I solved my vapor lock problems on my 4A by rotating
the top of the fuel pump 90 degrees. On the 4A the
fuel line normally comes out directory toward the
engine, by rotating the fuel pump top I go at least a
5" seperation as opposaded to 1-2".
David G. Whitelaw (slasher_dw@yahoo.com)
66TR4A IRS
--- Roy <techman@metrolink.net> wrote:
>
> >"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
>
>
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