quote:Originally posted by Push1267:
I run the floats low and adjusted the idle screws lean using a vacuum gauge - they are 3/4 to 1 turn out.
I've also added a Holley heat shield with a 1/4 inch plastic spacer AND insulated the fuellines.
I also tried to run the fuel bowls almost empty before shutting the motor down (I have a switch for the Electric pump) thinking that the fuel pressure is too high leading to fuel being pressed through the needle and seats(pressure gauge reads 3-4 psi with the engine running, but maybe reading incorrect as the pump is internally regulated for 6.5 psi).
I will add a regulator.
None of these mods has solved the hotstart problem.
The carb is brand new but it's possible that the acc. pumps need to be checked? As Hustler mention, it may also be a single plane thing I have to live with.
I'm adding a pantera Electronics engine controller which run the fuel pump at 50% reduced speed which should reduce pressure as well. It also generates more spark compared to my current MSD set-up so maybe that will help.
I agree with No Quarter in that timing issues may be influencing hot starting, it's worth a look and the effects of the Pantera Electronics ignition controller when you get to fit it may also help the problem.
But at the moment i might also suggest that you drive the car, get it nice and hot, then shut it down and immediately remove the air cleaner and get into a position where you can watch (and listen) down the throats of the carb. Use a flashlight, it may be a bit dark to see small amounts of fuel otherwise.
See if you can observe fuel spilling out into the throttle bores from anywhere eg: accelerator pump discharge nozzles, idle transfer slots, idle holes if you can see them and the boosters. If there is fuel going in you should be able to observe it and then you can focus on the carb system that is causing the problem.
Remember if you move the throttle shaft the accelerator pump will spray fuel in !
Also sometimes new carbs are worse than old ones. Sometimes old carbs are good because they have proven themslves and new ones are a unknown until they are fully sorted out.
I once had a new Holley 650 that would empty it's primary float bowl into the engine every time the engine was shut down. It had a passageway that was not drilled properly allowing fuel to siphon from the fuel bowl.I don't think that is your problem because in this case the flooding was severe and your flooding sounds mild (just enough to be annoying).