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.

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

Did I say it did?

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.


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.

On mine the one way valve has failed. Likely caused by dirt, I'm told. And
it so happens to have coincided with the internal filter braking off. So
I'm not keen on the same happening to the expensive replacement I have
waiting to fit.


My tank did have a gauze filter but it's broken off - hence the desire
to replace it with something similar externally. Specialist ones
specifically for this are available but expensive.

Do as you wish, but you're barking up the wrong tree.

I don't think I am.

--
*Caution: I drive like you do.

Dave Plowman London SW
To e-mail, change noise into sound.