Carb float bowls run at atmospheric pressure, that's why they are vented. The
negative pressure (ie, below atmospheric) at the venturi is what allows the
atmospheric pressure on top of the fuel in the bowl to PUSH the fuel into the
venturi.
I think JB Weld would would just ducky for a pinhole leak.
Geoff Branch
'74 Meejit "Yellow Peril"
'72 Innocenti 1300 Mini
----- Original Message -----
From "Michel R. Gagne" <mgagne at unc.edu>
To: "spridget list" <spridgets@autox.team.net>
Sent: Sunday, January 18, 2004 8:41 PM
Subject: Pinhole in float bowl lid
> Hi Everybody,
>
> Just making one last attempt at getting my carbs settled. I installed a
> pressure regulator and new needle valves in the float bowls as I was getting
> fuel seeping around the rear jet. I put the old jets back in to test
> everything. Well after turning the fuel pump on and letting it sit for a
> couple of minutes I see fuel seeping into the body of the rear carb again,
> damn.
>
> I also just found a pinhole in the lid of the rear float bowl so my question
> is does the headspace of the float bowls normally run at a positive or
> negative pressure. If the answer is slight negative pressure then I9m
> thinking that the pin hole would increase the pressure relative to the carb
> body and increase the fuel level in the jet and lead to the fuel seepage.
> What do you all think?
>
> Regardless I9ve got to fix this pinhole. Does JB Weld hold up to gasoline?
|