The bottom most fuel inj line is driping diesel fuel between the heads, right where it connects to the pump, had it all torn apart today, tried 3 times to get the line to quit, it did quit for awhile, but started up driping again tonight. Any ideas, new inj line needed? or new fitting on the pump? Pulling the pump is more than I can manage and I really need the truck to be on the road. Thanks Mike

I know this may be a stupid question but is the line tight enough?I know that some of the line on the bottom of of the injection pump are hard to get a wrench on to tighted properly.I had leaky line on the bottom that I had to remove two line next to it in order to get a wrench on it to tighten it up.There is alot of pressue in the lines and they have to be tight.

it is as tight as I can get it, I also had to pull the intake, pull the two lines above it, if anything its tighter than the two I had to remove to get to it. The previous owner just had the head gasgets done and I am wondering if the compression fitting on the line itself got nicked when it was off the engine. Might have to order a new injector line.

The cup or cone could be cracked.

If the injector line is tight then maybe line line is messed up like you said.But the end of the lines are pretty strong and it would take alot to damage them.Or there may be a piece of debris or something on the line keeping it from seating properly.If you are interested I have a full set of used injector lines I would sell for $25 + shipping

I didnt see anything wrong with the the end of the line, but then I didnt take it completely off of the truck. That is the next step, can see the fitting on the pump very well being on the bottom, when the weather permits I will pull it all apart again and remove the line completely and see if its damaged or if there is dirt in the recieving fitting. Thanks Mike

It may be hard to tell on the truck, but there is a weep hole for each of the injector line fittings on the pump. The head could be leaking out the weep hole. I certainly don't reccommend trying to tighten the fitting up, you will probably make it worse. It could be a bad fitting too.

What it all boils down to is you pretty much have to pull the pump the way I see it.

If the line tip is clean, the pump fitting is clean, and the line is straight with the line nut, and the line is not cracked then there should not be a leak. Has the nut been cross threaded? Remove the line and use a magnifying glass to check the line tip and the pump fitting for any damage. If the pump fitting is damaged I would think that it could be replaced.

When I changed our pump, I thougth the lines were fine and no leaks were showing. A week later we left on a trip and on our first stop (about 125 miles from home) I smelled diesel. It was at night, but I could see which one was leaking by using my flashlight. It was the second from the top on the left so I was able to get a wrench on it and tighten it up. Never had a leak since that time.

When everything is right, you don't need to overtighten the lines. An end wrench is sufficient. A 5/8" crowsfoot, 6" extension and a short 3/8" ratchet is all I ever use.

If it leaks, something is wrong! I've seen cracked line nuts, dinged pump outlet fittings, etc. cause this type of leak. Check carefully. Also, TGD, does the outlet fitting have something in behind it that could fall out if you change it on the engine? Spring, check valve, etc.?

Nothing at all behind it on the DB pumps. It seals against the Head just like the line seats to the fitting, only much tighter.

Not a good idea - but safer than on a gas engine with 20,000 volts (that's a pun)

Try looking at the injector itself. The (what's it called?) throttle shaft? that rotates as the throttle is moved can get oblong after much wear. Hard to see the fuel coming out the end of the shaft, but it leaks down the hose and accumulates between the heads on the block - smells like a kerosene stove, eh?

If that is the case I only know it probably needs a re-build on the injector pump housing - tho' the culpit is a simple reaming out of the shaft hole.

Forgive if my terms are wrong. You can test by gently pushing on that shaft with a wooden dowlrod or even your fingers.

Dennis

Early 6.2 pumps had problems with leaky throttle lever bushings, they were originally brass, you don't have to ream them, replace them with the updated steel ones.

Guide stud in the back of the governor cover can leak too, so can the transfer pump cone on the back of the pump or the inlet fitting, and pretty much any one of those will make fuel run down to the lower high pressure lines and make it look like one of them is leaking. You might try some good strong degreaser all over the pump and then wash the engine with a pressure washer and dry it with compressed air and see if you can determine for sure where the leak is coming from.

My bet is your going to have to pull the pump to get the leak fixed.