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Re: Debugging MGB fuel system

To: Trevor Boicey <tboicey@brit.ca>
Subject: Re: Debugging MGB fuel system
From: Blake Wylie <bwylie@hiwaay.net>
Date: Sat, 24 Jan 1998 00:33:33 -0600 (CST)
At 01:12 AM 1/24/98 -0500, Trevor Boicey wrote:
>  One goes to a fuel line that goes around behind the
>carbs and feeds the back float bowl, through one of it's two
>ports, fine.
>
>  The other goes to a fuel line that goes over TOP of
>the carbs and feeds the back bowl in the other port.
>

Hmmmmmmm....one of these are wrong.

You only need one line running to the back float.  The connector looking
thing that is the lowest level should be for the overflow...it shouldn't be
connected to anything (unless you have the stock overflow pipes which run
out of the engine bay).  

So, basically you need a line running from the pump to the front bowl, then
from that same level, you have a line running to the back bowl.  Nothing
should be on the lower level connector.

You're right about not needing two lines that do the same thing.  :\


BTW...ordering new groose needles are a good idea.  What I did for mine is
just to order new needles for the float bowls, and new jets for the carbs.
I then tuned em up, and went on (you may need to get new jet needles too).
>From your problems, I would think that you have problems with your carbs,
and it's just a matter of finally getting them tuned up.

Have you actually tuned them yet?  Or at least got them to a good starting
position to tune them (since you haven't been able to get the car running to
get them tuned of course).  What you need to do first is to get the jets
level with the bridge...which means get it level with the top of that thing
it sits in.  Then, lower them four flats with the nuts that lower the jets.
This should be a good position to start.  Also, make sure that the idle
screws and the idle rod are even for both sides.  You will have to adjust
these around while trying to crank it, and once you finally crank it, you
can adjust it...if that makes any sense.  

Hopefully, after you get those carbs in decent shape (and not have lines
running everywhere), you can get the car cranked.  It may not run very well,
and don't expect it to, but after that, we can get on with tuning those
babies.  And that's not too hard once you learn how.  :)  We'll get to that
when the time comes, I guess.  :)

Hope some of this helps just a wee bit, and good luck.  :)

Blake Wylie
1970 MGB


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