RX3 Fuel Float

Caribbean Rider · 01-25-2017, 03:37 PM

I've got 3 RX3's, and both register empty.

The fuel level sending units were pulled and plugged back into the harness, and raising the float arm registers fuel level.

Put them back in, filled up the tanks...and a flashlight shows neither float rises with the fuel level. We can raise the lever with a coathanger and the fuel level rises on the gauge.

WTF?

We took the fuel sender unit out to see if somehow the float itself has been compromised and it's not. There seems to be resistance in how the arm swings.

We cleaned the pivot and put it in a bucket of water (different density than gasoline, heavier)

Reinstalled, it still doesn't rise properly, but at least registers: one bar with a full tank, but still not floating to the top. Shaking the tank, sloshing fuel around shows some gauge response and then returned to no bars.

Any thoughts? Am I looking at a new sending unit?

ElectricCircus · 01-26-2017, 12:50 PM

A guy made this step by step procedure to adjust the RX3´s fuel level sensor.
It´s in spanish, but there are plenty of pictures that maybe will help you:

https://coltermoto.wordpress.com/tri...ible-flotante/

From my point of view it is useful for the "zero" adjustment (let´s say: "E" light blinking exactly when there is time to switch the fuel valve to the Reserve position), but isn´t enough for the "full span" adjustment also required: after that my fueld gauge is perfect for Empty, but indicates "Full" at 50% of fuel.

Caribbean Rider · 01-29-2017, 01:01 PM

Quote:

Originally Posted by ElectricCircus

A guy made this step by step procedure to adjust the RX3´s fuel level sensor.
It´s in spanish, but there are plenty of pictures that maybe will help you:

https://coltermoto.wordpress.com/tri...ible-flotante/

From my point of view it is useful for the "zero" adjustment (let´s say: "E" light blinking exactly when there is time to switch the fuel valve to the Reserve position), but isn´t enough for the "full span" adjustment also required: after that my fueld gauge is perfect for Empty, but indicates "Full" at 50% of fuel.

Why would the float not rise with the fuel level?

Caribbean Rider · 01-29-2017, 01:19 PM

I am wondering if my tech re-installed the fuel sender correctly.

The basics: which direction does the float go? Forward or backwards?

Caribbean Rider · 01-30-2017, 06:40 PM

Since I have new units on order, for spits and grins we took off the float on one and pushed on two wine corks.

Worked perfectly. Gauge works fine.

We broke the float in two and discovered it was completely saturated with fuel. We have no idea how that happened.

The float was the problem, most likely on the other RX3 also.

2LZ · 01-30-2017, 08:48 PM

Quote:

Originally Posted by Caribbean Rider

Since I have new units on order, for spits and grins we took off the float on one and pushed on two wine corks.

Worked perfectly. Gauge works fine.

We broke the float in two and discovered it was completely saturated with fuel. We have no idea how that happened.

The float was the problem, most likely on the other RX3 also.

I believe that you're the first....but it's a good thing to keep our eyes on.

01-25-2017, 03:37 PM	#1
Caribbean Rider Join Date: Jun 2015 Posts: 19	RX3 Fuel Float I've got 3 RX3's, and both register empty. The fuel level sending units were pulled and plugged back into the harness, and raising the float arm registers fuel level. Put them back in, filled up the tanks...and a flashlight shows neither float rises with the fuel level. We can raise the lever with a coathanger and the fuel level rises on the gauge. WTF? We took the fuel sender unit out to see if somehow the float itself has been compromised and it's not. There seems to be resistance in how the arm swings. We cleaned the pivot and put it in a bucket of water (different density than gasoline, heavier) Reinstalled, it still doesn't rise properly, but at least registers: one bar with a full tank, but still not floating to the top. Shaking the tank, sloshing fuel around shows some gauge response and then returned to no bars. Any thoughts? Am I looking at a new sending unit? Last edited by Caribbean Rider; 01-29-2017 at 01:01 PM.
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01-26-2017, 12:50 PM	#2
ElectricCircus Join Date: Sep 2015 Location: Neuquén, Argentina Posts: 128	Fuel gauge adjustment A guy made this step by step procedure to adjust the RX3´s fuel level sensor. It´s in spanish, but there are plenty of pictures that maybe will help you: https://coltermoto.wordpress.com/tri...ible-flotante/ From my point of view it is useful for the "zero" adjustment (let´s say: "E" light blinking exactly when there is time to switch the fuel valve to the Reserve position), but isn´t enough for the "full span" adjustment also required: after that my fueld gauge is perfect for Empty, but indicates "Full" at 50% of fuel. __________________ ______________ - ex Honda MB100 (1981) - ex Honda Nighthawk 250 (1991) - ex Honda Storm 125 (2009) - ex Corven Triax 250 Touring (2016) (Zongshen RX3 carb) Benelli TRK 502 (2018)
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01-29-2017, 01:19 PM	#4
Caribbean Rider Join Date: Jun 2015 Posts: 19	I am wondering if my tech re-installed the fuel sender correctly. The basics: which direction does the float go? Forward or backwards?
	0

01-30-2017, 06:40 PM	#5
Caribbean Rider Join Date: Jun 2015 Posts: 19	Since I have new units on order, for spits and grins we took off the float on one and pushed on two wine corks. Worked perfectly. Gauge works fine. We broke the float in two and discovered it was completely saturated with fuel. We have no idea how that happened. The float was the problem, most likely on the other RX3 also.
	1