[KGJ]

Hi all, I'm a new owner of an old 1990 SJ70 and ever since I've been lurking around, reading up on lots of helpful insight - auszookers is such a great site!

Coming from a Defender (diesel), I've always had a fuel sedimenter. I've swapped them out for the CAV style water separator and filter combo which has worked wonders.

Being new to the world of Zook, I'm looking for anybody's advice or experience with using these secondary fuel filter / separators on their Sierra's (petrol).

My main query was if you had to modify anything? I wondered if the stock mechanical fuel pump was strong enough to keep good flow throughout...

Was also looking into what my options are if they do indeed work, as most of my searching brings up filters for diesel, not petrol. So far the only obvious option was the Ryco R2132P filters, but was unsure if it would restrict flow too much.

Any info would be greatly appreciated, as I've searched the forum for answers but couldn't find anything definitive.

Cheers.

[Gwagensteve]

The reason that you’re not finding much in the way of water separators for petrol engines is it’s nowhere near as important for a petrol and won’t cause engine damage. I believe one of the ways of clearing water from the tank (of petrol cars) is to add some methylated spirits- the ethanol is hydroscopic.

Debris from a failing fuel pump or lines clogging the carby is a far more common problem- a small motorcycle fue filter between the pump and carby is the normal way of preventing this, but it’s typically evidence of imminent pump failuer

Increasing restriction will make the fuel pump work harder but it shouldn’t be a significant issue.

[KGJ]

Thanks Steve.

Even though it's not as important, I figured that since a good filter is necessary, which these CAV's are, it's just a bonus to have a water separator as a combo.

It's good to hear that the pump may cope - but hopefully I can get a couple responses from people with first hand experience, to make sure it does and there isn't any side effects.

I have one of those small filters between the pump and carby - so will be keeping that.

What would you say the most common setup in regards to filters in Sierra's are? Just two small filters, one in the wheel arch and one between the pump and carby?

[losfer]

Steve means hygroscopic not hydroscopic. In as it absorbs moisture.
If you got water in your fuel you got a lot more problems than a carb issue it will probably be in your entire driveline.

[shep]

The stock filter has a little water trap in it.

[BlueSuzy]

G motors tend to like running on water anyway

and oil

[KGJ]

losfer wrote:

Steve means hygroscopic not hydroscopic. In as it absorbs moisture.
If you got water in your fuel you got a lot more problems than a carb issue it will probably be in your entire driveline.

Thanks losfer, i dont think i have an existing problem - my idea was more of a preventative measure.

[KGJ]

shep wrote:

The stock filter has a little water trap in it.

Thanks shep <and thanks for replying to the PM>.

Since you ran a separator, would you say it had any benefits over the little stock filter, in regards to both water and actual filtration?

[KGJ]

BlueSuzy wrote:

G motors tend to like running on water anyway

and oil

Great - sounds cheaper

[Technotron101]

BlueSuzy wrote:

I'm over the G16b's.

You love G series motors

[shep]

KGJ wrote:

shep wrote:

The stock filter has a little water trap in it.

Thanks shep <and thanks for replying to the PM>.

Since you ran a separator, would you say it had any benefits over the little stock filter, in regards to both water and actual filtration?

Pretty much the only reason I fitted one was because it was sitting in the shed doing nothing and I had a good supply of 1/2 micron cartridges.

The main thing is to put a filter between the pump and carby like Steve said earlier

[shep]

I have a bit of a habit of chucking anything that burns into my cars and the sierras were the most tolerant of different quality and types of fuel. Fyi they love avgas

[missmyljdaze]

shep wrote:

I have a bit of a habit of burning my sierra

fixed it for you........

[shep]

Haha ya mongrel

[missmyljdaze]

[KGJ]

shep wrote:

Pretty much the only reason I fitted one was because it was sitting in the shed doing nothing and I had a good supply of 1/2 micron cartridges.

The main thing is to put a filter between the pump and carby like Steve said earlier

Cheers shep.

I'm definitely getting the vibe that the water separator will work with the original fuel pump, however it's overkill and the small inline filters will be more than enough.

Thanks to everyone for being so helpful!

[barbender]

Don't know if any one else has replied for this fix", put metho in the fuel tank (Google it), metho absorbs water, hydroscopic -hygroscopic -"whatever". Has worked for me many times on 4x4's and trail bikes where fuel in the bush has been suspect for condensation etc " water ". Regards barbender

[Gwagensteve]

I mentioned it on the first reply.