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vapor lock solution?
  • Spencedaddy
    Posts: 3Hitchhiker
    i have a 1979 Lincoln Mark V continental, and i have been having some serious issues

    i have already replaced the mechanical fuel pump with an electric one

    the first time i broke down it was traced to the ignition control module

    which i replaced with a new one



    then the second and third time, it did a thing where i ran for about 30 minutes, and then shut down, in extreme heat, which i have narrowed down to vapor lock



    i have talked to a few people, and they have said that this was a common problem for Fords Lincolns, and Mercury's as the fuel line ran to the front of the engine, giving it more time to become heated by the engine's radiant temperature



    so i have wrapped the fuel line in automotive heater tubing, and that has seemed to have helped





    but i want a permanent solution so i came up with the idea of actually cooling the fuel lines, either in the engine bay, or as the line runs from the tank i searched this on google, and the thing i heard of was running the fuel lines through a can filled with dry ice, but since dry ice would melt extremely quickly i am forced to come up with a completely new idea, the things i have thought of are;



    1.using a vessel filled with mineral oil, which dissipates heat quickly, as seen in some computer cooling projects

    2.some sort of cooling fins on the line, besides clothespins



    so thats where i am now, any help is greatly appreciated



    forgot to mention that somehow when i was insulating the lines last night, i discovered that there is some kind of break in the fuel line that has been patched by putting on some rubber tubing, most likely rubber fuel line, and clamped on, could this be affecting the vacuum at high temperatures
  • Ted W
    Posts: 267Gold Member
    I have had several Mark V's and I have not seen this problem. However, I have had several Mustangs and I have used a BG inline heat sink to solve vapor lock problems. First, you must make sure the fuel line is not "hose", it needs to be metal. Then install the BG sink. BG FUEL COOLER
  • Spencedaddy
    Posts: 3Hitchhiker
    i just found a potential problem





    there is a break in the fuel line, and someone patched it up with some rubber hose and clamps...could that be contributing?
  • rich cummings
    Posts: 80Expert Adviser
    no-- the repair will not cause vapor lock-- --vapor lock is when the gas boils in the line and turns to a vapor-- its only caused by heat-- -

    choices-- rerout gasline --

    are you sure its vapor lock-- ??-
  • Spencedaddy
    Posts: 3Hitchhiker
    i talked to my mechanic, and he said that there could be a potential rust problem that is, when added with the heat issue, what is causing it to not run, i changed out the fuel filter, and it was FULL of rust, so the mechanic said that we may have to drop the tank, replace it, and the fuel lines, also, i will be changing back to the mechanical fuel pump



    could rust really be causing it to lock up with the heat?
  • bob1951
    Posts: 2Hitchhiker
    My Mom always put wooden clothes pins on the fuel line. That always worked for us. Did it myself on a 1953 Cad that would always vapor lock at about 3500 foot elevation. Don't laugh, Try it.