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Re: Engine dying...update 2

To: MG List <>
Subject: Re: Engine dying...update 2
From: Max Heim <>
Date: Mon, 26 May 2003 18:50:33 -0700
1. who is Dave?

2. the needle valve controls the influx of fuel to the float chamber. It is
located above the float arm, and is operated by same. As the fuel level
rises, the float floats, and rises up, pressing the needle valve closed,
thus shutting off the flow of fuel.

You can see that anything which prevented the needle valve from closing
would allow an unmitigated flow of fuel, resulting in flooding.

One way to check it is to remove the float chamber lid entirely, and blow
through the fuel inlet nipple, while slowly raising the float with a finger.
At some point the airflow should cut off.

You also might want to make sure the float is floating and isn't full of

on 5/26/03 1:01 PM, Phillip Erikson at wrote:

> Don't mean to sound stupid, Dave,but what's a needle valve and how do I
> check it to see it isn't stuck open?
> Thanks,
> Phil
> ----- Original Message -----
> From: "Max Heim" <>
> To: "MG List" <>
> Sent: Monday, May 26, 2003 1:10 PM
> Subject: Re: Engine dying...update 2
>> 1. you have HS6s on an MGB?
>> 2. you didn't mention checking the needle valve to see if it was stuck
> open.
>> That would be the most obvious cause of the gas overflow problem.
>> on 5/26/03 11:37 AM, Phillip Erikson at wrote:
>>> The problem seems to come from the rear HS6 carb as I  saw gas coming
> out of
>>> the overflow tube (from the float chamber) as the car sputtered and
> started to
>>> die. So I plugged up the gas line and let the gas in the float chambers
> run
>>> out. I then removed the float chamber lid of the rearmost carb along
> with the
>>> float assembly. I cleaned out the bowl and checked for proper gap
> between
>>> float lever and the rim of the float-chamber lid. Everything looked OK.
> I then
>>> reassembled the carb and tested it around the block. Everything was fine
> for
>>> about a mile and then it died. When I restarted the engine it ran rough
> and I
>>> could smell gas. I hi-tailed it home and shut it off. This time there
> was a
>>> lot of raw gas sprayed all over the inner fender well, in addition to
> that out
>>> of the overflow tube. Any ideas what it could be?? I certainly can't
> drive it
>>> any distance like this -- too dangerous!
>>> TIAQ.
>>> Phil Erikson
>>> 1966 MGB


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires

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