>"Winnie Olmer" wrote:
>Could someone explain vapor lock in detail.>
Basically, vapor lock occurs when fuel vaporizes in the fuel line. When this
happens, the fuel pump can't pump the vapor (they only can pump liquid) and
so you get fuel starvation of the engine. The vaporization occurs because
too much heat is being tranferred into the fuel (usually via a fuel line,
but can be within the carb or elsewhere) from the ambient temperature that
has been elevated by heat coming from the engine (and the outside air temp).
To cure it, you need to insulate the fuel line(s), or move lines farther
from the heat source, or insulate the carb from the engine (that's what
those plastic spacers are for between the carb and manifold).
I had this problem bad in a '73 Datsun 240Z that hada dual SU carbs. When
the engine got up to temp, and on a hot day, under stress (like jamming on
the accelerator), the engine response was to buck like a bronco.
Roy Malac
'60 TR3a TS63103LO (under restoration)
techman@metrolink.net
|