How much should I expect...

Discussion in 'Fuel and Air Systems' started by diymirage, Sep 13, 2017.

  1. diymirage

    diymirage HP@idle > hondaHP@redline FABO Gold Member

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    When I pull the fuel line between the sending unit and the hardline?
    It's been collapsing on me and I want to replace it...should I expect a shower or a drip?
     
  2. 72Dart6pack

    72Dart6pack Well-Known Member

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    Leave the cigar outside the garage before you pull the line off. Whatever is in the hardline will probably drain.
     
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    • Dartswinger70

      Dartswinger70 Well-Known Member

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      I am thinking a bit will come out if the car has been ran recently. if it has been sitting, not much. It is also a low pressure system if carbureted.
       
    • krazykuda

      krazykuda FABO Gold Member FABO Gold Member Technical Editor

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      It will spout like a porno money shot... :eek:
       
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      • 72Dart6pack

        72Dart6pack Well-Known Member

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        I like that answer!
         
      • diymirage

        diymirage HP@idle > hondaHP@redline FABO Gold Member

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        Thanks guys. Do you have any suggestions what to use as a fuel line that will not collapse? Should I use EFI line instead?
         
      • Treblig

        Treblig FABO Gold Member FABO Gold Member

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        I always use a pair of needle nose vice grips to pinch the rubber line before I disconnect the fuel line. This will minimize the mess!! Harbor Freight sells a special plastic pair of pliers just for this job!!

        treblig
         
      • Dartswinger70

        Dartswinger70 Well-Known Member

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        Now if you want a shower, pull the lower radiator hose without draining the radiator, that always cracked me up when flat rate guys "in a hurry" would do that, makes one hell of a mess, and always misses the drain pan ;)
         
      • diymirage

        diymirage HP@idle > hondaHP@redline FABO Gold Member

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        I remember those
        I worked at a shop that used them on brake hoses when replacing the calipers
         
      • 318MoparGuy

        318MoparGuy MoparHokie

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        diymirage...check out my post of Jul. 16 2016 (do search with words....easy fix) about upgrading hose clamps and fuel hoses from regular (R7) to fuel injection hose (R9) and reasoning behind it. I upgraded all the hoses to R9 to head off any possible fuel line problems like you are now experiencing...the aggressive fuels we have today degrade R7 hose pretty quickly. Do it asap before it causes problems in your hard lines and/or carb. Hope this helps you and good luck...318MG
         
      • diymirage

        diymirage HP@idle > hondaHP@redline FABO Gold Member

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        found your post
        interesting read

        so...the R9 hose will not collapse?
         
      • krazykuda

        krazykuda FABO Gold Member FABO Gold Member Technical Editor

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        For 90° bends in my fuel hoses that go to the carb, I take a piece of 5/16" steel tubing and bend a 90° with a tubing bender, then work it into the fuel hose where I want a 90° bend so the line doesn't pinch/collapse on turns etc... The steel tubing lining the hose will keep it from collapsing... It can take a bit to get the tubing where you want it, but you have to work it a little at a time...

        If you put some most of the way or close to where you need just hose alone for the flexibility, then end the tube lining just before that...
         
      • Abodybomber

        Abodybomber Pushing Mopars since 1991

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        So will a pair of honest vice grips, a C clamp.... Crimp the line, either way...Is this a Holley, or AFB/Edelbrock based...?
         
      • diymirage

        diymirage HP@idle > hondaHP@redline FABO Gold Member

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        found out when you pull that line it is barely a trickle
        ive spilled more then that filling up the lawnmower...but then again, i dont usually do that laying on my back

        brilliant...but not applicable here
        well, not completely, i went and grabbed a junk piece of 5/16th fuel line i had downstairs, spend 45 minutes looking for my tubing bender
        then i got under there and found out the main issue was a misalignment of the hard line and the sending unit

        so time well wasted, i got to use my tubing bender (remember, the one i spend 45 minutes looking for) to align the hardline with the sending unit, and now there is a less then an inch gap that the R9 covers

        not sure if this was directed to me or gill, but i was working on the tail end of a duster, which has a proform 750 up front, basically a holley double pumper
         
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        • 318MoparGuy

          318MoparGuy MoparHokie

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          All rubber hoses will collapse/kink if bent tight enough. I was talking about straight runs of R9 hose with no tight bends. When you ask "the R9 hose will not collapse?" I am taking that question to explain that the R9 hose rubber compound is specifically formulated to withstand the ethanol and other aggressive fuel blends that our Mopars have to use today (unless there is an ethanol free gas station by you). If someone were to continue using the R7 hose with ethanol, then that hose would degrade inside and bits of the hose lining would start to break off (and if left alone long enough could cause collapse) and move into the hard line (possibly getting lodged in there) and/or travel into the carb and settling there causing more serious problems. When I changed my R7 hose to R9 hose, I changed all the rubber hose areas from the gas tank all the way to the carb. Don't change the hoses piecemeal, while you're doing it, change them all. There is a Quality Plus gas station in Maggie Valley, NC (next town over from me) that sells ethanol free 93 octane and that's where I fill up my 73 Swinger. But if I am travelling a distance to a car show and are forced to fill up at an ethanol blended gas station on the way back home, then I have the peace of mind that I can use the gas with ethanol and it won't degrade my rubber fuel hoses. I hope this info helps you...did you change the old standard hose clamps and upgrade to FI hose clamps also? My Dad always said "Do it right once and then you don't have to worry about it anymore"....words of wisdom that pertain to a lot of things in Life.
          Take Care,
          318MG
           
        • Killer6

          Killer6 Well-Known Member

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          Much much less likely even with a tight bend, which You should obviously avoid. Almost all current SAE 30R9 hose has a teflon liner inside, which is much more resistant to
          the ethanol content in modern "gasoline", I have used EFI grade hose in all of My cars & projects for others unless doing braided installs. NAPA recalled a run of their EFI
          hose a while ago, it was not lined, manufactured by Gates. I have used said line and not had a failure though.........
          I believe there is also a new EFI SAE hose rating, but it escapes Me at the moment.
           
        • RustyRatRod

          RustyRatRod The New Salty Old Cracker FABO Gold Member Technical Editor

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          Gates makes EFI rubber fuel hose. O'Reilly carries it. It comes on a light green plastic roll. The hose on the black roll is regular carbureted hose.
           
        • Killer6

          Killer6 Well-Known Member

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          Oh, to actually address the original question, it depends on how much fuel is in the tank. If You remove the fuel cap(very important!!) & have the line pinched, You can blow
          thru the line back into the tank as you un-pinch the hose, this will break any siphon effect. If you don't remove the cap, even w/a clear vent, it will be dry for about .4secs.,
          then you will be getting a petrol facial!!! If the level is high, well, plan to drain it or work on it whilst it's trickling steadily.
           
        • diymirage

          diymirage HP@idle > hondaHP@redline FABO Gold Member

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          it turned out it could rebend the steel lines to avoid bends in the rubber hose altogether
          i did forget to buy the EFI clamps, so i used the stock spring type clamps on the inside and then wormgear clamps on the outside


          thanks Rusty, ill keep this in mind next time i need a piece (i had picked up a section before you posted this allready)


          it barely trickled, like i mentioned, ive spilled more filling up the dirtbikes
           
        • Killer6

          Killer6 Well-Known Member

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          Less mess is always the best!! Yeah, I wasn't sure if it was collapsing because the pick-up was getting clogged, or just hose degradation. If the tank was full, and You did
          blow thru back into the tank, You'd be able to tell quickly, but the tank vent(on early A's esp.) will build plenty of pressure just from that to hose You after You stop.