Coremouse Posted April 20, 2017 Share Posted April 20, 2017 My car is 99 Corolla, gas tank rusted from inside and not worth repairs, after getting one decent used tank in Siang Gong Soi I tried to get the fuel tank off( I've replaced tank in similar Corolla ), after years of aging and use, this Corolla's fuel line threads( similar to "FUEL LINES" pointed in the attached pic ) really doesn't want come off, wrench, vise grip, extension bar, everything failed to loosen them. I dare not heat up the fuel line, also these 8mm or 5/16" whatever piping are indeed very fragile. I cut off the fuel line to get the rusted leaking tank off, now I could use my 1/2 IR impact driver, even this tool couldn't bust them in half-setting, set to full torque and finally got the threading off, found there isn't any painting nor glue nor sealing as I suspected, just nasty oil residues. Wonder if there's proper way to deal like this situation? Now have to make my new fuel line... I have pipe bender and taper presser for the work, wonder where could I buy some 2m length fuel pipe, Vorajak perhaps? Link to comment Share on other sites More sharing options...
kartman Posted April 20, 2017 Share Posted April 20, 2017 Fuel lines in the picture generally don't come off they are part of the fuel pump assembly Link to comment Share on other sites More sharing options...
Coremouse Posted April 20, 2017 Author Share Posted April 20, 2017 I mean this connection... due to failed attempts by vise grip and air wrench, loosen torque is well above 250 Nm, granted Seems very common issue, I remember my last success with a different Corolla is by two vise grips and two steel tubing Link to comment Share on other sites More sharing options...
Coremouse Posted April 20, 2017 Author Share Posted April 20, 2017 It may looks a harmless 1/2" thread, but as firm as one 32mm castle nut of wheel bearing! Link to comment Share on other sites More sharing options...
canthai55 Posted April 21, 2017 Share Posted April 21, 2017 You will have to heat the flare nut. Years of exposure to road dirt has packed the space between the inside of the flare nut and the steel tubing with fine sediment. Remove the in tank fuel pump assembly, blow dry it and Blow the fuel line clear of fuel first. No danger of explosion as it is not in a confined space, but keep a fire extinguisher close by. Heat flare nut, let cool, WD40 the threads while in a vertical position, allow to penetrate, flare nut wrench, open end wrench and a quick smack and you are done. When reassembled, pack the space with silicone to stop crud getting in, coat threads with NeverSeez and it will come off easy next time. Link to comment Share on other sites More sharing options...
Coremouse Posted April 21, 2017 Author Share Posted April 21, 2017 Thank you very much! As I feared, heat up is easier solution. And thanks for the reassemble suggestion! Link to comment Share on other sites More sharing options...
VocalNeal Posted April 22, 2017 Share Posted April 22, 2017 Bottle of nail polish remover from 7-Eleven. Mix 50/50 with ATF. Makes good penetration oil. Link to comment Share on other sites More sharing options...
commie Posted April 22, 2017 Share Posted April 22, 2017 Works for decades with old rusty threads: break fluid. Pour some on and let it soak for a while. Link to comment Share on other sites More sharing options...
Lickey Posted April 23, 2017 Share Posted April 23, 2017 Easy really,just use 2 light hammers and hit the opposite sides of the female nut at the same time,this mishappens the nut enough to loosen it,spraying with wd 40 will help as well.. Link to comment Share on other sites More sharing options...
Coremouse Posted April 27, 2017 Author Share Posted April 27, 2017 Fabricating new gas line Following some careful prep I'm able to double flare stainless tubing painless with cheap tools. Mesa very happi! a lot of oiling really helped the tool to hold up against stainless steel( easy to work harden, difficult to anneal ) 8mm OD x 6mm ID x 3m length tubing 1500 baht, @ klong thom ( shop name Bangkok Salamphan ), new line used 2.10m Loctite Nickel Anti-Seize 1 pound 1400 baht @ klong thom ( shop name Siam Trade Machines ) expensive Link to comment Share on other sites More sharing options...
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