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Pre-pump fuel filter
David Jenkins - 9/1/08 at 01:14 PM

I'm installing a bike pump to send petrol to my bike carbs. I've put a Filter King filter/regulator at the engine end, but I'm starting to think that a pre-pump filter would also be a good idea.

Any suggestions for an inexpensive filter? For example, would a stock Ford item like this be any good?

02GF74 - 9/1/08 at 01:31 PM

bike carbs = low pressure = less daminding criteria for fuel filter.

so I'd say that one ^^^^ would be fine - check engine size it is for so as not to restrict.

I would recommend this one, from VWP - cheap ~ £ 1.50, fits both 6 and 8 mm hose, transparent so you can see condition of filter.

britishtrident - 9/1/08 at 01:36 PM

If you have a bike pump you don't need a regulator just a cheap disposable filter.
The output pressure of the pump is limited by the spring inside the pump, if the pump is correct for the carbs it can't produce too much pressure.

If filltering on the inlet side you have to be careful as it could result in a vapour lock forming if you put too much restriction on the line. The usual way of filtering on the inlet is is a screen or sock filter inside the tank.

NS Dev - 9/1/08 at 01:36 PM

only problem is if its fitted on the inlet side it really does need a low pressure drop across it. most are designed for pressure side applications.

No idea on the ford one sorry!

David Jenkins - 9/1/08 at 01:46 PM

I fitted the filter/reg as I may upgrade to a stronger pump at a later stage - the bike pump is an unknown quantity - as I was re-running the whole fuel line then I thought that I might as well install it.

I looked at those disposable filters, but I was wondering what sort of restriction they would cause.

Maybe I'll make my own - I have the technology, plus assorted bits of brass and some very fine metal mesh. After all, the aim is to block big lumps of crud so that they don't stop the pump... the carbs are protected by the 'big' filter.

NS Dev - 9/1/08 at 01:56 PM

are you sure that the pump doesn't have an inlet mesh built in?? lots of them do.

The facet pumps all have inlet meshes, and a lot of the bosch injection ones do too.

02GF74 - 9/1/08 at 02:02 PM

quote:
Originally posted by David Jenkins

I looked at those disposable filters, but I was wondering what sort of restriction they would cause.



I reckon donut could run his cobra with one fitted no probs but that is conjecture.

I have one on my 1300 and runs fine. I have the smaller facet one, posted linky to it in some other thread today, fueling a 3.5 l v8 and that is fine ... until it clogs up ... os I remove it, tap out the crud and refit and it runs fine.

indykid - 9/1/08 at 02:56 PM

i have a disposable filter before my mitsubishi bike carb pump too but the filter's at the back, the pump's at the front.

not had any problems yet
tom

BenB - 9/1/08 at 04:13 PM

I'd leave the regulator out. It may confuse the bike pump and isn't necessary for bike carbs. Infact, it may even screw things up because bike carbs don't like car fuel pressures and vice versa...
Any cheap as chips filter will be sufficient.