Drove from jersey to philly on 0 to empty. They really mean eco lol

Discussion in 'Generation 4 - General Discusson' started by Shokev, Apr 8, 2020.

  1. Shokev

    Shokev SHO Member

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  2. yaycandy

    yaycandy SHO Member

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    They usually recalculate then when you fill up it will say more miles then it did before. I do that on all my newer cars, run them empty and then fill it up with a can. Then when you fill the tank the miles is usually closer to right
     
  3. ridered74

    ridered74 SHO Member

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    You have about 2 gallons left when it hits zero. Not advisable to let it get that low tho for multiple reasons.
     
  4. SM105K

    SM105K Streetlight Grand Prix Champ

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    This....bad things can happen. It has been shown that our fuel injectors stick with low fuel pressure.
     
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  5. luigisho

    luigisho SHO Member

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    Also water and sediments collect at the bottom.
     
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  6. PaulTAutoX

    PaulTAutoX SHO Member

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    Not poking at you personally - I have always heard this quoted.
    But where is the water if it's in a gas tank? /Always/ at the bottom. Same as sediment. That's where the fuel pickup is, at the lowest point so you can use all of the gas.

    Has anybody here opened up a gas tank and found a big mountain of sediment there?
     
  7. SM105K

    SM105K Streetlight Grand Prix Champ

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    On a newer SHO no, on a 80's Fox Body yes.
     
  8. luigisho

    luigisho SHO Member

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    Depends on the car and where you fuel up. On older cars that I only really need to dig into the gas tank? yes enough to notice.
    Also enough to require a straining sock or more recently the fuel filter itself on the intake of any fuel pump I have seen in 30yrs. Why is it on there? You don't need a mountain of sediment to damage a fuel pump, fpr or fuel injector just enough to do the job. YMMV
     
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  9. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Water is heavier that gas, it would be at the bottom. But the fuel pump is lubricated by the fuel. If you let it pull in air, you are wearing parts more excessively than needed.
     
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  10. jgonza5

    jgonza5 Member

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    Correct me if I am wrong...

    The fuel in the tank essentially cools the fuel pump. The more fuel in the tank, the better cooling; less fuel = lesser cooling. (Second Law of Thermodynamics at work)

    As a full tank of fuel is consumed, the temperature of the fuel begins to increase slightly (obviously ambient temperature, exhaust heat, etc. contribute too) and vaporize. (This is normal)

    However, when nearly empty, there is less fuel volume to absorb the heat generated by the fuel pump. This allows the remaining fuel's temperature to greatly increase and vaporize even more.

    Like skyshadow stated, the problem is that when the tank is extremely low on fuel, the exposed pump/screen is now pulling some air/vapor, which causes Pump Cavitation, and leads to premature failure.

    Don't worry if you run it down to nearly empty once or twice. Just don't make a habit of it.
     
  11. yaycandy

    yaycandy SHO Member

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    I wouldnt be too paranoid about it. Sucks up air dosnt meet hpfp requirement and engine shuts off. Pump wont fail if it runs all day sucking air to say the least. And i bet it still wont fail as they are engineered for well beyond that as normal pumps can barely last 15mins. Look into the engineering on the in tank pump once.
     
    Last edited: Apr 18, 2020

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