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					Originally Posted by  Richard L
					 
				 
				That is a much sensible approach, monitoring a location where you have reached a full capacity.  You basically monitor one point, hardign wourth getting a guage. You can get a flow switch at much lower cost and achieve the same result.  
 
This method will only work if you have a progressive boost only system. But beware the afr will be different under different gears. 
			
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 I'm leaning towards the AFR approach because it'l tell me if there's something wrong with the whole fuel system, not just the w/m system. But I might just try the flow switch approach. Thanks for the idea 
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					Originally Posted by  keithmac
					 
				 
				I made my own failsafe with 2 transistors,a potentiometer and a 5 pin relay, was a while back but it cost less than ?10 for the bits.. 
			
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 I'm planning on using a Hobbs switch, 5v relay and use piggy for 2D afr/rpm signal - crude but should work at full boost 
Other topic. Is the pump flow directly related to voltage? (ie. 8volts = 50% flow; 12volts = 100% flow) Or does the controller send pulses to control flow?