fuel filter ?

Very common (and recommended) to install a pre-filter. There are several aftermarket versions available to choose from....Napa, Cummins, McMaster and others. Only trick is adapting to the Cat odd-ball thread at the transfer pump which is a ferrule type with 7/8-14 thread that will accept a jic "O" ring boss fitting and seems to seal ok even though it is not machined for it.

Here is a picture of a fitting that I made out of stainless. I built it so that it would seal on the same surface as the orginal fitting, then I used a flare fitting on the other end so I could use areoquip type hose, plus I hate pipe fittings.

There is a -12 37 degree flare on one side and the cat 7/8- 14, 30 degree flare on the other. A long bulk head could also be adopted by recutting the taper which is not stright BTW.

Hi CR,
I don't follow you on that last statement " the taper is not straight" can you elaborate?

Hi CR,
I don't follow you on that last statement " the taper is not straight" can you elaborate?

Very common (and recommended) to install a pre-filter. There are several aftermarket versions available to choose from....Napa, Cummins, McMaster and others. Only trick is adapting to the Cat odd-ball thread at the transfer pump which is a ferrule type with 7/8-14 thread that will accept a jic "O" ring boss fitting and seems to seal ok even though it is not machined for it.

Old mag i appreciate your info, i've already converted all my old cats to air quip truck line but i left about two inches of the half inch copper line with the cat ferrul on it and i syl flossed a fitting on it to go to braided line much better than the old cat pipes to the tank. would it be better to leave the socks in the housing as second dary filter and change them maybe yearly
or leave them out all together since a cummins fleetgaurd 1000 is 10 micron and water seperator in one ? thanks again for everyones input.

You have done the same thing that I have done on most of my tractors, reused the ferrule and converted the fitting. I still run the sock filters. It always
bothered me that the relief valve on the transfer pump would recirculate junk over and over through the pump until Cat finally figured out that relocating the relief valve downstream of the sock filters would take care of that.

CR, never noticed the double angle, other than might be interpreted from worn seating. Certainly isn't required.