, the electrical tape is removed and the socket is pushed onto the hose. If fraying is kept to a minimum, the socket will seat fully onto the hose.
15, 16. Next, the insert is threaded into the socket, drawing the hose tight and thereby completing the connection. In this example, a 90-degree ORB-10 to AN-8 fitting is being used.
Feeding The Beast
17. Submerging the pump inside the tank not only increases pump longevity by keeping it nice and cool, but also reduces noise and vibration that can be attributed to a frame-mounted fuel pump. Housed inside a baffling system in the tank controls fuel slosh and keeps the 340 Stealth pump submerged during even the most aggressive driving. This results in consistent pump performance even at low fuel levels.
18. The 340 Stealth electric fuel pump uses a turbine pump mechanism for increased durability and performance, an impressive 340 lph. A pre-pump filter sock assembly keeps any debris from being sucked into the pump assembly, improving pump life and performance as well as helping protect the rest of the fuel system.