By-passing the fuel sender

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By-passing the fuel sender

Postby emilio67 » Wed Feb 12, 2014 1:59 am

Hi Guys,
does anyone know how to bypass the fuel sender so that the tack stops reading 8k please ?

thanks
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Re: By-passing the fuel sender

Postby SilverRider » Wed Feb 12, 2014 12:44 pm

Take a 1 inch piece of wire, bend to U shape, jam into female connector(on the bike side).

Hope you know what your mpg rate is.
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Re: By-passing the fuel sender

Postby emilio67 » Wed Feb 12, 2014 3:57 pm

if you talking about bridging the connector to the fuel sender, i wish it was that easy.
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Re: By-passing the fuel sender

Postby Insulinboy » Wed Feb 12, 2014 6:00 pm

you need to use a resistor, but I don't know off the top of my head how much resistance there is supposed to be.

Before you go into that though check the bulb in the dash, if its blown it will set off the error as well
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Re: By-passing the fuel sender

Postby emilio67 » Thu Feb 13, 2014 1:16 am

I have read a few write ups on it but have not yet read a success story on it. I am not sure what resister would do the trick for both the sender unit and the bulb.
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Re: By-passing the fuel sender

Postby ptrimby » Thu Feb 13, 2014 6:54 pm

mhackett wrote:I had occasion to measure the resistance of the sender a few weeks ago, it was very close to 1000 ohms when fully submerged. It would vary between there and something less than 100 ohms gradually as more of it is exposed above the fuel level in the tank. Fuel sloshing around when it's near the level of the sensor will produce the effect you described.

Mike


Boom. Should help you out. As long as that was not wrong/on a bad sensor.
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Re: By-passing the fuel sender

Postby emilio67 » Fri Feb 14, 2014 2:06 pm

i will try a 1000 ohm resistor and post the result when i do. thanks
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Re: By-passing the fuel sender

Postby ptrimby » Sat Feb 15, 2014 12:32 am

I just measured my sender on a 50% tank, as it's been giving me troubles (not turning on the light, even if completely empty). I am not getting the 8k-code, however. It measures out at 3.2k - I'll be draining the tank this weekend to see what it is empty, and then to replace it with a new one - will check what the new one is then too (if I get a chance).
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Re: By-passing the fuel sender

Postby emilio67 » Wed Feb 19, 2014 3:28 pm

I have tried a few resister types, and have read it could have a resistance of 1,000 ohms (1 kiloohm) or 3,200ohms (3.2kiloohms) when submerged in fuel. Quite a big difference? If a blown indicator bulb which is only 5.6 ohms (0.0056 kiloohms) can set off the tack error (reading 8k), its seems pretty impossible to stop this error message without understanding the ohms resistance first..... i guess ? :doh

Anyone with this experience who can offer me their knowledge would be appreciated.
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Re: By-passing the fuel sender

Postby ptrimby » Wed Feb 19, 2014 11:21 pm

emilio67 wrote:I have tried a few resister types, and have read it could have a resistance of 1,000 ohms (1 kiloohm) or 3,200ohms (3.2kiloohms) when submerged in fuel. Quite a big difference? If a blown indicator bulb which is only 5.6 ohms (0.0056 kiloohms) can set off the tack error (reading 8k), its seems pretty impossible to stop this error message without understanding the ohms resistance first..... i guess ? :doh

Anyone with this experience who can offer me their knowledge would be appreciated.


The blown bulb creates a break in the circuit, which is what sets off the code. Too-high of a resistance (blown bulb making a break in the circuit) will set off the 8k-notice. Possibly, too low of a resistance could also set it off. a 1.2kΩ to 3.2kΩ resistor should work is what I'm thinking. Possibly, a 1kΩ may make the light illuminate.
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Re: By-passing the fuel sender

Postby emilio67 » Thu Feb 20, 2014 3:57 pm

Creating an open circuit when the bulb blows is easy to understand. I suppose the same goes for the sender. But too high resistance causing the same result i cannot understand. Anyway, I have tried various combinations (resistances) connecting both the bulb and the sender couplings with resisters (individually and both together) using resisters ranging from 0.5 to about 3.0kn but nothing yet has done the trick. I'm thinking it requires a very precise resistance (especially knowing the bulb is only 5.6 ohms). Perhaps i may have an additional problem like a short somewhere or something??
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Re: By-passing the fuel sender

Postby Reserector » Fri Feb 21, 2014 1:36 pm

Could you possibly plug in a sender and a bulb to see if the tach error goes away, and the bulb lights? In other words, go back to ground zero and see if that works, at least.
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Re: By-passing the fuel sender

Postby emilio67 » Fri Feb 21, 2014 1:47 pm

Seems the only way forward.
i will however post the results of its resistance when i have a new one in my hands.
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Re: By-passing the fuel sender

Postby emilio67 » Mon Mar 03, 2014 3:52 pm

For information purposes the fuel sender is 1105 ohms dry and 1128 ohms submerged in fuel.
However the new fuel sender did not solve the problem of the tach reading 8k. Checked and double checked by removing the led dash light and replaced it with a 3.4W bulb (42 ohms) and checked the wires for continuity from the starter relay to the dash and from the dash light to the sender. No problems there.

Any ideas except for replacing the ECU.

What i can say is that this occurred when the ignition fuse blew 3 times in a row. Having said before that time the fuel light was always on .... i assumed i just needed a new fuel sender. Well the new fuel sender did not solve the 8k. grrrr....The only thing left seems to be the ECU ! :doh

I wish i new a way to by-pass the ECU to get the tach working?? I read that when riders change their tach to a digital version they connect to the coil orange and grey wires. Anyone had experience with this ?
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Re: By-passing the fuel sender

Postby Reserector » Fri Mar 07, 2014 6:15 pm

I suppose the ECU could have gotten zapped. Makes sense now that you mention all the other clues in one paragraph.
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Re: By-passing the fuel sender

Postby emilio67 » Sat Mar 08, 2014 5:03 pm

I managed to get rid off the tach error by disconnecting the yellow & black wire of the tach from the ECU and connected this wire to one of the wires (orange) of the coils. The tach worked perfectly for the first 10 mins of driving, i thought i solved it :drool then the tach died ???? :doh Perhaps i killed it wiring it up this way??

Well its definatley not going to read 8k any more :fire

maybe i should go digital ... any success stories out there one which type to go for ??
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Re: By-passing the fuel sender

Postby emilio67 » Sun Mar 16, 2014 3:14 am

Has anyone successfully connected a standard stock tachometer to one of the coils without ruing it, rather than using wire from the ECU? Was a resister used etc..?

thanks
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Re: By-passing the fuel sender

Postby ddeleon4 » Wed Jul 16, 2014 1:55 pm

I really doubt that just this section of the ECU would get damaged. I'm a computer science major so I have studied this a lot and am fairly confident that if everything else on the bike is working correctly then the ECU is fine.

As for bypassing the system, looking at the wiring diagram it would seem that you would need 2 resistors, one on the connector for the gauges cluster jumping the 2 fuel wires (something low like a 5 ohm) and one at the connector that goes to the fuel sender (the 1k ohm one should be fine here). It may also be possible to jump the bulb with a wire and just use a resistor at the sender connector but you defiantly would need to use something at both connections.

if this works out, let us know. I can imagine that a lot people would be interested.
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