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Water in the carbs can cause this. A slug of water lies in the fuel
transfer passages in the carb - when it gets sucked up to the metering
needle, it blocks the jet, as water will not go through the same small
hole as gas will. When the engine stops sucking so hard, the water falls
down, letting gas through. If you get the demand high enough, the needle
is high enough that fuel flows around the water, but it still leaves the
water in the bottom. (on HS carbs with clear transfer tubes, you can
actually see this happen) Easiest thing is to dump a double dose of
DriGas or fuel system cleaner in it - the cans are usually for 20 gal,
so a whole can is about right. The cleaner may also remove varnish etc
on float and metering needles.
Your comment that the filter is of unknown age but is OK is wishful
guesswork - change it. And when you remove it, bang it on something with
the inlet end downwards - see if any water comes out. Water does not go
through good filters easily, but it can under some conditions, and it
only takes about a half cc to block the jet as described.
(banging the filter like this can get you home when water blocks the
filter too. In winter, a little water will freeze over a filter very
easily, making for a very cold walk home. This was standard procedure on
the big truck, as diesel is often contaminated; I finally started using
filters with drain plugs, which I checked regularly for water.)
FRM
On 11/13/2013 5:52 PM, John Perkins wrote:
> Arch:
> I once spent a winter evening in my MGB-GT with the battery cover
> off of the car so I could tap the fuel pump with the lug wrench every
> 10 miles for 130 miles to keep enough fuel flowing to get me home. SU
> Fuel pumps don't really die, they become zombies that need to be
> resurrected.
> I had a similar problem to yours that turned out to be worn
> needles and seats in the carbs. The seats were worn to a point that
> the needles would stick. Sometimes the rattle from the last gasp of
> the engine would shake them loose, other times a quick rap from the
> handle end of a screwdriver would shake them loose. Real Grose jets
> cured the issue.
> Perkins
>
> On 11/13/2013 4:38 PM, Arch Boston wrote:
>> Jeff, I have had fuel pumps die, but, reserection??? I always
>> thought when they died they were dead.
>>
>> Sent from my iPad
>>
>> On Nov 13, 2013, at 4:34 PM, JEFF ROMANS <jromans55@msn.com
>>
>>>
>>> /order your fuel pump now...then ready for final failure.../ on a
>>> 100 degree day mine layed down 1 mile from home in parking lot
>>> ,after a 100 mile trip. once the car cooled down, started right up
>>> and drove home. next time wouldnt start. FUEL PUMP TIME.
>>> Jeff Romans
>>> 1958 Magnette ZB
>>> > Date: Wed, 13 Nov 2013 16:20:03 -0500
>>> > Subject: [Zmagnette] What should I check first???
>>> >
>>> > My car has developed a problem..... The last few times I have
>>> driven the car it does the same thing. It will be running just fine
>>> and then it will start to act as if it is running out of gas.
>>> Stumbling and trying to die.... After I bleep the throttle a few
>>> times thinking it is truly "AAA time" the car will run just fine.
>>> There is a fuel filter between the gas tank and fuel pump. The
>>> filter doesn't look freshly installed, however, it is not needing
>>> replacement. The fuel pump is an electronic unit not SU. Should I
>>> suspect the fuel pump? In the past when I needed to replace a pump
>>> it was dead --- not working part of the time and fine later. What
>>> should I check first??? Arch
>>> >
>>> > Sent from my iPad
>>> > _______________________________________________
>>> > Zmagnette mailing list
>>> >
>>> > Donate: http://www.team.net/donate.html
>>> > Archive: http://www.team.net/archive
>>> > Forums: http://www.team.net/forums
>>> > Unsubscribe/Manage:
>>> http://autox.team.net/mailman/options/zmagnette/jromans55@msn.com
>>> >
>>> _______________________________________________
>>> Zmagnette mailing list
>>>
>>> Donate: http://www.team.net/donate.html
>>> Archive: http://www.team.net/archive
>>> Forums: http://www.team.net/forums
>>> Unsubscribe/Manage:
>>> http://autox.team.net/mailman/options/zmagnette/arch.boston@twc.com
>>>
>>
>>
>> _______________________________________________
>> Zmagnette mailing list
>>
>> Donate:http://www.team.net/donate.html
>> Archive:http://www.team.net/archive
>> Forums:http://www.team.net/forums
>> Unsubscribe/Manage:http://autox.team.net/mailman/options/zmagnette/wrench@attglobal.net
>>
>
>
>
> _______________________________________________
> Zmagnette mailing list
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/zmagnette/gofanu@cust.usachoice.net
>
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Water in the carbs can cause this. A slug of water lies in the fuel
transfer passages in the carb - when it gets sucked up to the
metering needle, it blocks the jet, as water will not go through the
same small hole as gas will. When the engine stops sucking so hard,
the water falls down, letting gas through. If you get the demand
high enough, the needle is high enough that fuel flows around the
water, but it still leaves the water in the bottom. (on HS carbs
with clear transfer tubes, you can actually see this happen) Easiest
thing is to dump a double dose of DriGas or fuel system cleaner in
it - the cans are usually for 20 gal, so a whole can is about right.
