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Electric Fuel Pressure Gauge

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edleine61(at)gmail.com
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Posted: Sun Jul 10, 2016 3:26 am Post subject: Electric Fuel Pressure Gauge

How does an electric fuel pressure gauge work?  Specifically, what power supply must be provided? What amperage? 

 

I am installing a Holly brand fuel pressure gauge on the fuel pressure regulator servicing the Bing 94 carburetor on my Rotec R2800 radial engine.  The installation will be temporary during the Phase 1 flight test period.  My idea is to power the gauge via the 12V accessory (cigarette lighter) outlet. Should this be an adequate power supply?

 

Thanks.

 

Ed Leineweber

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ceengland7(at)gmail.com
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Posted: Sun Jul 10, 2016 4:47 am Post subject: Electric Fuel Pressure Gauge

On Sun, Jul 10, 2016 at 6:24 AM, Ed Leineweber <edleine61(at)gmail.com (edleine61(at)gmail.com)> wrote:

 	  Quote: 	
		  

How does an electric fuel pressure gauge work?Â  Specifically, what power supply must be provided? What amperage? 

Â 

I am installing a Holly brand fuel pressure gauge on the fuel pressure regulator servicing the Bing 94 carburetor on my Rotec R2800 radial engine.Â  The installation will be temporary during the Phase 1 flight test period.Â  My idea is to power the gauge via the 12V accessory (cigarette lighter) outlet. Should this be an adequate power supply?

Â 

Thanks.

Â 

Ed Leineweber



	




Â What does the installation guide for the gauge say? If it's a typical off-the-shelf gauge that's sold for installation in cars, then 12V supply would be likely. Current consumption should be insignificant; milliamps rather than amps.Â 

Older 'can type' sensors work by pressure moving a diaphragm, which moves the 'wiper' of what amounts to a volume control, varying the voltage to the meter. Newer solid state sensors with 3 wires use a 'strain gauge' in the case. A lot of the solid state sensors expect to be supplied with 5V, but a dedicated gauge would likely supply the reduced voltage to the sensor.

Charlie

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Jul 10, 2016 7:17 am Post subject: Electric Fuel Pressure Gauge

At 07:46 AM 7/10/2016, you wrote:



  	  Quote: 	
		  On Sun, Jul 10, 2016 at 6:24 AM, Ed Leineweber <edleine61(at)gmail.com (edleine61(at)gmail.com)> wrote:

  

  How does an electric fuel pressure gauge work?Â  Specifically, what power supply must be provided? What amperage? 



  Â 



  I am installing a Holly brand fuel pressure gauge on the fuel pressure regulator servicing the Bing 94 carburetor on my Rotec R2800 radial engine.Â  The installation will be temporary during the Phase 1 flight test period.Â  My idea is to power the gauge via the 12V accessory (cigarette lighter) outlet. Should this be an adequate power supply? 	
 

   I believe the vast majority of OEM and after market automotive

   instruments are of the 'moving magnet' variety. A

   magnet is mounted to a shaft such that it lies within

   the effects of two stationary, electromagnets. Energizing

   electromagnet 1 moves a pointer to one end of the

   scale, energizing EM2 moves it toward the other end

   of the scale.



 [img]cid:.0[/img]



   The position of the pointer is the vector sum of the

   fields generated by the two electromagnets. Hence,

   the pointer depicts some ratio of the two energizing

   currents.  The cool thing about this technique is

   simplicity of manufacture. The pointer doesn't need

   to have return springs. The magnet can be immersed in

   a damping fluid that causes it to integrate small

   fluctuations in the measured current thus giving

   a steady reading when the signal (like fuel sloshing

   in a tank) is wiggly. The positioning forces are

   large meaning that the pointer shaft need not

   be supported on low-friction bearings . . . often

   simply stuck through a hole in sheet metal or

   plastic.



  http://tinyurl.com/zlsovbe



   I've just installed a new 'sender' in my truck to

   replace one that blew a gasket and was leaking oil

   under 40psi pressure! The sender's specs call for

   a resistance of 10-180 ohms resistance over a 0 to

   150 psi stimulus.



  http://tinyurl.com/jqh4umt



   This means that the instrument reading this variable

   resistance is designed to indicate 0 psi when current

   thru 10 ohms is impressed on the left-most coil and

   allowing the pointer to move toward the right-most

   coil as the resistance goes up to 180 ohms with

   increasing pressure. My new sender isn't the stock

   GMC part, so the instrument that came with the sender

   will have to be installed also.



   The instructions with this, and most after-market

   instruments will show three terminals on the

   back . . . one of which goes to 14v bus, one to

   ground, the other to the 'sender' which is grounded

   through its fitting to engine's crankcase.



   These two-coil instruments are generally limited to a

   small stroke scale . . . on the order of 90 degrees

   maximum and their accuracy is generally on the order

   of 5 to 10 percent of reading.  Multi coil insturments

   can offer longer arcs . . . like speedometers. Further,

   when driven by software in ECUs, they can be much more

   accurate . . . perhaps 1-2 percent.



   In the case of the oil pressure instrument, the 'sender'

   (transducer) and instrument must be matched to each

   other. They consume very lo currents from the bus . . .

   on the order of 50 milliamps.



   



 

   Bob . . .

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