abachar

Before I realized that I should be loosening the small bolt when bleeding the fuel line, I loosened the big bolt and got a steady flow of fuel and got the truck started. However I noticed a leak from the under the VE that stopped after a while. Is this some sort of pressure regulation causing this leak? Bad?
Thanks.

NotEnufGarage

That's probably the o-ring on the throttle shaft. If it stops, you're good. If not, you'll need to take the top off the pump to replace it. If you haven't put in a 3200RPM governor spring, that would be a good time to do it.

BearKiller

I agree; it looks like the throttle-shaft O-ring may be leaking.

My truck had an intermittent, sometimes quite healthy, drip from the throttle-shaft, and the wife's had a drip from the end of the KSB gizmo.

While I was waiting for time/weather to tear into each of the pumps and repair the leaks, I read up on adding 2-cycle oil to the diesel fuel for lubrication purposes.

After a few weeks of 1-oz/gallon mixture, both of our leaks went away and have not leaked a drop in a long time.

It may be all coincidence, and both trucks may start pouring a leak before dark, but I believe the 2-cycle oil somehow "conditioned" the O-rings, thus stopping the leaks.

abachar

Once I put the new lift pump in I am going to run a tank of B100 and twist on a new filter to clean up some of the gunk in the lines. My guess is that this would also help the lubrication of the O-rings if it indeed works.

3200 spring is on the list when I get more confident.

Thank you both.

Tron

The throttle shaft bushing could be worn and with a old seal causing the leak. Change to a 3200 spring and change the seals and you should be good to go.

NotEnufGarage

It isn't so much that the o-ring needs lubrication, rather they need aromatic spirits (like acetone, toluene, etc.). These use to be plentiful in low sulfur diesel, but we're now burning ULSD. In the process of removing the sulfur from diesel to make ultra low sulfur diesel, most of the spirits are removed. Adding some waste motor oil, diesel kleen, standyne, or whatever to every tank will replace these spirits and lubricate your pump and injectors, and keep the rubber seals (o-rings and gaskets) from shrinking due to dry fuel.