Question about Harley Davidson FLSTFI Softail Fat Boy Motorcycles

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My gas gauge on my 2005 softtail reads empty only 60 miles into a full tank, then after another 50 miles or so then it works accurately again. What's the problem, how do I fix it.

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I would make sure that the wires are not grounding out

Posted on May 23, 2011

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Its very simple. If the gauge is showing half full then fill the tank and see how much fuel it takes. If the amount you add is approximately 50 percent of the fuel tank capacity then you know the fuel gauge is accurate . In that case the computer is giving an inaccurate reading and should be ignored. All you need is an accurate fuel gauge - it does not matter a row of beans what the computer says if the fuel gauge is reading correctly.

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My gas gauge goes to full when i fill it up but in the middle of driveing 60 miles it always falls to empty and stays there theres no inbetween help please......... this problem is on my 87 toyota 4x4...


The fuel sending unit in the tank is going bad,it is a float,and it is failing,to repair,it must be replaced,removal of the tank is required.

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Fuel gauge is erratic. When tank is full, it reads empty. Eventually it settles in to more accurate reading?????


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Fuel gauge not working on 2005 ford mustang


Sending unit is in gas tank. usually as an assembly with the electric pump. These aren't cheap either, If you know a mechanic you can trust ask him how much to install a new one, I can get them wholesale for less than two hundred dollars, but of course retail probably more like 250.00 Hope this helps you!

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1 Answer

1989 Saab 900 low level fuel light


You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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