The cleaner may also remove varnish etc on float and metering
needles.<br>
Your comment that the filter is of unknown age but is OK is wishful
guesswork - change it. And when you remove it, bang it on something
with the inlet end downwards - see if any water comes out. Water
does not go through good filters easily, but it can under some
conditions, and it only takes about a half cc to block the jet as
described. <br>
(banging the filter like this can get you home when water blocks the
filter too. In winter, a little water will freeze over a filter very
easily, making for a very cold walk home. This was standard
procedure on the big truck, as diesel is often contaminated; I
finally started using filters with drain plugs, which I checked
regularly for water.)<br>
<br>
FRM<br>
<br>
<div class="moz-cite-prefix">On 11/13/2013 5:52 PM, John Perkins
wrote:<br>
</div>
<blockquote cite="mid:528402A6.6050002@attglobal.net" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<div class="moz-cite-prefix">Arch:<br>
I once spent a winter evening in my MGB-GT with the
battery
cover off of the car so I could tap the fuel pump with the lug
wrench every 10 miles for 130 miles to keep enough fuel flowing
to get me home. SU Fuel pumps don't really die, they become
zombies that need to be resurrected.<br>
I had a similar problem to yours that turned out to
be worn
needles and seats in the carbs. The seats were worn to a point
that the needles would stick. Sometimes the rattle from the
last gasp of the engine would shake them loose, other times a
quick rap from the handle end of a screwdriver would shake them
loose. Real Grose jets cured the issue.<br>
Perkins<br>
<br>
On 11/13/2013 4:38 PM, Arch Boston wrote:<br>
</div>
<blockquote
cite="mid:A34C74B4-5DBC-4531-AA54-B4318CC144A4@twc.com"
type="cite">
<div>Jeff, I have had fuel pumps die, but, reserection??? I
always thought when they died they were dead. <br>
<br>
Sent from my iPad</div>
<div><br>
On Nov 13, 2013, at 4:34 PM, JEFF ROMANS <<a
moz-do-not-send="true"
href="mailto:jromans55@msn.com">jromans55@msn.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
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<div dir="ltr"><br>
<em>order your fuel pump now...then ready for final
failure...</em> on a 100 degree day mine layed down 1
mile from home in parking lot ,after a 100 mile trip. once
the car cooled down, started right up and drove home. next
time wouldnt start. FUEL PUMP TIME.<br>
Jeff Romans<br>
1958 Magnette ZB<br>
<div>> From: <a moz-do-not-send="true"
href="mailto:arch.boston@twc.com">arch.boston@twc.com</a><br>
> Date: Wed, 13 Nov 2013 16:20:03 -0500<br>
> To: <a moz-do-not-send="true"
href="mailto:zmagnette@autox.team.net">zmagnette@autox.team.net</a><br>
> Subject: [Zmagnette] What should I check first???<br>
> <br>
> My car has developed a problem..... The last few
times I have driven the car it does the same thing. It
will be running just fine and then it will start to act
as if it is running out of gas. Stumbling and trying to
die.... After I bleep the throttle a few times thinking
it is truly "AAA time" the car will run just fine. There
is a fuel filter between the gas tank and fuel pump. The
filter doesn't look freshly installed, however, it is
not needing replacement. The fuel pump is an electronic
unit not SU. Should I suspect the fuel pump? In the past
when I needed to replace a pump it was dead --- not
working part of the time and fine later. What should I
check first??? Arch<br>
> <br>
> Sent from my iPad<br>
> _______________________________________________<br>
> Zmagnette mailing list<br>
> <br>
> Donate: <a moz-do-not-send="true"
href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>
> Archive: <a moz-do-not-send="true"
href="http://www.team.net/archive">http://www.team.net/archive</a><br>
> Forums: <a moz-do-not-send="true"
href="http://www.team.net/forums">http://www.team.net/forums</a><br>
> Unsubscribe/Manage: <a moz-do-not-send="true"
href="http://autox.team.net/mailman/options/zmagnette/jromans55@msn.com">http://autox.team.net/mailman/options/zmagnette/jromans55@msn.com</a><br>
> <br>
</div>
</div>
</div>
</blockquote>
<blockquote type="cite">
<div><span>_______________________________________________</span><br>
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href="http://www.team.net/archive">http://www.team.net/archive</a></span><br>
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<pre wrap="">_______________________________________________
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