Fuel gauge still not working, What am I missing? |
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Fuel gauge still not working, What am I missing? |
john77 |
Mar 27 2014, 02:24 AM
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#1
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Senior Member Group: Members Posts: 621 Joined: 21-February 14 From: Los Angeles Member No.: 17,027 Region Association: Southern California |
With the ignition on the needle on the gauge lifts to E but goes no further despite the tank being full.
I pulled the sender, wired up a new ground and hooked up a new wire from the gauge to the sender and tested the sender manually by turning it upside down and then back. The needle goes from empty to full and back to empty. Just to double check I test the resistance, 0.2 ohms right side up, 89.9 ohms upside down (the range is 0-90 ohms). So I put the sender back in the tank with the new wiring, switch on the ignition and... the needle rises to E and goes no further. So I think maybe, somehow, the floats not lifting. So I pull the sender, fill a bucket of water, dip it in, and the needle on the gauge rises and tells me I have half a tank - or less or more depending how much I submerge it. In other words, the damn thing is working. So I put it back in the tank and nothing, the gauge rises to E and stays!!! What the hell am I missing here? It works in a bucket of water but move it a foot and put it in my gas tank and nothing. John |
stugray |
Mar 27 2014, 09:20 AM
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#2
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Are there two wires coming off of the sender unit (G and GND?).
Or does the sender unit ground through the tank? |
john77 |
Mar 27 2014, 11:30 AM
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#3
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Senior Member Group: Members Posts: 621 Joined: 21-February 14 From: Los Angeles Member No.: 17,027 Region Association: Southern California |
Are there two wires coming off of the sender unit (G and GND?). Or does the sender unit ground through the tank? The sender has two wires coming off it, one that grounds it (I've rewired it to the ground under the dash by the fuse panel) and the other goes to a terminal on the gauge - these are aftermarket, not standard 914. Just learned the dialectric constant of water is way higher than gas, so my water test was pointless.. who knew (IMG:style_emoticons/default/smile.gif) I know the sender has a good ground and the gauge to sender wire is good as I just rewired both, and I know the gauge is getting 11.8V with the ignition switched to ACC, so I guess, seeing as it's the only thing I haven't rewired, next thing is to rewire the ground to the gauge... |
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