I have a  lots of rust in the Diesel Tank of My 1951 D4. I am planning to put on a outside tank filter. I need to change the fuel filters. It takes 4.. I have 2 D4s. I am looking for 8 filters.. Where can I buy these? Thank You   

The original part number from Cat for the set was 7B8264 and I got my last set at NAPA. This is the original "sock" type. About any supply house can cross reference to them as there are several places that still can get them. Good luck on keeping the fuel clean as that is an absolute necessity. Don't remember the NAPA #.

PS:  Seat or side tank?

the dealers still have both types. the second is spiral wound cord.

Hi molar,
The part number for the filters is 2A5886 x4 and you will need 2 x 7b7635 as that group number is not used now.

Regards

Both D4s have seat tanks. One is clean the other sat outside 3 yrs and developed lots OF RUST. i DON'T know for sure how to clean it. Do the best I can and install remote filter back by tank outlet. Its real bad plugs filters in a few hrs time.   

do you have a mate with a steam boiler? if so remove the tank drain it and have it steam blasted. the other way is get some dog chain or a couple of handfuls of small steel nuts say 3/8 to 5/8 and chuck them in the tank with some alkaline degreaser or cleaning vinegar and roll the thing all round the yard make sure every side is well agitated. drain and repeat a few times, remove the nuts/chain then rinse with hot soapy water and let dry in the sun having a heat gun or hair dryer blowing into it will speed the dry and get it properly dry.

depends how bad it is but it might be worth treating the tank with fuel tank sealer such as red-kote or the por15 u.s standard tank sealer or a similar product.

Might be worth installing a different tank if its real bad. I see your in MN too. There is a guy in Harmony who parts out these machines and might have a replacement if you decide to go that route.

I've heard of people rigging the tank up with chanins/bolts/gravel iniside to a rear tractor tyre and driving around doing chores for a day.
Take off and drain/refill with clean diesel/reposition a few times. That's supposed to dislodge whatever rust is inside there.

thats the less labour intensive method. and it works well with square or rectangle tanks. you do need to turn it part way through so you get all sides.

I have also heard that people have rigged them up a cement mixer and let it go for the day, with nuts, bolts, chain or gravel then cleaned them out and walla loverly and clean.

Regards