Originally Posted by
P057
Speaking of DFCO, Lauren:
I can understand how people misspell my name when they only hear it spoken... but I'll never understand why people get it wrong on a forum.
Originally Posted by P057
I can see when I let off the gas, the fuel PSI remains at the lowest, the injection amount per cyl turns to zero, and the gallons-per-hour goes really low.
How do the injectors still have PSI!?
I'll take a video or record actual numbers, rather than going off the top of my head.
Your fuel injection system should maintain a nearly constant fuel pressure at the fuel rail at all times. This is pressure, NOT flow. The fuel injectors pulse on and off to provide fuel to the engine. Keeping the pressure constant, the ECU can precisely control the timing of the injector pulses and know precisely how much fuel is being delivered at any given time. Cool, huh?
If you have DFCO and actually engage it, the GPH should drop to absolute zero because the fuel injectors have stopped pulsing altogether. (but you'll still have that constant fuel pressure there and ready for when the ECU decides the engine needs fuel)
It's exactly like closing the nozzle on the end of a water hose. When you close it, water stops flowing, but there's STILL water pressure in the hose behind the nozzle.