Petcock still leaks!

[Detroit Diesel Man]

So I put a new OEM o-ring on the petcock base as well as the 2 washers for the bolts and I still have a slight leak from the tank..I inspected the tank and its flat and clean before I installed the petcock..anyone have any tricks for this? I even tried thread sealant on the bolts and didnt help..


DDM

[Steve]

Are you sure it's leaking from the mounting surface?

It could very easily leak from the inside, which would show up around the selector lever or the vacuum diaphragm.

.

[81ZUKI75]

Petcock Mounting Washers

What kind of washers did you use? Steel washers will leak (DAMHIK). The specified washers are the "oil gallery exhaust" washer which is a steel OD with inner ring of rubber. I've gotten by with "fiber" washers from the local hardware store too but hard washers won't work, at least for me.

[Detroit Diesel Man]

Yeah its leaking from the bolt holes...a drop on each bolt head..I used OEM washers from bike bandit..steel outer rubber inner..directly from the parts breakdown on their site. and used a new OEM o-ring for the main body.


DDM

[Guest]

Try some Hylomar on the threads. It's gas resistant.

[Detroit Diesel Man]

Well not long after the last post by Chef I figured out my issue...I had full thread bolts holding the petcock in...duh!..fuelwas slowly wicking its way down the threads and their would be a dropon each head of the bolt in the morning...switched them out with stopped thread bolts and after 3 days of sitting with a full tank no leak...geez..dumb mistake

DDM

[1_v8_merc]

Yeah i had my bolts leak too, I forgot to put the washers on, put them back on, tightened it better, and Permatexed the **** out of it.....haven't heard from it since!