I agree with Paul. I resolved this same problem on my ZS equipped '77 by
re-installing the heat shield that the PO had removed.
It's very expensive for what it is, but well worth it...
Barry Waterland
Duarte, CA
1977 "B" BRG Roadster
-----Original Message-----
From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On Behalf Of
Paul Root
Sent: Saturday, April 17, 2004 11:06 AM
To: schooler@member.afa.org; MGaholics
Subject: Re: Vapor Lock?
I didn't look at the year. Yeah, I think you're right, it should be
vented. Perhaps they are blocked.
My experience was with my ZS carb before I converted. I had 'the' gas
leak between the exhaust manifold and the catalytic converter.
Paul.
Bill Schooler wrote:
> Paul,
>
> It has always been my understanding the the SU float bowls are always
> vented, either to the atmosphere (as in the older models) or to the
charcoal
> cannister if so equipped. Pressure inside the float bowl is supposed to
be
> atmospheric. Can't speak for the ZS carb but I'm assuming it to be the
> same, since it is the same basic type of carb. If the guy has a downdraft
> Weber, then all bets are off, but if it is the '68 model, they're
definitely
> vented to the atmosphere! (Yes, I've seen the SU overflow tubes cut off
and
> crimped by some DPO - which would certainly contribute to such a problem.)
>
> In any event, I've always had trouble figuring out how an MG could ever
> experience "vapor-lock", since the fuel pump is always keeping pressure on
> the liquid in the system, well before it encounter a heat source. I think
> Barney Gaylord explained once that it is possible, but the scenario he
> described sounded a little complicated.
>
> And if I'm wrong about the float bowls being vented, forget everything I
> said after "Paul,"!
>
> Regards,
>
> Bill
>
> -----Original Message-----
> From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net] On Behalf
> Of Paul Root
> Sent: Saturday, April 17, 2004 12:44 PM
> To: Daybell7@aol.com
> Cc: mgs@autox.team.net
> Subject: Re: Vapor Lock?
>
>
> If your car won't start after it has been sitting hot for a short time,
> then you probably have vapor lock. Which is when the fuel turns to vapor
> either in the fuel line or in the float bowl. In the float bowl, the
> pressure of the vapor keeps the jet closed so more fuel can't get in.
>
> To get rid of it, re-route or block the heat source.
>
> If you don't have a heat shield between the carbs and the exhaust, get
one.
>
> If you have a leak in the exhaust, fix it.
>
> If you don't have a leak and do have a heat shield, get some heat shield
> material to go on the heat shield. You can get it from Summit, or a
> number of other places.
>
> Paul.
>
>
> Daybell7@aol.com wrote:
>
>>I have been told I might have a vapor lock condition. How do I
>>confirm and
>>resolve?
>>
>>Thanks.
>>Steve Hughes
>>Gainesville, FL
>>BGT-68
>>Morris Minor-59
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