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Old 01-03-2015, 17:56   #1
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Fuel Tank Sending Unit.

I have a steel fuel tank (gasoline ) that was not set up for a sending unit. Without punching a hole in the tank is there any unit that could be added my only access is a one inch IPS female in the top of the tank. Does anyone know of a unit that can be installed? I'm hooking up a flow meter to at least have a clue, but I want to know what's in my tank not guess.
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Old 01-03-2015, 18:55   #2
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Re: Fuel Tank Sending Unit.

Pricey but I think it will work.

The Tank Tender - by Hart Systems, Inc.
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Old 01-03-2015, 21:19   #3
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Re: Fuel Tank Sending Unit.

Thanks it is pricey as you said but if it's compatable with gasoline it might just do the trick. I sent the munufacturer an email to see if it will do gas, they list diesel, but I'm concerned the fumes from gas may be problematic.

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Old 03-03-2015, 11:28   #4
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Re: Fuel Tank Sending Unit.

Not compatable with gasoline. At least officially. What I got from hart systems was concern about a damaged plastic tube causing syphoning.

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Old 03-03-2015, 12:12   #5
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Re: Fuel Tank Sending Unit.

I looked for same for several yrs-no luck.
This is as close as I got.Liquid Sensors - Marine Diesel, Fuel, or Water Level Sensor

Would req. 1" nipple & 1" x 1-1/2" red. coupling. to adapt & not sure if sender float would go thru your 1" tank hole.
I ended up drilling for std 5 hole sender in my diesel tank,but yours is gas.
Can be done by filling tank with CO2 or water first.
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Old 03-03-2015, 12:27   #6
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Re: Fuel Tank Sending Unit.

There is a type of liquid level sensor that uses air pressure to measure liquid level in a tank. I don't remember the name or anything more, but a web search might find it. I would think it would work with gasoline because the liquid only comes in contact with a tube.
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Old 03-03-2015, 12:46   #7
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Re: Fuel Tank Sending Unit.

Thanks deblin I came to same conclusions but I don't want to pull tank to punch it .po had just replaced it before I bought it I can't believe someone would not make some provision but I guess not.
Rwidman thanks that's the one above manufacturer says no go on gas because plastic tube is to bottom of tank and could syphon if damaged

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Old 03-03-2015, 13:05   #8
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Re: Fuel Tank Sending Unit.

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Originally Posted by wooden head View Post
Thanks deblin I came to same conclusions but I don't want to pull tank to punch it .po had just replaced it before I bought it I can't believe someone would not make some provision but I guess not.
Rwidman thanks that's the one above manufacturer says no go on gas because plastic tube is to bottom of tank and could syphon if damaged

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Got it. I wonder why they wouldn't use a metal tube or have one for an option.

There are also ultrasonic sensors that measure the distance from the top of the fluid to the sensor. You might look into that.

I thought about sight tubes but that would probably not be safe with gasoline.
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Old 03-03-2015, 13:43   #9
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Re: Fuel Tank Sending Unit.

Bummer on the tank tender.

A few years ago someone was selling a thin cylindrical unit at boat show">Annapolis boat show.

IIFC it was using LEDs and light detectors. File interrupted the light beam.

Not a clue who they were of if they are still around.
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Old 06-03-2015, 21:54   #10
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Re: Fuel Tank Sending Unit.

I had seen something using light but that was before I bought this boat and I have been unable to find it since

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Old 07-03-2015, 03:09   #11
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Re: Fuel Tank Sending Unit.

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Originally Posted by wooden head View Post
I had seen something using light ...
Optical fuel sensors are usually single point devices, used for low fuel warning light etc.
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Old 07-03-2015, 10:32   #12
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Re: Fuel Tank Sending Unit.

Even just a reliable low fuel warning would be nice. With no spare and no sail running dry is no good. I don't want to carry a spare can. because there is no safe place for it the second tank is decommissioned for I don't know what reason. it's buried under the settee so pulling and inspecting or replacing is a bear.

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