Message text written by "jay snavely"
>Reading this thread prompted a question. If the anti-run on valve does
not
>reset after the car is turned off, will it also cause the car to not
>restart?
Yes. If it stays on for a prolonged period of time it will drain your
battery.
>I was under the impression that it only prevented the fumes from
>the canister from entering the carbs, now I hear that it also prevents the
>carb fuel from entering the manifold. My car has had this restart problem
,
>but I usually hear the valve close after the car shuts off.
The Anti-Ron-On valve is energized only at engine shut down. Power is feed
to it by a special terminal on the ignition switch that is hot only in the
off position. The valve is grounded through the oil pressure switch only
as long as there is oil pressure. When the key is switched on the valve is
not activated and if there is no oil pressure the valve is off since there
is no ground connection.
The function of the valve is to apply a mild vacuum to the float chambers
in the carbs to pull the fuel away from the jets and starve the engine of
fuel so it will not "run-on." It does this by applying manifold vacuum to
the charcoal canister which will direct it to the carb float chambers.
There is a valve in the carb that will swap the float chamber vent from
this special port to a port on the carb face (air filters) when the
throttle is off idle so if this valve were to hang up I think you would
find that the car will run fine underway but will not idle.
Dave
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