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Discussion Starter #1
On my 98 Ducati SR2...it appears to be a simple speed density port injection, inputs from throttle position, engine and ambient temperature and RPM...It's a return system, the pump in the tank...On autos/truck port injection they generally have around a 50 PSI system pressure ith some sort of pressure regulator...My question, what regulates the fuel pressure? The pump or is there a relief valve on the injector itself? Nothing is wrong with the bike, just curious
 

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If you follow the fuel line you’ll see a pressure regulator inline.



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Discussion Starter #3
I found the pressure regulator on the removable plate on the fuel tank....Looks like the one above but enclosed in the aluminum cover plate...
What Ducati is that above in the drawing?
 

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2001 900SSie
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Yeah, what is an SR2?

I owned two S2Rs, one 800 (803) and one 1000 (992).

ST2 maybe? I don't know anything about those...

But you have to provide good info if you want a valid answer.
Maybe a pic would help work out what it is.

Typically Ducs run at 3 Bar/43.5 PSI.
Depending on the ECU there are more or less refinements.

Basic ECUs like my 15M uses TP, RPM, engine temp, air temp, battery voltage and air pressure to determine injector duration for fuelling.
Also ignition timing - advance
Accel or Decel fuelling I understand depends on rate of change of TP.
Battery voltage is measured as injectors and coils are inductive circuits.
 

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bike is an st2. they started putting the reg in the pump plate on 916. ductech's pic shows the same reg in a holder for the external application.

ductech's parts pic is from an ssie or steel tank mie.
 
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