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Date: Sat, 05 Aug 2000 16:06:46 -0500
From: Jeff Fayne <fayne@attglobal.net>
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To: "Phillips, Frank" <fwp@ufl.edu>
Subject: Re: Flooding Float Bowls - SU
References: <F2AD0E101934D411A6A30020352AC6B25DE400@mail.admin.ufl.edu>
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Check the obvious first:
Does the needle actually close off the fuel supply: With the float bowl
cover removed from the carb, blow into the fuel inlet and swing the float
up, the needle should close off the supply and you should not be able to
blow past it (at least with moderate pressure). The front carb will have the
extra line to the rear carb, so you will have to block that with your
finger. If memory serves the standard needle valves are spring loaded,
verify you're not missing the little plunger. Verify that you don't have any
crud that worked it's way into the float bowl, preventing the needle from
closing.
Have you tried rapping the float bowl while the pump is running? If this
cures the problem you have needles that are sticking (hard to believe you'd
have two, though), also try switch back to the old needle/seat, if they are
available.
Assuming that is ok, verify the float height:
According to my manual, the float level have a gap (measured between the
float itself and the rim of the cover while the cover is inverted) between
0.126" and 0.189. You can use a twist drill of the appropriate size or a jet
adjusting nut wrench which should be 0.185" You may have to add washers to
get to this height. I found some thin brass washers at my local hardware
store that worked fine.
Can't think of anything else, keep us posted on what you find...
Jeff
'70 MGB
"Phillips, Frank" wrote:
> Nope, same fuel pump... It is a US car.
>
> -----Original Message-----
> From: Philip Schulert
> To: Phillips, Frank
> Cc: 'mgs@autox.team.net'
> Sent: 08/05/2000 17:53
> Subject: Re: Flooding Float Bowls - SU
>
> Hi Frank
> You did not happen to change your fuel pump did you . The U.S . pumps
> use 6+
> P.S.I. while U.K. pumps use 3 P.S.I. causing the float bowls to overflow
> . This
> can be fixed by replacing pump or buying fuel pressure regulator .
> Otherwise I
> am using plastic floats on my car no problem .
>
> Philip Schulert
> 71 MGB
>
> Phillips, Frank wrote:
>
> > Greetings,
> >
> > I just completed a SU HS4 rebuild and have a small problem; both float
> bowls
> > are flooding (pumping fuel out the overflow pipes). The new seats and
> > needles are of the standard type and the new floats are plastic and
> cannot
> > be adjusted. It is my understanding that to adjust the floats I need
> to
> > place shims under the needle seats, yes??? How do I know when it is
> correct?
> > Where can I get the shims? The rules in the Haynes manual do not apply
> with
> > all plastic floats so I need advice ASAP. Thanks in advance for
> helping get
> > me back on the road...
> >
> > Frank Phillips
> > fwp@ufl.edu
> > 68 MGB
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