CAV fuel filter

seafox · 18-10-2006, 23:35

Hi ,
I changed the primary (not the one attached to the motor) fuel filter today. You have to be a houdini to get to it. I want to move it to where I can keep an eye on it.
It will be a bit higher than where it used to be. Used to be under he level of the bottom of the fuel tank.
Does this height matter or does the pump in the motor overcome this?
cheers

Richhh · 19-10-2006, 00:04

Once the fuel line is filled and bled, it really doesnt matter where the filter is located.
Having the filter set above the bottom of the tank will require some means of pumping the oil through the filter set when you need to bleed air from it; a 12 vdc pump mounted near the tank is probably best for such air bleeding purposes.

seafox · 19-10-2006, 00:19

cheers,
it will still be at the middle of the tank in height so will bleed from gravity.
Thanks
Darryl

Alan Wheeler · 19-10-2006, 02:50

Providing you never have the misfortune of having to bleed when the fuel level is below the filter level. That will prove problematic. And chances are, when you HAVE to bleed, it won't be at a conveniant level of above the filter. So if I was you, I would try and get it as low as you can.

**Pblais** · 19-10-2006, 04:09

Racor makes a filter unit that has the water collector on the bottom and a small hand pump on the top of it so you can pull fuel into the filter. The stroke is about 3 inches. I have that on our second boat. That racor has the inlet about level with the top of the tank. It's in a place where it can't be any lower or higher. Some times you can't get a choice.

Our first boat has a Y valve unit for switching between fuel tanks and it also has a built in DC fuel pump you can turn on manually. The unit is located under a hatch in the galley sole below the bottom of either tank. That pump can then bleed the system. It's most handy when you have more than one tank. You can still get an air lock but the self priming pump can handle it in every situation I've run across.

delmarrey · 19-10-2006, 23:25

Quote:

Originally Posted by Pblais

Our first boat has a Y valve unit for switching between fuel tanks and it also has a built in DC fuel pump you can turn on manually.

Ours too!!!

Alan Wheeler · 19-10-2006, 12:03

Only problem is Paul, if Darryl can't get a CAV filter any lower, he won't have any room at all for the Racor. IT is a very long bodied unit. In saying that though, there are several other filters out there with the priming pumps fitted too.

KaptainKen · 19-10-2006, 17:54

Seafox;

My primary filter (the one not attached to the engine) is about two feet above the fuel tank ... in fact it is the highest point on the fuel system. I installed a "squeeze bulb", like the kind usually seen on outboard motor rigs, to help get air-bubble free fuel up to the fuel filter when I change elements.

Worked for me.

seafox · 21-10-2006, 02:39

I have installed it in a really easy to get to place. cleaned it and reassembled. bled the system and she started first pop.

Thanks for the replys eveyone.

18-10-2006, 23:35	#1
seafox Registered User Join Date: Jul 2005 Location: new zealand Boat: Lotus 10.6 Posts: 1,264	CAV fuel filter Hi , I changed the primary (not the one attached to the motor) fuel filter today. You have to be a houdini to get to it. I want to move it to where I can keep an eye on it. It will be a bit higher than where it used to be. Used to be under he level of the bottom of the fuel tank. Does this height matter or does the pump in the motor overcome this? cheers

19-10-2006, 02:50	#4
Alan Wheeler Registered User Join Date: Dec 2003 Location: Marlborough Sounds. New Zealand Boat: Hartley Tahitian 45ft. Leisure Lady Posts: 8,042	Providing you never have the misfortune of having to bleed when the fuel level is below the filter level. That will prove problematic. And chances are, when you HAVE to bleed, it won't be at a conveniant level of above the filter. So if I was you, I would try and get it as low as you can. __________________ Wheels For God so loved the world..........He didn't send a committee.

19-10-2006, 04:09	#5
Pblais Moderator Moderator Join Date: Mar 2003 Location: Hayes, VA Boat: Gozzard 36 - Bright Eyes Posts: 6,570	Racor makes a filter unit that has the water collector on the bottom and a small hand pump on the top of it so you can pull fuel into the filter. The stroke is about 3 inches. I have that on our second boat. That racor has the inlet about level with the top of the tank. It's in a place where it can't be any lower or higher. Some times you can't get a choice. Our first boat has a Y valve unit for switching between fuel tanks and it also has a built in DC fuel pump you can turn on manually. The unit is located under a hatch in the galley sole below the bottom of either tank. That pump can then bleed the system. It's most handy when you have more than one tank. You can still get an air lock but the self priming pump can handle it in every situation I've run across. __________________ Paul Blais s/v Bright Eyes Gozzard 36 37 15.7 N 76 28.9 W

19-10-2006, 12:03	#7
Alan Wheeler Registered User Join Date: Dec 2003 Location: Marlborough Sounds. New Zealand Boat: Hartley Tahitian 45ft. Leisure Lady Posts: 8,042	Only problem is Paul, if Darryl can't get a CAV filter any lower, he won't have any room at all for the Racor. IT is a very long bodied unit. In saying that though, there are several other filters out there with the priming pumps fitted too. __________________ Wheels For God so loved the world..........He didn't send a committee.

19-10-2006, 17:54	#8
KaptainKen Registered User Join Date: Jul 2006 Location: Vero Beach, Florida Boat: Endeavour 37 Ketch "Capella" Posts: 70	Seafox; My primary filter (the one not attached to the engine) is about two feet above the fuel tank ... in fact it is the highest point on the fuel system. I installed a "squeeze bulb", like the kind usually seen on outboard motor rigs, to help get air-bubble free fuel up to the fuel filter when I change elements. Worked for me. __________________ KaptainKen _________ "Quidquid latine dictum sit, altum viditur." - Anything said in Latin sounds profound

19-10-2006, 00:04	#2
Richhh Registered User Join Date: May 2005 Location: Pennsylvania Boat: Tayana 37, M-20/I-20 Scow Posts: 250	Once the fuel line is filled and bled, it really doesnt matter where the filter is located. Having the filter set above the bottom of the tank will require some means of pumping the oil through the filter set when you need to bleed air from it; a 12 vdc pump mounted near the tank is probably best for such air bleeding purposes.

19-10-2006, 00:19	#3
seafox Registered User Join Date: Jul 2005 Location: new zealand Boat: Lotus 10.6 Posts: 1,264	cheers, it will still be at the middle of the tank in height so will bleed from gravity. Thanks Darryl

21-10-2006, 02:39	#9
seafox Registered User Join Date: Jul 2005 Location: new zealand Boat: Lotus 10.6 Posts: 1,264	I have installed it in a really easy to get to place. cleaned it and reassembled. bled the system and she started first pop. Thanks for the replys eveyone.

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