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Fuel tank float/brake clunk

To: "spitfire maillist" <spitfires@autox.team.net>
Subject: Fuel tank float/brake clunk
From: "Jack" <jkagy@bpsom.com>
Date: Mon, 1 Jul 2002 22:32:53 -0400
I finally got around to pulling the sending unit from the fuel tank of my '78
spitfire today.
I had rebuilt the clutch slave and put in a new speedometer cable.  They work
OK now, so the mileage will rise above the 26K+ I've had for the past few
years.
The fuel gauge hasn't worked since I got it.  I suspected maybe the sending
unit was "frozen" since fiddling w/ the wiring didn't seem to make any
difference.
I found the unit wasn't frozen but the plastic thing that's supposed to float
was full of fuel.  I manage to shake it to get the fuel out and put it back in
to see what would happen. Actually, nothing happened, but that is
inconclusive, since the tank was about empty of fuel anyway in preparation for
this very operation.
I plan to swing around to fill it up and see whether the float will float, at
least a little while, before it fills up and sinks again.
My question is, does anybody know where/if I can get just the float?
I didn't operate the sending unit while I had it out.  The book had advised to
"isolate the battery' during this operation and it seemed like a good idea,
therefore there was no electric to operate the gauge.
I have also detected a "clunking" noise when I brake from street speeds.  It
seems to be coming from the right rear and only under braking.  I had looked
at the brake and checked for U-joint play before and couldn't find the
problem, but I'm still not ruling out either one. Anyone have any ideas?
JAK

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