You should listen to me. No, seriously, listen to me.
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Re: Regulate fuel pressure K6. Permanent pump.
You seem to be intimating that the ECM cycles the pump on and off to maintain the correct pressure. That's doubtful as the SDS doesn't even monitor the signal to the pump relay, which it certainly would do if it was cycling on and off. Furthermore the delivered pressure isn't measured so the ECM would have to infer the pressure from the injector duty, possible but iffy. I'm fairly sure that the pump runs all the time and regulation is solely by the pump's pressure regulator. Note that the pressure test in the service manual measures the deadheaded pressure. That's inconsistent with the ECM turning the pump off to keep the pressure at the 300 KPa level.
I suggest that you look at the fuel pump relay and the lines to/from it (measure the coil resistance and voltage levels) as that's more likely to be where your problem is. As a quicky test, swap the fuel pump and cooling fan relays.
P.S. I'm unimpressed by your bypassing the tipover switch and wonder if it has something to do with your problem. How did you do it? Your premise that the ECM cycles the pump on/off to maintain pressure, bypassing the tipover switch, plus the use of terms like "brain" and "magic keys" suggests that you're over your head. Frankly a visit to the dealer is probably in order and, given what appears to have been done, a "megga bill" may result.
"Presume the other contact at pump plate is a regulator feedback"
That's the level sensor signal, as is clearly shown in the service manual. You're just inventing things that have little to do with reality.
Last edited by BillV; 01-20-2017 at 03:13 PM.
Reason: Added P.S.