[Tigers] Speaking of Vapor Lock...

[David Sosna]

Hey, Stu:
Sounds like you're halfway to a fuel injection system.
:-)

Best Regards
David Sosna
Tigerless in San Diego ('97 Miata)

On 6/2/2011 6:38 PM, Stu Brennan wrote:
> It was a hot day, no breeze, I just got home in the Tiger, and let it
> idle in the yard a couple minutes while I got something out of the
> garage.  I was also interested is seeing if my new horn block off plates
> made a difference with the temperature rise (maybe a bit).  But before
> the temp got too high, I heard the fuel pump (a Facet type) start
> clattering away, a sure sign of vapor lock.
>
> So, being an engineer, I wondered what could be done about this.
> Relocating the pump to the spare tire well (its now in the stock 1A
> location) might help.
>
> But what could I use to cool it in its stock location?  Suddenly I
> thought of an answer.  Fuel!
>
> At idle the fuel flow is extremely slow, giving it plenty of time to
> heat up in the pump and the lines.  But if it was flowing faster...  Has
> anyone ever considered putting a "T" in the fuel line up near the engine
> and adding a solenoid valve and a return line to the tanks?  Then if
> vapor lock was detected or expected, the fuel flow could be increased
> with no loss, continually cooling the pump and lines with much cooler
> fuel from the tanks.
>
> Crazy idea?  Any other thoughts?
>
> Stu
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