I tend to agree with Alan, I never had any problems with SU fuel pumps,
but then I always use a filter in the fuel line before the pump and I do
clean the points regularly using a bit of stiff and roughish paper.
Changing the points is an easy job (I carry a spare set, but I never had
to do it yet) and you can replace the points with a solid state
switching unit,. I think Burlen do them..
Kees Oudesluijs,
NL
Bob Spidell schreef:
> re:
> "I think SU pumps have a bad wrap"
>
> Not necessarily. IMO, the problem with SU pumps is they use points to
> switch the current. When the points open the induced magnetic field
> in the coil collapses producing a back current which arcs across the
> points (similar to what happens in an ignition coil). This arcing
> transfers metal with each occurrence, and also produces ozone which
> exacerbates the arcing (that's why the electronic end of the pump is
> vented). Eventually, the gap changes and/or the points stick and the
> pump becomes intermittent or fails outright. The arcing is why SU
> pumps went from nothing, to a capacitor to a diode (called a 'flywheel
> diode') across the points to reduce the arcing. The final cure is a
> fully electronic pump, with a Hall Effect and transistor-switched
> design (which solved my pump problems--I've never had a contamination
> problem).
>
> Also, the diaphragm can get stiff from age and non-use.
>
>
> Bob
>
>
> Alan Seigrist wrote:
>> Steve -
>>
>> It's hard to say without more data, but sounds like fuel starvation.
>> If cars sit for a long time, the fuel tanks rust up and the rust scale
>> clogs up the fuel pump causing it to work overtime. The fact that it
>> worked for a short while suggests this is your problem (ie it took a
>> few minutes to suck the rust into your system)
>>
>> I'd say drain and flush your tank and take out the fuel pump and
>> dissassemble and clean.
>>
>> To be honest as I get older I think SU pumps have a bad wrap. They
>> actually work fine, but they fail usually when they get clogged with
>> crap.
>>
>> All cars I buy, I ALWAYS pull the tank and fuel pump and clean them
>> out thoroughly.
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