Question about 1987 Volvo 740

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Gauge is not showing the gas amount in the tank it does not move at all when fueling always stays on E

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  • Volvo Master
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Most likely the fuel sending unit in the tank,but to test it unplug the unit from the tank,the gauge should go to full,if it does not,then the sending unit in the tank is bad.

Posted on May 14, 2010

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Posted on Jan 02, 2017

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My polo 1.4 se's fuel gauge has sat on 3 quarters for 3 days now, not normal with the amount of driving I do daily, what could be causing the problem? It changes a bit when on a slope though


Hi Josh:
I'd start by completely filling the fuel tank.
Since you know how far you usually can go on a full tank, when you have gone about alf that distance, the gauge should show about half a tank, and when you've gone just over 3/4 of that distance, the gauge should be starting to show on the low side.
At least, if you know that the gauge is not reading correctly, you won't run out of gas if you keep track of the distance and always fill the tank completely.
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Sounds like you have a bad sending unit in your gas tank. You will need to take it to a mechanic to get checked. This isn't really a do it yourself type repair since it involves removing the gas tank.

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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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