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[GMCnet] Vapor Lock Incidents [message #98406] Fri, 03 September 2010 18:21 Go to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
G'day,

We got caught in rush hour traffic heading south on US 1 between Miami and
Homestead and suffered a number of incidents of vapor lock. It was no big
deal as I had installed Jim B's fix.

A small fuel pump (3-6 psi outlet) is installed between the Aux tank outlet
and the selector valve. When vapor lock occurs you switch from Main to Aux
and the power that actuates the selector valve powers up the pump.

I discovered that it took about 15-30 seconds for the pump to "prime" the
mechanical pump.

After vapor lock occurred the third time I "anticipated" it happening and
would watch the traffic flow and switched over to Aux before applying gas to
start moving and voila - NO vapor lock!

Jim did note that there is a downside to this fix - if there is a hole /
tear in the diaphragm of the mechanical pump the electric pump could / would
pump gas into the engine.

Regards,
Rob M.
USAussie

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
 
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