Quote:
Originally Posted by jrnicl3
And What will the fuel pressure gauges do? Help!! I am new to it.
I'm Learning. Thanks!
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CIS works on vacuum and pressure. There is no mass air flow sensor - it's old, old, old. However, Ferrari used it in the 512 BB so it ain't that bad. Seriously, it was state of the art in the early eighties.
The fuel pressure gauge will tell you system pressure (core pressure), cold and warm control pressure as well as residual pressure.
The system does not allow the fuel pump to dictate the fuel pressure at the injectors. The fuel pump MUST deliver at a subscribed rate but there are other goodies that throttle the 70-ish psi system pressure to a operation-friendly lower psi at the injectors. Straight system pressure would piss so much fuel through the injectors the car would choke and die from being too rich.
This is where the fuel regulator enters. It takes the system pressure and throttles it back, based on how cold or warm the engine is, and feeds the injectors the pressure - called control pressure - that they need to feed the engine the right amount of fuel.
The gauges tell you what the fuel regulator is doing.