Fuel line and fuel flooding/boil

[WileE]

That long black rubber hose is a disaster for heat retention. Use steel lines wrapped by insulation & only use rubber hose on a very short connection for flex.

 

[383man]

Hard to start after sitting about 5 minutes after a shutdown of a warmed up eng in warm weather you like are having is what I call hot soak like many have said. Its the heat getting to the fuel in the carb. When the eng is shut off after its warmed up the eng heat will rise some also and it all contributes to the fuel getting hotter in the carb and perculating out the bowl vents and flooding the eng. You know the fuel and fuel vapors has run down into the intake and flooded the eng because when this happens you normally have to hold the throttle on the floor to get the eng started since that's lets a lot more air in the eng. On my car I also ran into the fuel boiling in the carb while idling to long in real hot weather as this crap pump will boil about 190 degrees. I installed a 1" phenolic spacer and this heat shield which took care of the hot soak and took care of the fuel boiling in normal driving. The wood spacer you use should work fine as I know many who use the wood spacer and its fixed their cars. You could look into the heat shield as that will also help some. And the other option is the electric pump and a regulator with a return line which works great. If not you could also consider the vapor return factory filter. You know the 3 nipple filter/vapor return can as it may help by not letting any hot fuel push past the needle & seats while sitting as it will let the fuel vapors go back to the tank. If you do do that remember that 3 nipple filter/vapor can must be mounted correctly and facing up. Good luck with it as it does make us mad when we run into little pain in the butt problems like this. You could also lift your hood when you park to help let some of the eng heat get out while the car is parked. Ron

 

[Sonny]

I was having similar issues... Check out my thread...

https://www.forbbodiesonly.com/mopa...rock-1906-along-with-some-other-stuff.152731/

Also look into getting this and it might not be a "cure all" for you issues but I am sure would help nonetheless. I used this and you wrap it around the hose (get size larger than your hose size) with it using velcro to close.

View attachment 610120

Thanks Korican! I cheated and added a couple of spark plug wire heat “socks” to the fuel line and fuel filter where it tight to the manifold.

 

[RJRENTON]

Gentlemen,
In my opinion, all of the previous mentioned observations and "fixes" are all valid points and will help a percolation problem.
However the real problem MAY be related to the oil companies introducing RVP fuel. RVP stands for Reid Vapor Pressure which is a measure of the gasoline's volatility (vaporization index). In addition, the increase in ethanol (alcohol) being blended into the base stock....the greater the alcohol content, the easier it will volitize and csuse percolation issues. The fix...write your legislative representatives and state your displeasure. After all, we are paying more for an inferrior fuel product in the name of a "re-new able" source....the government pays the farmers (in the form of higher taxes paid by us) to grow the corn and make the ethanol and the oil companies charge us to use it....what price progress.
Just my opinion of course.
Bob Renton

 

[RJRENTON]

Another point to ponder is for those who have a fuel pressure regulator. Gasoline, like coolant, is subject to the delivery pressure, the higher the pressure raises the boiling point of the fuel. By reducing the fuel pressure b4 the carb, exacerbates the fuel boiing issue coupled with the fuel's voliitility issue. The jigher the volitility the HIgher pressure. If you feel your engine is fuel starved its not a pressure issue but a DELIVERED VOLUME issue (weak fuel pimp?).
Just talking out loud....
Bob Renton

 

[Ranger16]

For what it's worth, I had a similar problem when I bought my Roar Runner (383). I added a extra gasket under the carb, but not sure that did much. It had a factory recommended 190 thermostat in it. I swapped that for a 180 and added a fan shroud. Temps came down and I have not heard the fuel boil since. In fact I just took it for a drive today with 95° ambient temps and no boiling after shut down.

 

[Korican]

Thanks Korican! I cheated and added a couple of spark plug wire heat “socks” to the fuel line and fuel filter where it tight to the manifold.

No prob and nice! Gotta do what you can to avoid that heat lol.