Don't push that button!

ProbablyBroke

ProbablyBroke

does not torque to spec
Joined
Nov 7, 2012
Location
Reidsville
I bought a 1995 f250 with the 7.3 last year. When I asked the previous owner if both fuel tanks worked, he stated that he never used the rear tank because he only drove it around town and to the boat landing. I believe him. Who knows. I think he owned the truck for 4 or 5 years. Since I have had the truck, I have only run fuel from the front tank. I'd like to be able to run both tanks or at least know the rear works / is clean. This truck paranoias the shit outta me. What would you do before/after you tried the rear tank?
 
Got a fuel filter? Whats the risk of trying it? If the fuel is gummed up, it won't flow. If its bad fuel , the truck won't run as well but you'll know everything else works. Try it!
 
Do it and report back...


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ProbablyBroke said:
May be too soon to be conclusive. Flipped the switch. Watched the fuel needle drop to about a 1/4 tank. Took her for a spin to Lowes. All I can say for certain is that she did not explode. Yet.
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If the gauge works for both tanks, you've found a unicorn. My dad and I have owned 6 Fords with dual tanks through the years, and NEVER had one where BOTH sending units work.
 
Are both tanks 20 gallon? If I start getting close to E on the front tank , it will usually only take 15 gallons to be full. What I found online said dual tanks were 20 gallons each.
 
ProbablyBroke said:
Are both tanks 20 gallon? If I start getting close to E on the front tank , it will usually only take 15 gallons to be full. What I found online said dual tanks were 20 gallons each.
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Every time I fill up when on E I get between 30-32 gallons between the two tanks.
Tanks are 18 or 19 gallons each when dry though.
I am also driving a unicorn apparently.


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My 90 both tanks are 19 gallons. That's running them until they hiccup and then switching on the fly. I can get an extra gallon in the rear tank mainly into the connector hose if I leave the truck running while fueling
 
I just did the same to my 96 after it sat for a few years. A couple things will happen if you try it 1) You'll find out it works 2) You'll find out it doesn't work 3) If #2, it'll either be a gummed up tank, that you'll be dropping $300ish on for tank and all accessories, or the switch itself is bad, or the selector valve will be bad.

Mine ended up being a gummed up tank. Also a 460 instead of a 7.3 though.
 
I ran the rear tank down as far as my nerves would let me. Got to the gas station and she took 14.3 gallons. I don't know if this truck even has a low fuel light. I treated the fuel with crc fuel therapy and intend to change the filter once I run a few hundred miles. I did get a little hasty and push the tank selector button through the dash.
 
My 96 never held more than 15 in the back, even though all the literature I found said it was bigger than the front tank. My front tank usually held about 19.
 
As usual, I spoke too soon. Up until the beginning of this week, I had never noticed an fuel leaking under the rear tank. Went ahead and dropped the spare tire and planning to drop the tank to investigate. Probably get frisky with a few cans of rustoleum while I'm under there.
 
ProbablyBroke said:
I ran the rear tank down as far as my nerves would let me. Got to the gas station and she took 14.3 gallons. I don't know if this truck even has a low fuel light. I treated the fuel with crc fuel therapy and intend to change the filter once I run a few hundred miles. I did get a little hasty and push the tank selector button through the dash.
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The standard in OBS trucks is 15 rear, 19 front.
 
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