Fuel leak question

[OCCOBRA]

I also have a BBFE and IDA's and had heat also percolating the sh$t out of them. problem... too much heat under the hood flowing through hood opening heating the bodies of the carbs. The heat is not coming up through intake its the air passing by the carb bodies. Carbs were so hot I could not hold my hand on them. I wrapped my headers, and added angled shroud to back side of rad to through heat down. Really helped out . I have a straight up (not canted) intake with a large opening in the hood, no scoope. So I really had air flow up and alongside carbs. I also plan on shrouding the top of the Rad because alot of air is still flowing up past carbs but fan angled down and wrapping headers really helped

[Eljaro]

Zimmy,

I have been fighting a problem for a while and need someone's help. I have 48 IDAs on a big block with the 10 deg canted intake. Whenever I stop the car after a drive, the heat seems to percolate the fuel and I get dripping out of the accelerator pump jet. It collects in the throat and eventually leaks out of the throttle shaft onto the manifold.

I have a return line on the fuel so it should be immediately dropping pressure when the car is turned off and I have the phenolic gaskets under the carbs.

I have exactly the same problem. The biggest problem is that the fuel also drips into the engine and will end up wearing your rings prematurely.
The fact is that the carbs are absolutely cool when I arrive at my garage, even after hard driving, but after about 10 minutes they are hot as hell and and I can hear a boiling noise and gasoline dripping out of the pump jets.
The phenolic spacers help, the return line also, the smallest pump bypass did not, but the problem seems to be the heat emanating from the engine after shutdown and rising around the carbs which heats them up. Also keeping the hood open does not help.
I did build myself a heatshield for one carb in order to see if it would help, but it did not. I am seriously thinking of installing a fan to get the heat out of the engine with a timing device so it will come on when I shut of the engine off and stay on for about 15 minutes. Where to install the fan is what I am thinking about now.
I read somewhere Rick Lake suggesting to install two fans, one behind each side vent. That could be an elegant solution and would also help during hot days and slow trafic to keep things cool.
I am thinking of some type of 5 inch computer fan with low consumption, because if necessary it could stay on longer without draining the battery.

This is right now my only problem with the webers.

[zimmy]

Eljaro:

I am at least glad to know that I am not alone. I know it isn't heat from running. When I saw this problem again this week after the engine was back in the car (long story) and I went for the first drive. It was 45 deg F outside and the trip was fairly short. I also think that it is heat sink after it is parked a few minutes. I'll keep looking for a solution and will let you know if I find anything.

Happy Holidays.

[cobrakiwi]

if you run an electric fuel pump only turn pump off before you turn your car off, hit the gas pedal a few times to empty some of the fuel out of the webbers.
This used to work for me on a 289 with IDA's I had a few years back.

[Eljaro]

The problem is the fuel trapped inside the pump conducts in the carb body. The carb heats up and the fuel inside the pump conduct has probably some air trapped along the way, which expands with the heat and pushes the gasoline out the pump jet. The pump draws the gasoline from the bottom of the bowl, so a lower bowl level should not be of much help.
I think only shielding or some type of evacuation of the hot air should help.
I am going to try a pair of Muffin type fans mounted behind each side vent and improve the heat-shields I have already made.

[carmine]

Starting instructions after hot shutdown of webers. Push gas pedal half way to the floor and hold that position , then turn the ignition key and she will start right up.

May sound to easy a fix but works every time.

The extra fuel that has dribbled and perculated out of your carbs and down the manifold is not enough to hurt your engine or rings if you give the engine more air during these start up conditions.

Buy holding the pedal half way to the floor the throttle plate is half way open allowing the engine to suck in the nesessary amount of air to lean out the hot, rich and vapourised condition found in intake manifold, carbs and heads.

These conditions mainly found after first hour of engine shut-down.

Getting into this habit of start up can be used in all conditions.