Original 56 312 with vapor lock symptoms | Ford Thunderbird forum club group 1955-2005 models

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Original 56 312 with vapor lock symptoms

  • Thread starter Thread starter mc56bird
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mc56bird

mc56bird

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Thunderbird Year
1956
My original unrestored 312 has always started right up, even in this heat, whether sitting 5 minutes or two hours. Suddenly and consistently now, it just cranks with no fire. This started a few days ago, and has happened 4 times in a row. Starting symptoms when cold are uneffected. I got it to fire up each time by pulling the manual choke out full, obviously quickly pushing it back in. No fuel smoke or other flooding symptoms. Once started, it ran great as it always has, including giving it some juice to see if it was starving for fuel, which did not happen. Sort of a vapor lock issue similar to my old Ford flathead. Everything appears fine visually. Any suggestions on where to begin my diagnosis? THANKS!!!

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CSPIDY said:
Maybe your fuel pump is beginning to go bad, do you have a clear fuel filter to get a visual of the fuel?
Click to expand...
Yes, visually it all appears clear and normal. I will check my pump. Thanks!
 
mc56bird said:
My original unrestored 312 has always started right up, even in this heat, whether sitting 5 minutes or two hours. Suddenly and consistently now, it just cranks with no fire. This started a few days ago, and has happened 4 times in a row. Starting symptoms when cold are uneffected. I got it to fire up each time by pulling the manual choke out full, obviously quickly pushing it back in. No fuel smoke or other flooding symptoms. Once started, it ran great as it always has, including giving it some juice to see if it was starving for fuel, which did not happen. Sort of a vapor lock issue similar to my old Ford flathead. Everything appears fine visually. Any suggestions on where to begin my diagnosis? THANKS!!!
Click to expand...
Check your fuel lines by your exhaust if to close you will go to vapor lock had a problem with my 57 312
 
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