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Thread: CAV's what brand of filter is the best ?

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    CAV's what brand of filter is the best ?

    I am looking for a quality filter,it has been suggested a Delphi what else is out there ?,And is a CAV with a glass bowl good enough on it's own or do I need a secondary filter with todays fuel I just installed my high $$$$ injector pump and I want to protect it, I have a 92 Gq Td42

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    Quote Originally Posted by First Pooy View Post
    I am looking for a quality filter,it has been suggested a Delphi what else is out there ?,And is a CAV with a glass bowl good enough on it's own or do I need a secondary filter with todays fuel I just installed my high $$$$ injector pump and I want to protect it, I have a 92 Gq Td42
    My input.
    I sell engine filtration for a living. I am a Fleetguard and Donaldson wholesaler. I have sold gazzilions of the CAV setups, also the Fuel manager setups etc. Unless you live in remote areas where your fuel supply is less than desired, the stock filter will be more than perfect. Eevn if you were to do a remote trip, I would just take a few spare OEM or equivalent filters on the trip as spares.
    Whilst engine fuel filtration is important, on a TD42 its not as important as a newer common rail motor as they require much higher fuel pressures and tolerances are far less.
    The other issue that has risen its head is some people have added an extra filter setup and then they have experienced some performance issues. This is due to the extra fuel flow restriction from adding a secondary filter. This is moreso for th CRD motors though. Not so common though but it can happen.

    All in all. In my opinion. If you want to protect your IP. Change the stock filter more often. And use a quality filter. I change mine every 15 though regardless. And my Patrol wouldn't even see 15k in a year.

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    Travelling Podologist Cuppa's Avatar
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    I use a CAV filter as a 'pre-filter' before the stock factory filter. It works (& no fuel restriction issues).I respect Mudski's knowledge but neverthless own a car I purchased to both travel in remote desert areas where fuel is not always as clean as in the city, & to last me for many years. Fuel pumps are expensive things to fix so I feel it not unreasonable to protect the pump from potential premature wear..... so I consider the extra filter to be cheap insurance.

    The pic below shows both filters which were fitted at the same time after a trip of several months up to Queensland via dirt roads, around the outback channel country & back to Victoria. I decided after that to double the change period for standard filter.
    I chose the CAV type filter because replacement filters will be available in just about any country town which supports agriculture of some sort. (Anywhere there are tractors). The downside is that changing filters is a bit more fiddly than a simple screw on type, but considering the effectiveness & the low filter cost I'm happy.

    A few years ago a friend picked up some dirty fuel well in the middle of woop woop, & travelled some distance before his filter clogged up. He was able to get to where he was going, a couple of hundred remote kilometres by changing CAV filters & running until they clogged. He got through 6 or 7 filters on that leg of his journey. The point is that with the low cost he could afford to carry a few spares, & being quite small could fit them into his available space. I also fitted a diesel resistant one way bulb primer in line at the same time which makes priming an absolute breeze compared to the silly little pump on top of the standard filter.

    A8C76071-7146-4B4A-925B-C61D70E8BC0A.jpeg
    Last edited by Cuppa; 8th April 2019 at 10:00 PM.

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    In your case Cuppa, or any case that see's someone being off road a lot and buying fuel from god knows where, a pre filter would certainly help. No doubt. But, for the majority of shopping trolleys, its not really a necessity, in my opinion.

    If you are going to put a secondary filter on though. The CAV's are good. They are 12 micron at 99% efficiency, so it filters fairly fine particles but may not be enough for the CRD motors. The filters are dirt cheap too, about $6. Get a spare bowl too, and also zip tie some thick rubber around the bowl to protect it.

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    I swapped out my nissan factory filter for the CAV296 when I had the 2.8TD engine. When the conversion to the Chev was done,Brunswick left the CAV in place. It wasn't until I added flowmeters to the diesel supply and return lines that I found out what the engine fuel system was doing. Long story short, the CAV296 is rated for 42LPHR, so it might be a good check to check what your engine demand is before swapping to the CAV - I liked the CAV as its glass bowl made it easy to spot water, however it was way under size for the Chev in N/A format and totally undersized for the S/C. I now run fleetgurd units rated at 300LPHR with a lift pump rated at 440lpHR. I expect demand to be around the 180 - 200LPHR thru the filter, with maybe 90% going back to tank
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    Quote Originally Posted by mudski View Post
    In your case Cuppa, or any case that see's someone being off road a lot and buying fuel from god knows where, a pre filter would certainly help. No doubt. But, for the majority of shopping trolleys, its not really a necessity, in my opinion.

