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How can I test fuel guage and any luck buying second hand
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studmuffin
Posted 2016-11-05 12:48 PM (#189669)
Subject: How can I test fuel guage and any luck buying second hand


Fuel gauge has been reading empty and I though today would be a great day to tear it down. It took a while and I now have the fuel gauge on the bench.

Many users have reported issues with the float and my first test was to place the unit it a bucket of water. It floats which is good news/bad news.

I have seen a few second hand units for sale but don't want to buy if i don't need. AND what if it does not work? Most units are from salvage bikes and could be in the same condition.

Can the unit be test with electric meter some how? I have a meter but use it mainly to check wall sockets and batteries.
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rdbudd
Posted 2016-11-05 5:18 PM (#189670 - in reply to #189669)
Subject: RE: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 1632
Jasper, MO
You need to test in gasoline instead of water. Just because it floats in water means nothing. Even if it is saturated with gas, it will still float in water since gas is lighter than water.

I would bet that your float is saturated with gas. A new float will fix it if that is the case.

You can test the operation of the gauge sender with an ohmmeter. Check it, (pins C and D) and if it moves smoothly from 50 ohms at full to 250 ohms at empty position, the sender is good. Back to the float.

Ronnie

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johnnyvision
Posted 2016-11-05 6:20 PM (#189671 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
the gauge gets the signal from the pump and float. You can use a Ford model A float. ( make sure you ask for clip that holds float in place). He right about testing in gas,
You have to tear the right hand side a part to get at fuel pump. By the way there is no fuel filter to replace. Vision use a car pump but I don't witch one.
There is a locking clip that hold float in place. You have to get gasket from dealer P/N 5413012
When you put fuel pump back in you have to push down hard on pump to get bolts started. Make sure you have less then 1/2 tank. You'll not lose any gas.
It take most of the day to do it.

http://www.mikes-afordable.com/product/A9313B.html
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johnnyvision
Posted 2016-11-05 6:21 PM (#189672 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
found photos of tank



(13043373_1682823275315117_3061663093057314058_n.jpg)



(12993407_1226531304041117_2550518814405636861_n.jpg)



(IMG_20160715_123223992.jpg)



(IMG_20160715_144802937_HDR.jpg)



Attachments
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Attachments 13043373_1682823275315117_3061663093057314058_n.jpg (120KB - 3 downloads)
Attachments 12993407_1226531304041117_2550518814405636861_n.jpg (23KB - 1 downloads)
Attachments IMG_20160715_123223992.jpg (34KB - 0 downloads)
Attachments IMG_20160715_144802937_HDR.jpg (70KB - 0 downloads)
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johnnyvision
Posted 2016-11-05 6:23 PM (#189673 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
here are more



(open hole.jpg)



(IMG_20160715_134700015.jpg)



Attachments
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Attachments open hole.jpg (225KB - 0 downloads)
Attachments IMG_20160715_134700015.jpg (235KB - 0 downloads)
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johnnyvision
Posted 2016-11-05 6:41 PM (#189675 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
yes you have a bad float.



(what-is-a-fuel-pump.jpg)



Attachments
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Attachments what-is-a-fuel-pump.jpg (56KB - 0 downloads)
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rdbudd
Posted 2016-11-06 7:53 AM (#189677 - in reply to #189670)
Subject: RE: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 1632
Jasper, MO
I would add that not only was testing the float in water a pointless exercise that proved nothing, if you have had the float out of gas for a couple of days, the gas that it was permeated with has probably evaporated by now and it will now float in gas---until it gets saturated again.

You have it apart, Just put a new float on it if the ohmmeter test says it is good.

Ronnie
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studmuffin
Posted 2016-11-06 8:29 AM (#189679 - in reply to #189669)
Subject: RE: How can I test fuel guage and any luck buying second hand


Thanks for the tips. I hooked up electric meter and it appears to be a bad float. I was close to buying a second hand unit but feared it could be in poor condition. If it too was bad, it would have worked a few days, then sank. Do not want to start over.

Removing the unit is not a difficult task and requires few tools. Metric alan wrench, 5mm socket and a few others Having said that, it is time consuming but my time is cheaper than a garage.

When using the meter it is important to measure with the float in the up and down position. A bit tricky to hold the meter, the probes, the float and keep the pump steady.

Now time to repair the float issue. Thanks to all for the instructions.

Attaching photos of electric meter outputs.



(prob these two.jpg)



(fullTank.jpg)



(nearEmptyTank.jpg)



Attachments
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Attachments prob these two.jpg (48KB - 0 downloads)
Attachments fullTank.jpg (55KB - 1 downloads)
Attachments nearEmptyTank.jpg (52KB - 0 downloads)
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johnnyvision
Posted 2016-11-06 5:48 PM (#189680 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
to get that clip off the end of the float I used a kitchen fork

Good Luck To You
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studmuffin
Posted 2016-11-28 7:04 AM (#190101 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


I tried to sold a brass float to the stainless and found a bit of a challenge. First challenge was find a float as all cars now are fuel injected. Instead i used Stewart Warner 385b-f fuel sender. Some on one of the posts had used similar Stewart part. This was much easier than soldering. I put a few bends, cut off a couple of inches and done.
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johnnyvision
Posted 2016-11-28 6:38 PM (#190104 - in reply to #189669)
Subject: Re: How can I test fuel guage and any luck buying second hand


Visionary

Posts: 4278
did I post this http://www.mikes-afordable.com/product/A9313B.html
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