Outer Limits 4x4 Board

Recently i fittied a CAV filter system to my lux to see if it would help with its problems

After fitting the filter i could see air bubbling out of the center stem while the truck is running.

My question is there was a medium sized rubber O ring in the packaging with the filter but no explanation as to where it is to be fitted...
is this a spare or does somone know wher it goes?
btw if ppl dont know its for a 3l diesel hilux

I also have a cav filter which came with the flat ring and
the o ring

The only ring which fitted was the o ring so I through it out


As for the air bubbles in the fuel I gues you primed it so i dont know.
Mabe the fuel hose clamp or a loose return line clamp

There 'should' be three or four O rings with a new filter element.
A little one (approx 6mm o/d) to replace the one on the centre bolt that holds the whole thing together.
One about 15 mm dia which fits on the centre stem at the bottom of the centre casting.
Two large flat ones which are slightly different in size. The smaller one goes below the filter element between it and the bottom or glass bowl whichever is fitted and the larger one goes on top of the element.
Quite often the smallest one is missing, probably fallen out of the corners of the box and sometimes the smaller of the big flat ones isn't provided either.
Genuine CAV elements come in at least two grades, blue filter down to 5 microns and green to smaller still.
I've used CAV's on cruisers for over twenty years, steer clear of Ryco elements as they don't seal on the centre stem, try and stick to genuine.
Cruisers don't have any problems with fitting additional filters like the CAV but have heard that hilux's will feel the extra restriction with lower performance. You can get an adapter to allow replacement of original filter with CAV element.

bling .. this would be the filter ur talking about im assuming ...
its on my nissan ... one thing i found with mine is its an ass to get it to line up properly and get it all sealed when changing filters

also .. if u have modified and tweaked ur injector pump ... it'll starve ur engine ... well mine did ... installed an electric fuel pump to compensate
for the filter and works sweet as now

Hoonz, I have one of those on my turboed lux. Do you mean with the electric pump it helps to keep pressure/supply up to the injector pump cause the cav filter is more restictive to the flow than standard??

yeh spot on dood ...

Wouldn't the electric pump flood the injector pump or just keep the fuel up to it. Is there a good one to get as I may look into it now...

Hoonz wrote:yeh spot on dood ...

They shouldnt be any more restrictive than the normal pump, the hoses are all same diameter in and out. and the bowl shouldnt MT out.. ?

its restrictive cause its a 5 micron filter
when we first started my rebuilt engine it was ok till it started revving
3800-5200rpm spluttered and carried on like the injectors were fukked
but smart people know things and a electric fuel pump was put on and it worked fine after that ... havn't touched it since

bogged wrote:They shouldnt be any more restrictive than the normal pump, the hoses are all same diameter in and out. and the bowl shouldnt MT out.. ?

The pressure drop across a filter is largely a function of the filter efficiency. A more efficient filter will have a higher pressure drop. Nothing to do with the hose diameter.