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Subject: fuel line glowing cherry red

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Eric Murphy    Posted 05-28-2018 at 15:56:03 [URL] [DELETE]        [Reply] [Email]  
  • fuel line glowing cherry red
  • I have a 48-8N. I have recently replaced the carburetor, Fuel line, battery cables, ballast resistor, battery and switched to electronic ignition. Went for the first start today 5/28/2018. She started right up with no issues. I was grinning from ear to ear. I went to the house to tell the wife because she thought I was crazy for working on it in the first place. When I came back out that grin was quickly replaced with panic. I looked and could not believe what I saw. The fuel line was glowing cherry red! I went for the ignition key to shut her down and before I could she died on me. I quickly got some water and started splashing it on the fuel line to cool it down before something else went terribly wrong. Has anyone ever heard of this before? Any help would be greatly appreciated. I thought maybe something went to ground but no wires are burnt or no bare wires.

    Eric Murphy    Posted 06-02-2018 at 06:50:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: fuel line glowing cherry red
  • Ok, I ran the olí 8-N again and nothing. I kept my hand on the fuel line while checking the electrical wiring over while she was running and I could not make it duplicate the glowing fuel line issue. I have no idea what caused it. Iím glad it didnít take out the pertronix unit or worse yet burn it to the ground.

    Chuck    Posted 06-02-2018 at 18:58:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: fuel line glowing cherry red
  • If the fuel line really was glowing red, it would be wasted. Grey and flaky, and the fittings would be leaking for sure, from that much expansion and contraction. If you did nothing but start it back up, I would have to guess that you did't really see what you think you saw. Maybe some other light source cast the red light on the line?

    steveVa    Posted 05-31-2018 at 21:26:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • Did you figure out what was making your fuel line glow??

    carlintexas    Posted 05-31-2018 at 22:20:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: fuel line glowing cherry red
  • Curious how that happened my self.

    Dean    Posted 05-28-2018 at 22:02:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • I'm with Tony C.

    Check position of battery and cables.


    Joe in Texas    Posted 05-28-2018 at 17:50:48 [URL] [DELETE]        [Reply] [Email]  
  • Re: fuel line glowing cherry red
  • I think Tim touched on it briefly, but didn't elaborate. I bet the fuel line is too close to the engine and the possibility of an exhaust manifold leak is real. It wouldn't have to be a big one either, just blowing right at part of the fuel line.

    When I got my 8N the previous owner had replaced a six inch section of the steel line with rubber from the tank to where it turns and goes down to the carb. I was running it in 100 degree weather and saw the gas bubbling in the tank, not a lot but enough to make me shudder. Then I felt around under it and saw just how hot it gets between the tank and the engine, even in normal conditions.

    If you didn't to start with, get the 30 inch brake line and bend it where it is as far away from the engine as possible. I thought about designing some kind of heat shield, but haven't figured out how to make it work right.

    Tim Daley(MI)    Posted 05-28-2018 at 19:52:58 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • Good Point! Yes I did not elaborate on the other possibilities, but the fuel line is definitely a major one. This is why using anything other than the correct 1/4" steel fuel line is a no-no. Rubber, plastic, nylon, copper, or aluminum for the fuel line is an accident waiting to happen. I am certain there is more to his story...stay tuned...curios minds want to know...

    Tim Daley(MI)

    Eric Murphy    Posted 05-28-2018 at 20:12:05 [URL] [DELETE]        [Reply] [Email]  
  • Re: fuel line glowing cherry red
  • I purchased the fuel line from Just8N's. The tractor ran when I inherited it but the carb bowl had a small crack in it so I purchased a new one. I did not install the 12V system but I did install the electronic ignition just because I did not want to deal with the points system anymore. The fuel line was red hot from the carb all the way back to the fuel sediment bowl. I am not discounting the manifold leak issue just because cast iron can crack after 70 years of heat cycles.

    JMOR    Posted 05-29-2018 at 04:48:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • Well, you probably should discount a manifold leak, because if the manifold was not also "glowing cherry red", there is no reason to believe that it could be heating the line to "cherry red" temperature.

    Tim Daley(MI)    Posted 05-28-2018 at 17:17:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • I've never heard of that before. It sounds like you have something wired incorrectly. Did you follow any of the correct procedures when you did yours? I can only suspect bad wiring to ground that caused things to get hot. Unless the manifold had a big leak. here's a link to wiring to help. Good luck with the wife. Some folks should never pick up a wrench. It's like giving a hand grenade to monkey... ; > )

    Tim Daley(MI)

    JMOR    Posted 05-28-2018 at 16:37:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • "...... she thought I was crazy for working on it in the first place."

    I bet that didn't remedy her thoughts.

    Tony C    Posted 05-28-2018 at 21:57:11 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fuel line glowing cherry red
  • Once you think you have heard it all.........This.

    Likely you have a hot wire from the battery shorting against the tank, hood, hood bracket, etc. Pinched wire, un shielded hot battery terminal end shorting against the battery hold down? Terminal pushed down against the battery hold down and no insulation on the terminal beyond where the cable enters the terminal? The current is taking the line of least resistance to ground. Fuel line is a convenient route.

    Probably fried the Petronic module which caused the engine to stop.

    You got lucky. Gasoline in a closed system with no fumes close by will handle a lot of heat as you found out. It ignites only when fumes are present and there is a spark or an open flame close by.

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