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Re: Fuel pump problems?

Subject: Re: Fuel pump problems?
From: Bob Howard <>
Date: Thu, 21 Nov 2002 08:55:22 -0500
  You can test the delivery at the carbs by disconnecting fuel line there
and turning on ignition. In the worshop manual is a specification for
delivery rate, but if the thing pumps regularly and quickly into the can
you are holding, you can assume that it is doing its job.  Be careful not
to spark the gas, etc, etc  (CYA wording) 
   How old is this pump?  You can count on 70,000 trouble-free miles,
after which the pump may reveal its age.    How old is the filter? Might
it be plugged?
   In the neg earth MGB you could most easily use a neg-earth pump. 
Check the book, though, since the earlier (that's non-specific but true)
pumps are not polarity sensitive.  The electronic ones are sensitive,
however, and those with transistors/diodes are sensitive also.   Did you
rig an alternative wiring setup to the existing pump when you changed the
car to neg earth?  

On Wed, 20 Nov 2002 17:54:01 -0500 joseph cianciotti
<> writes:
> When I started the B this morning there was no familiar "click-click" 
> from
> the fuel pump. But the car started well and off I went. However on 
> my way
> home, the car started hesitating like it was running out of gas and, 
> in
> fact, died. After cranking, though, it started right up. It 
> hesitated a
> couple of other times and even died again. But after a bit of 
> cranking, it
> restarted and I was able to get home.
> When I got home I checked to make sure the pump was getting 
> electricity and
> yes it was. I even turned the fuel pump off so the carbs would run 
> dry. When
> I turned the pump on, my clear fuel filter filled with gas. But the 
> pump
> only clicked on one occasion. But the engine never died on its own.
> It's not freezing here (yet). And I add gas treatment to every other 
> tank,
> so I doubt there's water in the gas. But I'd hate to replace the 
> pump and
> later find that all I needed was a bottle of dry gas.
> Is the pump on its way out? Is there another way I should check it? 
> Could
> there be another cause?
> And if I do need to replace the filter. I notice that Moss has 
> positive and
> negative ground pumps. I converted my B to negative ground. Which 
> one should
> I get? (Right now, I've got a positive ground pump it there.)
> Thanks in advance,
> Joseph
> 67B Roadster

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