View Full Version : Fuel level gauge
03-21-2005, 07:08 AM
I am going to replace my current malfunctioning float type fuel level gauge. The tank is aluminum, about 30 inches deep and holds 17 gals. I'm also not happy with the non-linear response of the gauge, it's accurate in the middle but not in the last quarter of the tank. The sender float assy is a Sunpro CP7583. It is made for tanks up to 26 inches deep but I put a longer rod on it to reach the bottom. Being able to sense the entire tank is essential in any new arrangement.
Does anyone have any suggestions for a better arrangement? Either a better float or a capacitance unit. I intend to change the gauge to a dual fuel pressure/level unit to save panel space so utilizing the existing gauge is not important.
03-21-2005, 12:46 PM
Does anyone have any suggestions for a better arrangement? Either a better float or a capacitance unit.Larry,
Princeton Electronics makes a 5 set point push-button programmable capacitance fuel sender that should work a lot better with your round tank. Their senders are compatible with all standard 0-5 volt fuel gauges. I'm currently using their 2 set point model on my GyroBee (with a square sided tank) and a miniature 1-1/4" UMA fuel gauge. I've had excellent results.
Unfortunately, Princeton Electronics doesn't have a web site, but you can read details about their probes on the Aircraft-Spruce web site. (http://www.aircraftspruce.com/catalog/inpages/princefuelprobes.php)
If you have any questions feel free to call Princeton direct (I can dig up the telephone number in my paperwork at home) and discuss your situation with them. They custom make probes any way you need and will sell direct. In fact, I think A/C-Spruce doesn't stock the probes but just takes your order, turns around and places the order with Princeton, then has it dropped shipped to you.
PRA Chapter 30
Western WA State
03-21-2005, 02:23 PM
Found this contact info...
Todd Stehouwer at Princeton Electronics 616 281 5193
Some pics of one these units in a plane:
03-21-2005, 07:04 PM
Does anyone have any suggestions for a better arrangement? Either a better float or a capacitance unit.
One of the best investments I made in my tens of thousands of dollars in gyros was the flowmeter for about $450. I think it was a FS-450. It plugged into the gps and told me ALL KINDS of fuel data -- including time remaining to tanks empty to within 3 or 4 minutes. I actually ran tanks dry once or twice to check it.
03-21-2005, 07:50 PM
There's also the NavMan Fuel 2100 (http://www.navman.com/marine/products/fuel/fuel2100/index.html#) Fuel Flow Indicator for $129 from Boater's World. (http://www.boatersworld.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&catalogId=10051&langId=-1&productId=8256714)
They've been used on Experimental aircraft with very good results. Chuck Irby had one on his Dominator.
03-22-2005, 06:20 AM
John, Al, David and Mike, thanks for your response, I really appreciate it. Sorry to give the impression that my tank was round; it's rectangular. John, I'm glad to hear you are getting great results with your unit. I was a little concerned with a capacitance unit because I replaced a capacitance sender on my wife's car and it now reads 1/4 tank less than actual. There was no way to calibrate it, if it was incorrect I was told to simply swap it out. Obviously that wasn't going to happen because of its location and work involved. Having the capability to calibrate is a significant feature. Access to the head for calibration will not be a problem on my craft.
David and Mike, do the fuel flow meters work with a recirculating fuel system? I have a fuel injected EJ-22 which supplies excess fuel to the fuel injector rail and allows unused fuel to return to the tank. I believe they do this to ensure that there will always be adequate fuel and the proper fuel air ratio regardless of the throttle setting.
03-22-2005, 07:35 AM
The NavMan works only with carbureted engines.
I don't know about the FS-450.
But I recall someone posting about how to make one of these units work with a fuel injection system. Something about using a seperate recirculation tank, and putting the sender between the main tank and recirculation tank.
Maybe they're reading this thread and chime in.
03-25-2005, 06:35 PM
Hey guys, I will let you know about the NAVMAN, I have one going in my next project. Looks like a good unit.
03-30-2005, 04:11 PM
Hey, the Navman came today...Nice unit and a really long sending wire, says it works for 30hp and up to 300 carburated engines. Programable fuel total and level alarm...looks like it should work pretty good on the 582, I will keep you guys posted.
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