 Problem with fuel gauge., Shows only 1/4 full. |
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| daytona |
 Feb 4 2018, 03:48 PM
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daytona  Group: Members Posts: 475 Joined: 13-April 14 From: Ormond Beach, Florida Member No.: 17,249 Region Association: South East States  |
Hi world,
I need some help with the fuel gauge in my 74. The car is a 6 cylinder conversion but I don't think that this factor contributes to the problem. The issue is that the gauge shows that the tank is 1/4 full even though it is full to the top. I have two other gauges that I tried and both show the same 1/4 tank level. In my book this would indicate that the sending unit is the culprit. Couldn't be that all three gauges have the same defect. However, measuring the voltage at the gauge, I get 12.4VDC. I think this means that the sending unit is sending the correct signal. So where is the problem??? Has anyone had this problem? Any ideas? Any and all help is appreciated. Thanks, Bill. |
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| daytona |
Feb 4 2018, 04:01 PM
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daytona Group: Members Posts: 475 Joined: 13-April 14 From: Ormond Beach, Florida Member No.: 17,249 Region Association: South East States |
dr914, OK thanks.
So you are saying that as the float goes up, the resistor should send less volts? Essentially empty = 12V, and full = somewhat less then 12V ? Thanks, Bill. |
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| dr914@autoatlanta.com |
Feb 4 2018, 04:07 PM
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914 Guru Group: Members Posts: 8,223 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
0-90 ohms resistance to the gauge, When it gets stuck nine times out of ten it is the sliding float, once in a while the wire breaks and then you can solder it back together
QUOTE(daytona @ Feb 4 2018, 03:01 PM)  dr914, OK thanks. So you are saying that as the float goes up, the resistor should send less volts? Essentially empty = 12V, and full = somewhat less then 12V ? Thanks, Bill. |
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Posts in this topic
daytona Problem with fuel gauge. Feb 4 2018, 03:48 PM
dr914@autoatlanta.com Remove the sending unit, take it apart, and clean ... Feb 4 2018, 03:50 PM
GeorgeRud The sender is basically a variable resistor, so yo... Feb 4 2018, 05:38 PM Tbrown4x4 Some of your terminology is off, so hopefully this... Feb 5 2018, 06:01 AM daytona Hi guys,
I removed the sending unit from a spare t... Feb 5 2018, 03:40 PM daytona Anybody?
I removed the small nut on the bottom of ... Feb 5 2018, 05:25 PM Olympic 914 Yes. remove the little nut on the bottom, carefull... Feb 5 2018, 05:34 PM daytona I have not been able to take it apart yet. I have ... Feb 5 2018, 06:41 PM windforfun You can get a brand new OEM Bosch unit for about ... Feb 5 2018, 06:48 PM Tbrown4x4 I just had mine apart, and I don't remember ha... Feb 5 2018, 08:52 PM PanelBilly I bought a new one from Sunset Porsche. It’s s n... Feb 5 2018, 09:07 PM daytona Hi again guys,
Last knight I was just being an idi... Feb 6 2018, 12:16 PM The Cabinetmaker Your connectors should be in a plug that only plug... Feb 6 2018, 12:38 PM daytona Cabinetmaker,
Yes, that is the plug at the sending... Feb 6 2018, 06:34 PM Mike Fitton Here you go.
Feb 6 2018, 07:09 PM daytona Thank you Mike.
Bill. Feb 7 2018, 06:17 AM Morrie Hi Guys,
My connector at the sending unit was bro... Feb 7 2018, 09:57 AM
daytona Hi all,
fuel gauge problem solved. As several of y... Feb 11 2018, 06:12 PM |
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