I found this article regarding people running the Autolite carb in off road
situations
http://www.pirate4x4.com/forum/general-4x4-discussion/1697898-wheeling-carb.html
. Thought it might be helpful. At least the modifications are all
reversible. I'd also think that one could run hoses off the vents and just
exit them to a catch can. Not ideal for a stock air cleaner, but a small
hole in aftermarket item would seem doable. For what it is worth the SU's on
my Datsun 510 have banjo type fittings on the top of the float bowl, that
attach to metal tubes about 18" long, and these exit near the oil pan.
My guess is that the fuel is boiling and the float is bouncing off bubbles
rather than supported by a (for lack of a better term) "solid" fuel.
-----Original Message-----
From: Gary Winblad via Tigers
Sent: Monday, August 31, 2015 2:37 PM
To: Stu
Cc: Tiger Net
Subject: Re: [Tigers] Carb Fire Continued
Well...
I am definitely in the "has a history" camp.
When I bought my Tiger in 1971 I definitely had the problem.
In my case it was cold starts. Every once in a while (well frequently)
but intermittently I would turn on the pump in the morning and hear
the familiar plink-plink sound... and hear the plink-plink sound...
and hear the... well you get the idea. Open hood and see the intake
manifold all wet and puddled. It got so bad I just drove it that way,
fortunately it never caught fire.. surprisingly.. dumb kid!
I tried checking everything and several new inlet valves but it still
did it occasionally. I didn't get it finally fixed until 1973 when I
bought a Holley that is still on the car. Now of course Holley's have
their own fuel leak problems but never a stuck inlet valve...
Gary
----- Original Message -----
From: Stu via Tigers <tigers@autox.team.net>
To: Tiger Net <Tigers@autox.team.net>
Sent: Mon, 31 Aug 2015 16:44:22 -0000 (UTC)
Subject: [Tigers] Carb Fire Continued
Michael King thinks there's a history of the stock carbs lighting things up
on hot restarts. Does anyone else have any history?
Does anyone know what the mechanism might be? I know the accelerator pump
is OK, nothing dripping there. The only other logical explanation is fuel
being forced out the bowl vent. I'll look for traces when I take the
photos tonight. Could the float valve works have occasional issues? A
sinking float? Could fuel be boiling from the heat soak when its shut
off? Or when fuel hits the hot bowl when the pump starts? Any other
theories?
Stu
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