"Dave Plowman (News)" wrote in message
...
In article ,
Julian wrote:
Indeed - hence my mention of a low pressure one.

I don't think you understand the problem. The question is one of
pressure drop or delta P.

Hence the need for a low pressure one. Carb cars run at a pressure of only
a few PSI so must have a non restrictive filter - compared to injection
types.

As a rule (if fitted, and not just a gauze on the carb inlet or fuel pum)
they'll be a small paper affair and fitted after a pump. Totally unsuited
for a 'suck' through application for reasons I gave earlier on. Please try
it though - I'll be interested in your follow up report!



It has nothing to do with the mechanical
strength of the filter - ie 'a low pressure one.'

Did I say it did?

It's what you _didn't_ say. Low pressure or high pressure - neither give an
indication of pressure differential versus flow or the level of filtration.



Any filter (unless
it's the size of a dustbin for your application) will cause too much
restriction or pressure drop. You can get away with a gauze or strainer
but that's your lot.

Which is a filter.

Don't be so bloody argumentative, do drew a distinction between gauze and
filter yourself in your opening post. Do you want a constructive dialogue or
the normal ****wit style newsgroup argument that you seem to enjoy with
Doctor D?




But, many manufacturers don't even bother with even a strainer
between tank and pump, so why fit one? I suspect you suspect that
there's crap in the tank? IMHO you should remove the tank and clean
it out and forget about fitting strainers.

I think you'll find all tanks have a gauze filter internally.

No, (for instance) Audi deleted the tank strainer 1/2 way through one
model production - car equipped with K-jet and L-jet. No problems
result whatsoever.

Fine if that's your experience.

And I've read reports that most pump failures are due to dirt
entering them.

Odd reports! Most expire through normal wear and tear. They slowly
become noisy and pump current consumption increases.

And
it so happens to have coincided with the internal filter braking off.

Have you determined that this is the case? - You only seem to suspect this
in your opening comments. What are the facts?

Julian.