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Been asked before ....

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Old Aug 8, 2021 | 08:14 PM
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Vinford's Avatar
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Been asked before ....
This has probably been asked a bunch of times but couldnt find it doing a search?
Back tank , front tank?
which is main , which is aux?
 
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Old Aug 8, 2021 | 09:24 PM
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IAW the OM (owners manual)




1976 F100 thru F350, P & M Series Owners Manual
It could be Ford switched Main/Aux designations in 1977. Rear might have become the auxiliary then.
1976 Owners manual shows below:

 
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Old Aug 8, 2021 | 10:38 PM
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https://www.ford-trucks.com/forums/1...nk-switch.html
https://www.ford-trucks.com/forums/4...-aux-main.html
 
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Old Aug 8, 2021 | 11:26 PM
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That is super funny. He knows it's been asked before, because he did it.
 
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Old Aug 8, 2021 | 11:29 PM
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I went and read post from 2005 it gave me a headache lol
 
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Old Aug 9, 2021 | 07:09 AM
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Run one tank empty and fill the other one and look at the fuel gauge?
 
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Old Aug 9, 2021 | 10:04 AM
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Originally Posted by Vinford
I went and read post from 2005 it gave me a headache lol
Yep, I think there is a post somewhere with two different versions of the owner's manual that describe it both ways...glad mine is marked Front/Rear!
 
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