Floods when hot starting
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Trailering
Joined: Nov 2012
Posts: 17
Likes: 9
Floods when hot starting
1966 F100 240 six cylinder 4 speed
The truck starts great from cold but after it is warmed up and then sits a little while it floods when trying to start again. Not sure about the float level but I assume it is fine because I never have any issue while driving. Anyone one have any ideas why it does this?
Thanks for viewing
Jeff
The truck starts great from cold but after it is warmed up and then sits a little while it floods when trying to start again. Not sure about the float level but I assume it is fine because I never have any issue while driving. Anyone one have any ideas why it does this?
Thanks for viewing
Jeff
Fleet Mechanic
Joined: Dec 2016
Posts: 1,257
Likes: 699
Sounds like boil over. Modern fuel boils at a lower temp than those of yesteryear so after sitting a bit, heat soak causes fuel to expand and flood the engine. Sometimes a carb spacer can help to insulate from the heat that causes it. Holding gas pedal to the floor while cranking can help as it lets maximum air into engine balancing out the excessive fuel.
FTE Legend
Joined: Nov 2015
Posts: 30,895
Likes: 4,119
From: Angier, NC
Sounds like boil over. Modern fuel boils at a lower temp than those of yesteryear so after sitting a bit, heat soak causes fuel to expand and flood the engine. Sometimes a carb spacer can help to insulate from the heat that causes it. Holding gas pedal to the floor while cranking can help as it lets maximum air into engine balancing out the excessive fuel.
Someone said a gallon of diesel to a tank of fuel may help but I have not tried that.
Now the exh manifold is bolted to the intake manifold and there is a flapper valve that when cold directs hot exh gas to the floor of the intake manifold to help keep the air / fuel in a vapor state. If the intake is cold the fuel will drop out of the air and pool on the intake floor and dribble into the cly.
Make sure this valve moves freely or better yet wire it so no hot exh gases blow on the intake.
I run EFI exh manifolds so I dont have the intake & exh manifolds bolted together but I do run hot water to the intake floor to heat it as I drive my truck year round, coldest so far 20*f with out issues.
I just live with the hot start problem as it really is not that bad for me.
Dave ----
Laughing Gas
Joined: Mar 2013
Posts: 770
Likes: 309
The hot start procedure in my carb cars/truck's owners manual state to hold the throttle open and do not pump the pedal when hot restarting, even the 80's carb cars with idle circuit cut-off solenoids that prevent fuel from dripping from the idle circuit after its cut off.
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