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Username Post: gas tank grounding        (Topic#348385)
66 Blu panel 
Contributor
Posts: 831

Loc: B.C. Canada
Reg: 10-19-03
11-25-17 08:46 PM - Post#2715725    

My understanding of how the fuel gauge works: Power is sent to the sender and the voltage is read at the gauge. The voltage is varied by the float.

Does the gas tank need to be grounded in order for the gauge to work?



 
bobschevytrucks.com Ecklers

Shepherd 
Frequent Contributor
Posts: 1227

Loc: Lake George, NY
Reg: 11-11-15
11-26-17 05:45 AM - Post#2715754    
    In response to 66 Blu panel

Yes, to complete the circuit.



 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4110
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
11-26-17 06:11 AM - Post#2715760    
    In response to 66 Blu panel

Hi BLU66, sort of. The power feed normally goes from the key to the gauge, sometimes it will have an interrupter to dampen the gauge and then the gauge is earthed through the sender. (This is called earth switching.)

This is safer, but it requires that the fuel tank is earthed to the chassis. If you put in a poly tank then you need an earth lead on the sender unit to the frame.

If your filler is not part of the tank, like on a lot of boats, then you should earth the filler neck to the tank and chassis as well. You do not want the friction of the fuel in the pipes while filling to cause static electricity.

If you have ever seen a small plane being refueled or a petrol tanker unload you will appreciate that this is good science, not urban legend.

Cheers Kiwi

  • Quote:
Just in case you might need this...

Kiwi to American Translation:
Petrol = gasoline or fuel
Earth = ground

hope this helps!

Thanks for your help Clive! Good on ya mate!

--Hilandr



48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

And when it was laid to waste, they called it peace.


Edited by hilandr451 on 12-05-17 12:00 PM. Reason for edit: No reason given.

 
66 Blu panel 
Contributor
Posts: 831

Loc: B.C. Canada
Reg: 10-19-03
11-26-17 10:36 AM - Post#2715785    
    In response to Bel Air kiwi

Thanks for the replies. Filler neck is metal and screwed to the metal body, but, there is a thin layer of roofing tar between the two mating surfaces to prevent rust. I might have made the evening news:

OLD TRUCKS BURNS TO THE GROUND!



 
hilandr451 
Valued Contributor
Posts: 3832
hilandr451
Age: 55
Loc: Anna Texas
Reg: 01-02-02
12-05-17 11:48 AM - Post#2716955    
    In response to 66 Blu panel



-The Hilander.
Silver 2017 Silverado 1500 double cab 2WD 5.3L
"Rattle can primer red" 1966 C20 Custom Camper 5.7L, 700 R4 trans 410 diff. front disc, p/s
Project Pics


 
66 Blu panel 
Contributor
Posts: 831

Loc: B.C. Canada
Reg: 10-19-03
12-20-17 07:41 PM - Post#2718619    
    In response to hilandr451

Thank you for the diagram.



 
hilandr451 
Valued Contributor
Posts: 3832
hilandr451
Age: 55
Loc: Anna Texas
Reg: 01-02-02
12-21-17 11:46 AM - Post#2718668    
    In response to 66 Blu panel

why, you're welcome sir!

-The Hilander.
Silver 2017 Silverado 1500 double cab 2WD 5.3L
"Rattle can primer red" 1966 C20 Custom Camper 5.7L, 700 R4 trans 410 diff. front disc, p/s
Project Pics


 
bobschevytrucks.com Ecklers

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