The fuel gage reads full and I have taken out the sending unit and checked it and it seems to work freely. After I put it back in the tank the gage read empty but after I put in about 6 gal. of gas it jumped to full.
I repalced the sending unit a while back could it be that the float is too short or the wrong unit.
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Re: Fuel gage not reading properly
Yes it could be you need to check the depth of your tank and then measure the sending unit to see if is going to the bottom it should be about a 1/4 inch from the bottom if that is good change the gauge
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It could be a loose connection on the gauge or the fuel sending unit. The fuel sending unit can get worn and have breaks in the contact area that is used to determine float position to send the fuel level reading to the gauge. I suspect that you have problem with the fuel sending unit considering that the light is on. I am assuming that the light that is on is the "low fuel light". Check your connections at the sending unit if the connections are secure then I would suggest replacing the fuel sending unit.
Testing the fuel gage requires accessing the harness from the fuel pump and grounding the yellow / white wire with 160 ohms resistance this should cause the gage to read full, and with the circuit open you should have the gage reading empty. If the gage works in this order then the likely failure is the sending unit in the tank , and will require replacement.
Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.
It sounds like the fuel level sending unit located on the fuel pump is malfunctioning. The solution for this is to have it replaced. You can do this yourself but I wouldn't recommend it as the vehicle needs to be lifted and the fuel tank needs to be dropped out. This can be preformed for about 100-150 in most shops.