Question about BMW 318

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Fuel gauge does not work. Always shows as empty with yellow warnuing light showing, car is BMW 316i 1997/8. R Prefix registered, 4 door

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  • BMW Master
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Take the sender unit out of the tank and check it out ,check for a feed to the sender unit its a piece of white porcelain with a printed circuit on it ,the fuel pump is also built into this unit as wel

Posted on Nov 09, 2010

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Why won't the fuel gauge work?


The power wire from the sending unit runs to the gauge. Since it is showing 3/4 all the time. It is a break in the wire or really high resistance. I would check resistance of the ground wire first. If it is good(less than 5.0 ohms), I would replace the power wire from the pump to the gauge. I assume the gauge goes to empty with the key off. If not the gauge is bad.

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Fuel gage showing half a tank but trip computer only registering 60 miles left


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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I have bmw 316i (98)not picking up speed like it should be. there is no engine light on on the panel,few days ago i disconnect the abs sensor because it show always light on the cluster after reset its ok...


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FUEL GAUGE AND LIGHT STAYS ON NEARLY EMPTY AFTER PUTTTING IN PETROL.WHATS THE MOST LIKLY FAULT. DODGY GAUGE OR FLOAT IN PETROL TANK.THANKS FLYNN.


Do you mean that the gauge registers as empty, even after the tank is filled? Probably the sending unit needs to be replaced (it's in the tank, likely partially attached to the fuel pump).

Jul 27, 2008 | 1997 BMW 318

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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