Aeromotive 13159 - MARINE A1000 INJECTED BYPASS REGULATOR - Manual (Page 3)

9. Figure 1-1 depicts a fuel rail with only one fuel line connection, such as is commonly found on OEM
factory fuel rails as used in late model “returnless” fuel systems beginning in 1999. Positioning the
regulator after the fuel rail is optimum for performance applications, however your new Aeromotive
regulator may be configured for a “returnless” type of engine/fuel rail by flowing into one of the
regulator side ports from the pump and out of the opposite side port into the fuel rail. A return line
must be routed from from the regulator bottom/return port back to the top of the fuel tank.
FIGURE 1-1
Figure 1-2 is optimum for performanc V8 engines with duel fuel rails, offering both inlet and outlet ports.
FIGURE 1-2