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Author Topic:   Smartcraft Fuel FLow
adriano posted 11-10-2008 08:13 AM ET (US)   Profile for adriano   Send Email to adriano  
Hi there. How does the PCM in a SmartCraft engine work out what the GPH fuel flow reading is?

Is it a similar system to a FloScan sender? Or is it based on counting some sort of electrical pulsing from the injectors?


jimh posted 11-10-2008 09:00 AM ET (US)     Profile for jimh  Send Email to jimh     
I do not believe there is an external fuel flow sensor in a SmartCraft system. Fuel flow is deduced from the engine operating speed and time.
glen e posted 11-10-2008 11:09 AM ET (US)     Profile for glen e  Send Email to glen e     
smartcraft derives it's fuel flow from injector firing duration....
adriano posted 11-10-2008 03:53 PM ET (US)     Profile for adriano  Send Email to adriano     
Thank you for the replies.

I have twin 2001 OptiMax 150-HP motor. All of a sudden one of them is showing an increased GPH rate. To be exact it is showing 8.9 GPH at 3,700-RPM while the other engine shows 6.8 GPH. A fuel flow rate of 6.8 GPH seems to be the correct value as I have data from previous trips recorded.

Both engines are running fine and I do not feel anything wrong beside the GPH increased reading.

See the solution of this [malfunction] in Optimax 150 - Increased Fuel Consumption

jimh posted 11-16-2008 09:44 AM ET (US)     Profile for jimh  Send Email to jimh     
Were you operating both engines at the same engine speed when one engine showed a higher rate of fuel flow than the other? If yes, then, if the fuel flow is deduced from the injector pulse and time integration, I don't understand how it would show a higher rate of fuel flow. There wouldn't have been more fuel flowing over time if the engine with higher fuel flow ran at the same RPM as the other other engine that was operating normally.
jimh posted 11-18-2008 12:55 AM ET (US)     Profile for jimh  Send Email to jimh     
Does anyone else see the conundrum of this situation?

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