BO
Looking for assistance I'm getting a rpm loss signal fault. it occurs 4-5 seconds after cranking starts. The engine cranks i can feel the fuel solenoids click when they turn on the Bosch actuator is open about 1/4 during cranking,  engine cranks for 4-5 seconds, engine fires one time, front panel lights the run light for a split second then loss rpm signal fault appears. i checked the mpu it has 1000 ohms resistance, removed it and cleaned it reinstalled and set at 3/4 turn from bottom centered on tooth. voltage feed back is .5 VAC. during crank. fuel supply is 13 inch wc. Once the engine fires and dies at that point the Bosch actuator opens to full open position. Should I have more feed back voltage on the mpu? 

MODEL QT15068KNAC
SER 9176294
150KW
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78buckshot
I don't have specs for the 150kw but I think you should adjust it for 1-3 volts cranking, also at 13" fuel pressure we can assume you are running propane and if not you might be too high.
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Peddler
I set them for 1 volt AC while cranking.  The fuel enrichment solenoid/s must open while cranking and the gas has to be set to the label requirements.  I have had to change fittings on the fuel enrichment valves to allow for more fuel flow on one of these large units but for sure you need to make sure they are opening.
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BO
One thing i noticed was if i turned off the gas and cranked the engine i didn't get the loss of rpm signal. I only get the rpm fault when the engine fires once. This is a 2014 generator and they have not ran it much (11 HOURS).
I'm thinking i"m getting a false Rpm fault when it could be a fuel issue. Have you seen anything like this before?
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Birken Vogt
I would set up and start spraying flammable cleaner down the intake at the time when it seems to starve out.  Even on a big V8 you can get it running by doing this even if there is complete lack of delivery from the regular gas fuel system.  You meter the amount with your finger on the spray valve until you hear it right rich or lean.

I think you are on the right track with a fuel delivery/enrichment issue.
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BO
I had a chance to get back over to spray some flammable cleaner in the intake and could keep it running, so i took the regulators apart to look for debris they all looked good. but this system has a solenoid in the vent side of the regulator, i found i couldn't  blow through it when it was powered up. i eventually freed up the solenoid reassembled and the engine started on it's own every time. thanks for the help guys.
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Peddler
That is a fuel air mixture solenoid for a California generator. It is controlled by the oxygen sensor and it modulates between open to the atmosphere and closed.  
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