    If you are going to put a secondary filter on though. The CAV's are good. They are 12 micron at 99% efficiency, so it filters fairly fine particles but may not be enough for the CRD motors. The filters are dirt cheap too, about $6. Get a spare bowl too, and also zip tie some thick rubber around the bowl to protect it.
    Yep not recommended for common rail motors, & unnecessary for cars that get their fuel in populated areas, but filtration is a bit better than 12 microns I think, at least according to this according to this.

    screenshot_106.jpg

    Mind you I have read claims they are as low as 2 microns elsewhere on the 'net (have my doubts about that though - I would think that may well affect fuel flow). My guess is that along with the variety of brands of filter that fit these CAV type housings there is probably a variation in micron ratings. Bottom line for me is that it works as per my previous photo & with no fuel flow issues using the stock GU fuel pump & no additional lift pump. That photo was after around 10,000kms. As a result I decided to change the CAV every 10,000 & the standard filter at 20,000, I'm yet to do that though. If I have the means to cut open the standard filter when I next change it I will, & if it looks clean enough may up the next change interval of the standard to 30,000kms.

    2006 4.2TDi ex-Telstra Remote area Camper. 425w roof mounted solar, 360Ah Aux batts, BCDC1240, Onboard hot & cold pressurised & filtered water, (25 litre hot water calorifier), ARB fridge, ARB freezer, Built in kitchen, 240v, 3 Genie exhaust + dynotune, 2 lift, Lovells GVM upgrade, ROH Blaktrak steel wheels, Bridgestone D697s, Redarc gauges/pillarpod, Hema HX-1, CB, dual rear view cameras, Onboard 30amp Victron mains charger, second glovebox, dual seat conversion, Tyredog TPMS, Boss PX7 onboard air with 9 litre tank, 350w inverter, Steel bullbar, Harrop Eaton diff lock (front), Warn winch, Snorkel, Dual spares , 160 litre water tank, 2010 Tvan Tanami. (incl another 70 litre water tank) with matching wheels/tyres (& 3rd spare)
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    Good experience and knowledgeable comments guys.
    I am planning a trip to remoter areas latter this year and need to put a secondary fuel filter/separator system on my 2014 CRD Ute, and the stand alone OEM filter doesn't fill me with confidence. I know how important it is to keep that fuel clean and enough volume for IP etc.
    Anyone have links, names etc. of systems i could look at? want to start pricing it up.
    I can install it myself, it's not not a drama if it's before or after OEM filter. Just want to look at some option and work out which is best value for money.

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    Quote Originally Posted by ChadGU View Post
    Good experience and knowledgeable comments guys.
    I am planning a trip to remoter areas latter this year and need to put a secondary fuel filter/separator system on my 2014 CRD Ute, and the stand alone OEM filter doesn't fill me with confidence. I know how important it is to keep that fuel clean and enough volume for IP etc.
    Anyone have links, names etc. of systems i could look at? want to start pricing it up.
    I can install it myself, it's not not a drama if it's before or after OEM filter. Just want to look at some option and work out which is best value for money.
    Talk to @mudski, he knows his stuff
    Manufacturer of the Complete Camp Oven System

    Website:http://davesstuff.net/

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    Quote Originally Posted by Cuppa View Post
    Yep not recommended for common rail motors, & unnecessary for cars that get their fuel in populated areas, but filtration is a bit better than 12 microns I think, at least according to this according to this.

    screenshot_106.jpg

    Mind you I have read claims they are as low as 2 microns elsewhere on the 'net (have my doubts about that though - I would think that may well affect fuel flow). My guess is that along with the variety of brands of filter that fit these CAV type housings there is probably a variation in micron ratings. Bottom line for me is that it works as per my previous photo & with no fuel flow issues using the stock GU fuel pump & no additional lift pump. That photo was after around 10,000kms. As a result I decided to change the CAV every 10,000 & the standard filter at 20,000, I'm yet to do that though. If I have the means to cut open the standard filter when I next change it I will, & if it looks clean enough may up the next change interval of the standard to 30,000kms.
    They claim it to be 5 micron, but at what beta rating? It might be 5 micron at beta 2, which is 50% efficiency. Which means the filter will let 50% of particles at 5 micron or larger through. Some filters will have multiple ratings, 5 micron at beta 2, 10 micron at beta 10 (1 out of every 10 particles will pass through the filter) etc etc.
    The beta ratings are as follows.

    Beta Ratio. How Many Particles of a Given Size Will Pass
    Through the Filter?----- Actual Filter Efficiency
    2 ---1 out of every 2 particles 50%
    10 ---1 out of every 10 particles 90%
    20 ---1 out of every 20 particles 95%
    75 ----1 out of every 75 particles 98.7%
    100 ---1 out of every 100 particles 99%
    200 ---1 out of every 200 particles 99.5%
    1000 ---1 out of every 1000 particles 99.9%
    2000 ---1 out of every 2000 particles 99.95%

    So you can have a filter will 2 micron filtration but it has a really poor beta rating, which is just as important than micron rating. If the Delphi is 5 at beta 75 or better, then I would consider it a good filter.

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    Quote Originally Posted by Cuppa View Post
    Notice they state not recommended for CRD motors. That tells me that the beta rating is poor. We sell 5, 7 and 11 micron filters suitable for CRD motors as the beta is suited...
    Last edited by mudski; 10th April 2019 at 09:01 AM.

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