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RE: Fuel pump

To: "'Telewest \(PH\)'" <>,
Subject: RE: Fuel pump
From: "Lew Palmer" <>
Date: Thu, 22 Aug 2002 09:26:49 -0500
Sorry, but if the pump is clicking and not delivering fuel, the problem
is most definitely NOT electrical.

If it fails to shut off, is not leaking fuel, and continues to click it
indicates an air leak somewhere on the suction side of the pump. It
could be a split diaphragm or a stuck inlet valve. The biggest enemy of
this pump is non-use. The diaphragm gets hard and refuses to pump. 

First check the lines to and from the pump. If they are not leaking then
your best bet is to remove the pump and rebuild it.

Lew Palmer

> -----Original Message-----
> From: [] On
> Of Telewest (PH)
> Sent: Thursday, August 22, 2002 3:44 AM
> To: Nory;
> Subject: Re: Fuel pump
> If your Midget has the same type of pump as the MGB i.e. the SU
> reciprocating type that stops when the system is up to pressure the
> problem
> will almost certainly be electrical and not the diaphragm.  A sharp
> may get it working for a while, but you need to get at the pump and
> up
> the contacts that are in the electrical end of the pump.
Alternatively it
> could simply be that there is a break in the 12v or ground feed to the
> pump.
> If you listen carefully by the pump while you turn the ignition on and
> makes a single click you can be sure it is the points stuck together.
> However if they are burnt and not making contact you won't hear the
> but the fix is to clean and check the points in both cases.  This used
> be
> a routine maintenance item on the square-riggers and the pump was
> very accessible.  But in MGBs a capacitor was fitted in the pump to
> the
> points burning, which it does - for the first 100,000 miles or so!  On
> MGBs
> at least this capacitor probably led to the factory putting the pump
in a
> position that renders getting at the points in-situ almost impossible.
> Later pumps have diode protection which is even better than the
> -
> but the factory also moved the pump so that its electrical end stuck
> the boot/trunk making the electrical end accessible again.  The higher
> position of the RB pumps also means that it can be changed without
> to
> drain the tank and without fuel running out all the time.  And yes,
> of
> use may have contributed, new pumps come with a leaflet advising to
> the contacts if the pump doesn't work initially before returning the
> as
> faulty.
> ----- Original Message -----
> From: "Nory" <>
> To: <>
> Sent: Thursday, August 22, 2002 3:00 AM
> Subject: Fuel pump
> > This should be an easy one for all you experts-  I think I know the
> > answer, but I'd like confirmation before I start throwing money
> > around.....
> >
> > The fuel pump on the Midget isn't pumping any fuel, and it's
> > away as if it were out of gas, but the gas tank is full of fresh
> > Is the diaphragm on this pump shot?  Or might there be a different
> > problem causing this behavior?  The car has been in storage for a
> > if that has any relevance.....

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