Subject: [TR] Which threadlocker color for wet-liner four AC fuel pump diaphragm cover screws?

From: Don Hiscock <[email-masked]>
Date: Mon, 6 Oct 2025 11:19:51 -0600

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For some unknown reason, after ten years or more in the TR3B the machine
screws that hold down the top of the diaphragm cover on the original AC
fuel pump have started working loose as the car is driven.  Gasoline then
seeps slowly from the edge of the diaphragm due to the pressure head in the
tank.  Very odd.  The first time I was willing to chalk up to a one-off.
But now it's a trend.

There's only so tight one wants go go on those screws without distorting
the diecasting, and I'm probably a little past where I feel comfortable now.

Seems like a case for a threadlocking compound.  I'm guessing purple
Locktite might do the trick -- it shouldn't take much.  Has anyone been
down this road ahead of me?

https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">For=
 some unknown reason, after ten years or more in the TR3B the machine screw=
s that hold down the top of the diaphragm cover on the original AC fuel pum=
p have started working loose as the car is driven.=C2=A0 Gasoline then seep=
s slowly from the edge of the diaphragm due to the pressure head in the tan=
k.=C2=A0 Very odd.=C2=A0 The first time I was willing to chalk up to a one-=
off.=C2=A0 But now it&#39;s a trend.=C2=A0</div><div class=3D"gmail_default=
" style=3D"font-size:small"><br></div><div class=3D"gmail_default" style=3D=
"font-size:small">There&#39;s only so tight one wants go go on those screws=
 without distorting the diecasting, and I&#39;m probably a little past wher=
e I feel comfortable now.<br><br>Seems like a case for a threadlocking comp=
ound.=C2=A0 I&#39;m guessing purple Locktite might do the trick -- it shoul=
dn&#39;t take much.=C2=A0 Has anyone been down this road ahead of me?</div>=
<div class=3D"gmail_default" style=3D"font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-size:small"><a href=3D"https://photos.smug=
mug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-Q=
WD7M6q-X5.jpg">https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6V=
HFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg</a></div></div>

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