Heat Soak
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Heat Soak
Now that the summer heat is upon us, I’m having carb/fuel line heat soak issues. If the truck sits for more than 15 min, and up to an hour afterward, it’s hard to start. I know re-routing the fuel line and adding a heat insulator helps, but what are some other tips or tricks? I think my issue is mostly the carb. If there were gas in the bowl, that hasn’t boiled out, it should still start right up. Right?
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Senior User
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Even if the fuel boils out of the lines and pump, there should still be enough in the bowl to get it started enough to re-prime everything, correct? I may try ethanol free just to try it as well. It’s just not readily available or cheap near me.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Gasoline itself is different than when your truck was made, once fuel injection became commonplace and carburetors a distant memory the formulation changed, called the Reid Vapor Pressure index. Some people say about a pint of Kerosene or Diesel added per fuel tank (20 gallons) helps.
Laughing Gas
Joined: Apr 2018
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https://www.pei.org/wiki/reid-vapor-pressure
My understanding is gas actually has a higher temperature needed to vaporize now by law. Except, if you have an ethanol mix in it, then you are exempt.
Winter gas also a different blend that will vaporize at lower temperatures. I wonder if some of this may be a case of winter gas blends still working their way through gas station tanks.
My understanding is gas actually has a higher temperature needed to vaporize now by law. Except, if you have an ethanol mix in it, then you are exempt.
Winter gas also a different blend that will vaporize at lower temperatures. I wonder if some of this may be a case of winter gas blends still working their way through gas station tanks.
FTE Legend
Joined: Nov 2015
Posts: 30,876
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From: Angier, NC
Ok the fuel boils / expands where do you think the fuel expands to?
It cant go back to the tank because of check valve so it is pushed out of the carb into the intake .... read floods the motor.
You can try holding the gas pedal to the floor when you try and start it and see what happens.
I also posted in the other no start hot to place ice on the carb to see if the helps and if se you know where to work on.
Dave ----
It cant go back to the tank because of check valve so it is pushed out of the carb into the intake .... read floods the motor.
You can try holding the gas pedal to the floor when you try and start it and see what happens.
I also posted in the other no start hot to place ice on the carb to see if the helps and if se you know where to work on.
Dave ----
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Not sure where you are in VA., but I'm in Lynchburg and all I did was google 'ethanol free gas' or 'non-ethanol gas' and several places came up. Two are within 4 miles of my home and now I know where they all are. That's all I run in my truck...
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Tuned
Joined: Apr 2007
Posts: 294
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From: VA
I had the same problem a few years ago. I went with the carb spacer and haven't had the problem since.
I'm here in Martinsville VA and only know of one station that sells ethanol free gas and it's high as the premium.
I'm here in Martinsville VA and only know of one station that sells ethanol free gas and it's high as the premium.
Cargo Master
Joined: Oct 2016
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From: Northern VA
What happens if you floor the pedal while cranking the engine ? My 74 would never start hot unless I did this.. winter time too. I think its because the throttle plates are 100% closed with the engine off on some of these Fords.
Cargo Master
Joined: Jun 2015
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Originally Posted by jackietreehorn
What happens if you floor the pedal while cranking the engine ? My 74 would never start hot unless I did this.. winter time too. I think its because the throttle plates are 100% closed with the engine off on some of these Fords.
Cargo Master
Joined: Oct 2016
Posts: 2,738
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From: Northern VA
You can, the solenoid plunger shaft is threaded. You can turn the turn to increase/decrease the plunger travel thus varying the throttle. You can also adjust the idle screw as well.
Choke and fast idle should also be adjusted.
For some reason I was never able to get my Ford to hot start without pedal to the metal.
Choke and fast idle should also be adjusted.
For some reason I was never able to get my Ford to hot start without pedal to the metal.
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