[Healeys] Fuel boiling in 100

[healey.nut at gmail.com]

Hi Peter -

On the A90 Atlantic (exact same motor) it uses a mechanical pump which has the misfortune of being located near the exhaust manifold.  Whilst this was fine for cold clammy England, in Australia where most A90s were sold, the fuel line next to the manifold caused immense vapor lock problems in any sort of warm weather.  Australian owners came up with a very novel and easy fix - they simply tied a square length of wooden dowel about a foot long onto the fuel line and the wood acted as a heat sink for the metal line, solving the vapor lock...

Congrats you figured it out!

Alan
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www.blackberry.com

-----Original Message-----
From: pvoris at q.com
Sender: healeys-bounces at autox.team.netDate: Fri, 24 Aug 2012 17:43:19 
To: <healeys at autox.team.net>
Subject: [Healeys] Fuel boiling in 100

While I haven't been keeping up with the list for a number of months, I
understand from a friend who has been a much more faithful follower that there
has been some recent discussion of the 100 and it's tendency to boil fuel when
at stop lights, etc., and die. After months of trying anything and everything
on my BN2 including the upgraded heat shield from Welch, a pusher fan added on
the front of the radiator, and Jet-Hot ceramic coating the exhaust manifold, I
finally, with the expert help of a good friend solved the problem. (By the way
it is a REAL problem here in the desert Southwest!) With the aid of a laser
thermometer we discovered that the fuel line from the pump to the carbs was
every bit as hot as the float bowls due to its having been (factory) routed
along the outside of the left-hand frame rail right beside the exhaust pipe
for much of its length. The frame rail on the right hand side, however, was
only at the ambient air temperature (a mere 98 degrees F). We re-routed the
fuel line across the back of the cockpit, forward along the outside of the
right-hand frame rail, around the front of the radiator, and back to the
carbs. We additionally re-routed the cross over feed to the rear carb to the
outboard side of the cold air box (the car has the Le Mans package) to get it
away from the rising heat from the manifold. Worked a complete charm! I can
drive the car now with absolutely no fear of its sputtering to a halt at
stops.
Hope my experience can help out a few fellow BN1-2 lovers.
Cheers!
Peter
1956 BN2
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