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Dumb ?: Which tank in which? Aux / main?

 
  #1  
Old 12-23-2005, 02:01 PM
riley3d
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Unhappy Dumb ?: Which tank in which? Aux / main?

On a 79 F150. One of the sending units does not work and I am confused with out a manual.

Thanks
 
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Old 12-23-2005, 02:03 PM
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looks like this



A
U
X



MAIN
 
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Old 12-23-2005, 02:07 PM
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Thanks. So the Aux is the front tank and Main is rear. Time to use the Sharpie.
 
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Old 12-23-2005, 03:04 PM
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Not so fast, the rear has always been the Aux on every one I have owned, (5) Maybe there are different ones out there. Your fuel tank selector switch should say "Rear" (up position) and "front" (down position). In 1978 models the swith is labeled "Aux"-up and "Main"-down. Anyone else??? -Dale
 
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Old 12-23-2005, 03:13 PM
riley3d
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Time to get the lacquer thinner out....nah.

My switch says Aux on the top and Main on the bottom.

I will wait for the consensus.
 
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Old 12-23-2005, 03:16 PM
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up is rear down is front for me
 
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Old 12-23-2005, 04:15 PM
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I've got a 78, on my way home from picking it up, I ran out of gas (which was frightening cuz I just filled both tanks up) I flipped the switch, but evidentally it didn't matter. we stopped for gas and it looked like the rear was main, so I poured in my couple of gallons and couldnt start it up. we went back and this time filled the middle tank. to which it fired right up...the moral of the story is ....??? I dunno, it looks as though the rear would've been the main, but I think somebody hillbilly fixed it
 
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Old 12-23-2005, 05:24 PM
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I've been told that the front tank is the main and the rear is the aux. On my dash the switch in the down position is the main tank and the up is the aux.
 
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Old 12-23-2005, 09:38 PM
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I have a 77 shop manual. It refers to the miship tank(side mount) as the auxiliary tank.

I would suspect since all trucks have a rear tank(main) that the optional side tank should be the aux.
 
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Old 12-23-2005, 10:36 PM
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The rear tank should be the main tank.
 
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Old 12-23-2005, 10:46 PM
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On my 77, The Main was the tank behind my seat and when i turned it over to AUX the gauge started reading the Rear Tank.
 
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Old 12-24-2005, 12:40 AM
roan65
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my 78 f-150, main is the rear.
 
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Old 12-24-2005, 01:27 AM
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in my 78 aux is the rear. I wonder if the switch is upside down?
 
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Old 12-24-2005, 01:32 AM
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the rear tank between the rails is the main always has been always will be. the aux is the frame mounted one.
 
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Old 12-24-2005, 05:57 PM
X36
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Hi I can only speak for myself,but I have 2 1978 4wd supercabs and I checked them both before writing this.On both the rear tanks are marked AUX and switch is in the up position.Hope this helps
 

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