ol' 93 12 valve

My 91.5 is leaking diesel from above the fuel filter. I know there is a large o-ring above the filter that must be worn out. I have tried to get to it before but I couldn’t unscrew the plate that’s holding it in. I think it’s a large flat head. If im wrong please correct me. By the way it takes 20 seconds to start in the morning. Could there be another leak?

Any help is much appreciated.
Thanks

93beater

mine started a small diesel leak from the lift pump, im guessing there is a gasket behind it against the block <correct me if im wrong> also my full power screw's o ring was messed up from screwing around with it a lot bob sent me a couple o-rings for it that stomped my hard starting problem!! good luck

ol' 93 12 valve

I fixed all my other fuel leaks that i know of. I just cant seem to get the right tool for the job, so i can fix the o-ring. I think its the fuel heater.

bgilbert

A drag link socket will work for the filter adaptor or a LARGE screwdriver. A large chisel, piece of metal fabbed to fit, you name it. Prybar and wrench from the bottom of the truck can work as well.

The square cut o-ring can be ordered from Cummins or your local Dodge dealer with the part number, I think it's available in the sticky or via a search.

ol' 93 12 valve

I had tried before with a really large screw driver but it didnt budge. Than i took a piece of plate steel and tried that, still didnt move. I didnt know if there was a special tool or certian way of doing it.

winkdemon

if u go to a cummins dealer u can buy the right tool ther around 30 bucks ... i just made one with a socket and a roll pin

rockfoot

I removed mine the other day... it was a real bear... finally got it with vice grips... had made up my mind that I was gonna ruin it and was gonna replace the spud... Me and a jewlers file straightened out the threads in about 30 minutes and that fixed it... no more leak....

BearKiller

I can't take credit for this idea; but, someone made a real neat wrench for this purpose by doing some minor grinding on a hex-shanked spade drill-bit.

That idea would work real good, as the pointy end will go into the center of the stud and keep the bit captured in the slot.


The first one I removed, I was able to get it loose with a piece of flat steel.

The next one was super tight and bent my steel like it was plastic.

I took the grinder to one of my hex-shanked cold-chisels and made a perfect fitting edge on it; I was able to use a standard box-end wrench on the hex-shank of the chisel and it worked perfect.

Occassionally, I run into one of these that accepts an Allen-wrench.

maxx250

I had the same leak about a year and a half ago,the problem I had was I couldnt unscrew the fuel heater because the plug fitting would not clear the block to unscrew it all the way.One of the guys on here told me to file that fitting down a little and it would clear.I took a dremel to it and it came right off .There is an o-ring up in there ,mine was leaking like crazy.I got an o-ring from Cummins Atlantic,screwed everything back together and havent had a problem since.

BearKiller

The heater itself need not turn as the stud that holds it on is what screws out; the heater/plug should not have moved/turned, as it is a seperate piece, not attached to the stud.

There are NO threads anywhere on the heater.

stacked12vdodge

im havin a lil leak with mine too i have a 93 .....around the fuel filter and maybe around my pump.....but i also have 245k on my truck with stock pump