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How sensitive is the pump to running out of fuel?

Discussion in '1st Gen 4Runners (1984-1989)' started by Daved_and_Confuzed, Feb 13, 2020.

  1. Feb 13, 2020 at 1:41 PM
    #1
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    Everybody seems to think my problem is bad gas. my plan was to let the truck idle itself out of gas, replace the fuel filter, and fill with 5 gallons of good gas. will running the truck out of gas harm the fuel pump? i know if you ran out of gas in a ford explorer it would likely burn up the pump and not want to start again.
     
  2. Feb 13, 2020 at 1:50 PM
    #2
    Dillusion

    Dillusion New Member

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    If you are low why not just siphon the rest out?
     
  3. Feb 13, 2020 at 2:02 PM
    #3
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    im not terribly low, i have just under a half tank, about 5 gallons i estimate
     
  4. Feb 13, 2020 at 3:58 PM
    #4
    Dillusion

    Dillusion New Member

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    idling on 5 gallons of gas I can't imagine how long that will take.

    I'd personally siphon it out.
     
  5. Feb 13, 2020 at 5:21 PM
    #5
    fajitas21

    fajitas21 New Member

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    Honestly it's probably not going to hurt it to do it once or twice but the effort of siphoning will ensure no damage.
     
  6. Feb 13, 2020 at 11:33 PM
    #6
    PhantomTweak

    PhantomTweak New Member

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    None. Bone Stock. EXCEPT: Brushguard, tow hitch, both welded to the frame. It's good to have friends and a fully equipped garage!
    I ran my pickup out ONCE. It's got the mechanical fuel pump though. I did it to see exactly how far I could drive it after the FUEL lite came on steady. 13 miles city is what I got. I've never run the 4Runner below a quarter (on the gauge, for what that's worth...), since it has the in-tank electric pump.

    It really IS a bad idea to run the tank dry, especially just idling, as the pump is cooled by the fuel, and sitting there idling with the fuel getting low, it would get pretty hot. Good chance for it to burn out.

    I'm goin to cast my vote for siphoning too. It would be a MUCH safer way to empty the tank. Absolute worst case, drop the tank, and dump the fuel out. You can look inside, with a flashlite, NOT a match, ahem :sorry:, and SEE if there is contamination in there. Whether dirt, water, whatever, and get rid of it. If there ISN'T, you can put the gas back in, thus saving yourself the cost of 5 gallons.
    If there IS dirt, you can probably get about 80-90% of it out by straining it a ladies nylon.They're actually a pretty good filter medium. Double or triple them over, and you have a super tight filter medium.

    Good luck, no matter what you do!
    Pat☺
     
  7. Feb 14, 2020 at 5:25 AM
    #7
    DGP1961

    DGP1961 New Member

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    You do not need to run it totally out just drive it till your REALLY low like hovering on E then go fill up with super or whatever you were going to put in. The amount of a total fill compared to what you will have left in the tank isn't worth talking about.
     
  8. Feb 14, 2020 at 5:25 AM
    #8
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    good advice as idling it for 8 hours only brought it from 1/3 of a tank to 1/4 of a tank. it would probably have to idle for 24 hours, at least, to burn through all its gas.

    it was running really good though before i shut it off. it wasnt missing at all!
     
  9. Feb 14, 2020 at 7:36 AM
    #9
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    it wont drive, it misses and sputters when giving it throttle. it will idle fine once warmed up but is a bitch to keep running when cold. my plan is to move it into my garage and open up the access panel underneith the seat and take a look into the tank. i was having this problem with less severity on the last tank and i filled my 14.4 gallon tank with 12.9 gallons of shell gas so im skeptical that its really bad gas...im just running low on ideas. maybe i have a bad tank, well see once i can get in there
     
  10. Feb 14, 2020 at 6:13 PM
    #10
    NightOwl

    NightOwl 1985 Toyota 4 Runner DLX 22REC

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    LCE header, 2.5 inch exhaust, 31x 10.50 BF Goodrich, 15 X 8 aluminum wheels, Bilstein Shocks, 3 inch lift kit, 3M fender flares
    I'm a firm believer in running it low...add some Lucas stabilizer and ethanol neutralizer and of course being me...add 4 ounces per 10 gallon of Marvel Mystery oil...I know...snake oil shit but it works and works well...the Marvel oil will clean and lubricate every thing even the fuel pump and possibly reduce or eliminate some carbon deposits which these older engines are prone to...I have used both Lucas and Marvel in my 85 4 Runner and it runs Great...then fill it up
     
    Last edited: Feb 14, 2020 at 6:18 PM
  11. Feb 14, 2020 at 6:15 PM
    #11
    NightOwl

    NightOwl 1985 Toyota 4 Runner DLX 22REC

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    LCE header, 2.5 inch exhaust, 31x 10.50 BF Goodrich, 15 X 8 aluminum wheels, Bilstein Shocks, 3 inch lift kit, 3M fender flares
    Additionally...put a screw into the vacuum hose on your EGR...crazy as it sounds it may fix everything...it did mine...
     
  12. Feb 16, 2020 at 7:28 AM
    #12
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    where my egr at? lots of vacuum lines under here
     
  13. Feb 16, 2020 at 10:45 AM
    #13
    NightOwl

    NightOwl 1985 Toyota 4 Runner DLX 22REC

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  14. Feb 16, 2020 at 10:47 AM
    #14
    NightOwl

    NightOwl 1985 Toyota 4 Runner DLX 22REC

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    Sorry...my reply was only pictures...this is the EGR valve at the back of the intake manifold next to the fire wall...just unplug this hose and put a screw in it and I put a rubber cap over the actual EGR valve port...please let me know if this helps
     
  15. Feb 17, 2020 at 3:17 PM
    #15
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    excellent! ill try it. today when i put a fuel pressure gauge on it it was reading less than 1psi so i ordered a pump. im hoping it was just a pump
     
  16. Feb 17, 2020 at 3:24 PM
    #16
    Daved_and_Confuzed

    Daved_and_Confuzed [OP] New Member

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    looks like we got the same truck, homie
     
  17. Feb 17, 2020 at 3:37 PM
    #17
    NightOwl

    NightOwl 1985 Toyota 4 Runner DLX 22REC

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    It does...Great trucks that just keep on going!!!
     

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