Based upon what you say below here is my theory.
I am pretty sure that the float chambers are boiling dry during the
first 5 minutes after you shut the engine off. After this happens
turning the key on starts the fuel pump BUT as the bottom of the float
chamber is still very hot, because of the reflected heat from the
exhaust manifold, the fuel delivered to the float chamber "flashes off"
or evaporates immediately. After sufficient time for the float chambers
to cool down (15 minutes) liquid fuel will accumulate in the float
chambers and the engine will start.
I would recommend you can test this by getting to the 5-15 minute won't
start situation then pouring a little cold water over each float chamber
before trying to start the engine.
If after the fuel pump is allowed sufficient time to fill the float
chambers (10 seconds) the engine starts OK with the cooled float
chambers then you can be pretty sure that you will need to devise a
method or methods to keep the float chambers cooler.
From: email@example.com [mailto:firstname.lastname@example.org]
On Behalf Of James Shope
Sent: Wednesday, April 28, 2004 11:14 AM
Subject: 100 car problem
thanks for all the help. checked out the vent system yesterday.
the nut which had corrosion and made sure system was venting. it started
perfectly and i drove it around until heated up to about 170-180 on
once shut off it will start smoothly if it sits for just a minute or
problem comes in when let to sit for 5-15 minutes in direct sun. if
to sit longer, it starts smoothly, which tells me the heat has
excess fuel. i have not noticed any fuel streaming out of manifolds,
neither my moss catalog or manual show any kind of drains like on my
do not understand how the fuel is getting into the engine if it has
venting to allow for expansion of the fuel. maybe a louvered hood is
answer but she says she did not have this problem in the past so i am at
loss to decipher the problem. oh well, back to the drawing board.