The V8 Owners Forum -

Can anyone suggest a low cost pre fuel pump filter? I've got a post pump filter but I would like one before the pump on my TVR RV8 with hotwire EFI using standard TVR pump.

Thanks.

richardpope50 wrote:Can anyone suggest a low cost pre fuel pump filter? I've got a post pump filter but I would like one before the pump on my TVR RV8 with hotwire EFI using standard TVR pump.

Thanks.

If the car is already an efi from the factory, it will likely have a gauze or some sort of pre-filter already. Then there is no need for anything else.

Porsche fit a large filter to some of their cars that can be used. Its a big metal bodied filter with screw threads for fittings.

Try ebay for "porsche fuel filter" and some options will appear. Obviously you'll need fittings though.

But as above, I really wouldnt bother if its an OE setup.

Thanks.

Ah. It's actually in a Dax Rush so currently I have a short pipe from tank to pump and no filter.

Most (all?) of the in-line ones do not have a big bore even if they say they have as it seems the internal bore is the same and it is the external diameter that varies.

Just really want a simple in-line cleanable type to stop anything getting to the main pump and as it's on the low pressure side, it needs to be large enough to feed the pump.

most inline filters are designed for use after the pump. Which is why they are small bore.

I think the Porsche one I mention is normally used after the pump, but given its large size, its also commonly used as a pre-filter too. You will need to source suitable fittings for it though.

Either that, or opt for a more expensive Aeromotive, SX, Fuelab, Sytec etc etc aftermarket style filter.
These will cost the guts of £100, but do have replaceable elements.

The Sytec does already come with barbs for fitting though, so that might make it a little more cost effective. The others will require threaded/AN style fittings first.

Many thanks for suggestions. I'll take a more detailed look.

What about one of these

http://cgi.ebay.co.uk/Service-Fuel-Filt ... 48395e650b

Im using the Ford Fuel Filter with the brass fitting on my RV8. It was used pre-pump on my 2.9 V6 EFi and seems to be doing the job now.

Chorlton wrote:What about one of these

http://cgi.ebay.co.uk/Service-Fuel-Filt ... 48395e650b

Im using the Ford Fuel Filter with the brass fitting on my RV8. It was used pre-pump on my 2.9 V6 EFi and seems to be doing the job now.

Unless that fitting at each end is 12mm, no way would I use it in front of an efi pump.
Or if it was a relatively low volume efi pump, perhaps 10mm.

stevieturbo wrote:

Chorlton wrote:What about one of these

http://cgi.ebay.co.uk/Service-Fuel-Filt ... 48395e650b

Im using the Ford Fuel Filter with the brass fitting on my RV8. It was used pre-pump on my 2.9 V6 EFi and seems to be doing the job now.

Unless that fitting at each end is 12mm, no way would I use it in front of an efi pump.
Or if it was a relatively low volume efi pump, perhaps 10mm.

Yup - I'd be worried about cavitation unless the filter is designed for low pressure high flow. If there's so much s**t coming out of the tank it needs a filter I'd sort that out. As it would just block the filter anyway.

The filter itself looks to have a large volume which is good. But pointless if the inlet/outlet pipe are the restriction.

Fine for high pressure use, not for low.

(Sorry, been away in sunny Portugal for a week.)

Yes, I agree that I (think I) need a low pressure filter that will feed enough to the standard TVR Bosch pump. As it's a 5.0l V8 it will use a lot of fuel and the pump does push round the petrol with some force already so a filter cannot reduce the flow.

I bought a Sytec filter some time ago but found that the internal bore was standard (and very small) and the outside dia simply changed with the model so it was not much good IMHO.

It's a new tank and so just wondering if I need a pre-pump filter for general use. Depends on forecourt petrol, I suppose.

richardpope50 wrote:(Sorry, been away in sunny Portugal for a week.)

Yes, I agree that I (think I) need a low pressure filter that will feed enough to the standard TVR Bosch pump. As it's a 5.0l V8 it will use a lot of fuel and the pump does push round the petrol with some force already so a filter cannot reduce the flow.

I bought a Sytec filter some time ago but found that the internal bore was standard (and very small) and the outside dia simply changed with the model so it was not much good IMHO.

It's a new tank and so just wondering if I need a pre-pump filter for general use. Depends on forecourt petrol, I suppose.

Engine size is irrelevant. Pump runs at the same rate regardless.

No petrol will get pushed through a filter before the pump. Gravity supplies it, with a little suction from the pump.
But there can be NO restriction in this area otherwise cavitation can occur and this will affect pump life and performance.

Thanks Steve.

stevieturbo wrote: Engine size is irrelevant. Pump runs at the same rate regardless.

Agreed but had assumed TVR installed a larger capacity pump throughput than, say, a 3.5l.

stevieturbo wrote:No petrol will get pushed through a filter before the pump. Gravity supplies it, with a little suction from the pump.
But there can be NO restriction in this area otherwise cavitation can occur and this will affect pump life and performance.

Agreed and that's my point in trying to find a pre-pump filter that will not restrict this - all seem to.

For the moment I guess I'll leave it without a filter.

Aeromotive, Earls, SX, Fuelab etc all make filters suitable for pre-pump.

Yes, they are circa £100 give or take, but they are suitable. And as the elements are stainless steel mesh for a 100 micron, they last a long time and are replaceable.
In fact....a very very long time. I cant imagine any need to replace it for at least 50k, maybe more

Plus they look nice.

Especially when you consider most OE efi setups run a mesh gauze of sorts over their intake, either in-tank or not, these are basically installed for life.

There are few efi pumps out there that wont support at least 300bhp min n/a injected form. Many will support above that