Netters, ON auto applications where there is multi-point fuel injection the fuel IS constantly re-circulated back to the tank, through a return line that is BELOW the fuel pickup for the fuel pump. The pump is only immersed in fuel completely at high levels and is cooled by gas flowing through it, hence the need for constant circulation. It also provides alot more fuel volume and pressure, so that at high demands the pressure regulator, also a part of ALL late model systems, will close and boost the normal line pressure up from 30-45 psi upwards of 50-65 psi, for the period of acceleration. This makes it possible for the fuel injection system to replace the mechanical carb part known as a power valve, which opens to supplement the fuel required only during acceleration. The pump is located in the tank to allow it to push the entire time not pull. Even the earlier TBI injection systems re-circulated fuel just at a lower pressure. Warnings to relieve pressure are for safety due to the high line pressure maintained for normal operation. IF this type of system is to be used on a KR the entire operating system must be duplicated or you will be going way out on a limb designing your own version.
Colin & Bev Rainey KR2(td) N96TA Sanford, FL crain...@cfl.rr.com or crbrn9...@hotmail.com http://kr-builder.org/Colin/index.html
