 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: 467 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 6 2018, 12:16 PM
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daytona Group: Members Posts: 467 Joined: 13-April 14 From: Ormond Beach, Florida Member No.: 17,249 Region Association: South East States |
Hi again guys,
Last knight I was just being an idiot but I did finally figure out that the tube separated from the top mounting. Attached are some photos of the inner part of the sending unit. To me it looked absolutely clean. The center pole was shiny like polished stainless, and the three wires were intact. The float moves freely and when I measured the resistance again now it read 70 Ohms at empty and 6.4 Ohms in the full tank position. The thing is that this sending unit was also showing 1/4 tank even when full. I am beginning to think that the wires are in the wrong position at the gas gauge. Can anyone confirm the correct position of the wires at the gouge? I looked at the factory shop manual electrical diagram but it does not show which prong each wire connects to. 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 daytona dr914, OK thanks.
So you are saying that as the fl... Feb 4 2018, 04:01 PM
dr914@autoatlanta.com 0-90 ohms resistance to the gauge, When it gets s... Feb 4 2018, 04:07 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 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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