Fuel drain cock leaking, help needed please.

[mciikurzroot]

I have a friend who has a 805B set, the actual fuel tank drain that protrudes thru the skid frame rail is or was leaking, he drained the tank and set out to find a bung or plug where when its tightened it will swell up and seal the tank from draining, no Auto Parts store offered a read fix so in his wisdom he bought the closest size and overdrilled the tank wall to where this new stop or filler plug would fit and seal off the tank, never mind he took away the tank draining feature, well we know where this is going, the material the new plug is made from lasted a few weeks and then deteriorated because it was made for water and not DIESEL fuel, to the point now the tank is leaking pretty badly.. I'm sorta out of suggestions to offer him on what or how he can seal the hole and or if or where we can buy a real diesel rated plug ..
All suggestions welcomed and maybe i can help him get this solved..
Thanks again, mac/mc

 

[Guyfang]

Mac,

Great thread in the forum. Look at:
The infamous Well Nut info

 

[Jeepadict]

If it's the external bung o-ring leaking,, the first trick I would try is to to change out to a Viton ring. Research the part he installed to find the proper size.

If the bung has failed for some reason, have him refrence the "ultimate well nut repair" to see parts and techniques that are known good fixes. He'll obviously have to get an oversized part since he opened it up.

Ultimate well nut repair

802a. I couldn't bring myself to fix junk with junk, not on my machine. Maybe a grass cutter.Nitrile or not those things are doomed. This even comes with a viton o-ring. Here is the permanent fix. $10.99 + S/H You do need to remove the fuel filler so you can get your arm in the tank. I was going...

www.steelsoldiers.com

Sent from my SM-G970U using Tapatalk

 

[Light in the Dark]

What did he open it up to Mac? I would find an appropriate sized brass bulkhead fitting with oversized washers and seal it up best you can.

 

[Guyfang]

There should be standard sizes. You may need to get one slightly bigger then the present hole, drill the hole to that size, and then insert it.

 

[mciikurzroot]

What did he open it up to Mac? I would find an appropriate sized brass bulkhead fitting with oversized washers and seal it up best you can.

.750 3/4" this is a solid answer i just might offer to him thanks much

 

[Light in the Dark]

Well most of these are NPT so I am thinking he might need to open it up to .84" for best fit (1/2 NPT). Not sure if that even has a groove for a viton ring or not, but its at least somewhere to start.

1/2" Female NPT Brass Pipe Thru-Bulkhead

www.suremarineservice.com