What does it fit?

[jimbo913]

Ok, so as far as I can tell this is a special fuel cap and copper tube set which will connect to the auxiliary fuel hose on my 803A and similar gensets.

My questions are:

1- What does the cap fit?
2- What is the fitting size/type?

I am thinking that I will get another fitting like this and tap the tube and fitting into a 55 gallon drum cap so I can use it to draw fuel from my 55 gal storage drums during extended power outages. I also need to make a rain proof vent in the second drum cap so it does not cause a vacuum issue when pumping the fuel.

 

[Ratch]

It's for a 55-gallon drum.
That cap will fit the standard military fuel can (think 5 gallon jerry can), which should also be the same fitting size as a typical steel 55-gallon drum. The single tube will drop into the 5-gallon can, and then both tubes together will dip into the 55-gallon drum.

 

[jimbo913]

Thanks. I prefer the 55 gallon plastic drums for storage, and it doesn't' fit tight enough into those so I guess the threads are different.

Any clue on the thread size and type?

 

[Ratch]

Nope, not a clue! I know the plastic drums I use have a 2" thread because that's the PVC fitting I have in them. But I've never attached anything to a steel drum but one of these adapters and the cap.

 

[gunboy1656]

It is for the aux fuel on the generator. That goes on the fuel can.

 

[Chainbreaker]

Thanks. I prefer the 55 gallon plastic drums for storage, and it doesn't' fit tight enough into those so I guess the threads are different.

Any clue on the thread size and type?

I looked up a drum plug at Grainger and this is the description:

"Drum Plug, Round Head, (M)NPT Inlet 2 In., Steel, For Use With Steel Drums, Construction Steel, Includes Buna Gasket, Package Quantity 10"

So it appears that steel fuel drums use a 2" Medium National Pipe Thread. Therefore it seems the Aux fuel adaptor should fit a 2" polyethylene drum bung UNLESS the threads are much coarser OR the adaptor you have is not expanding the rubber gasket properly when the lever is flipped due to it having aged and hardened.

 

[Recovry4x4]

Did you flip the lever? It does fit cans and drums as they have the same thread. The lever squishes the rubber sealing it in the threads!

 

[jimbo913]

Yes, I flipped the lever. The poly drum threads are very coarse so that could be the difference.

My original question of thread size/type was not related to the drum threads, it was regarding the fuel fitting. If I can figure out the fuel fitting threads (coming out of the cap - hose side), I can buy another fitting and modify a plastic drum cap to make it all work.

Jim

 

[Ray70]

Plastic poly drums usually have 2 different bung threads. The finer one is a 2" NPT, so any standard PVC or black iron pipe fitting from Home Depot or where ever will fit that one. The other bung is a much coarser thread, I forget what that one is called.
Don't forget to outfit the drum with a vent of some sort.
Some of the bungs will have a threaded hole in the middle that isn't drilled completely through, you can drill a hole in that and the thread will be a 3/4" NPT that you can adapt to some kind of small vent to let air into the drum.
Steel drums usually have a 2" NPT and a 3/4" NPT fitting. Steel doesn't use that other coarse thread fitting like you find on poly drums.

 

[Chainbreaker]

My original question of thread size/type was not related to the drum threads, it was regarding the fuel fitting.
Jim

It is the same size as the fuel hose fittings; AN-5.

Everything you wanted to know about that fitting size and then some:

http://www.steelsoldiers.com/archive/index.php/t-82705.html

 

[Ray70]

Correct, the adapter is an AN-5 size fitting. I believe you can also use JIC #5 and SAE 5/16" flare tube since AN-5 is an oddball size that is difficult to source.

 

[jimbo913]

What I have come to find out on the plastic drums is there are MANY types out there. Of the 6 I had there were ones with too large coarse/fine thread, too large coarse/coarse thread (neither would work) and I found one with small coarse/fine thread which "may" work if I cut off the lip above the thread. In its standard form the cap doesnt go in deep enough to grab.

 

[DieselGenAC]

AN and JIC fittings are both 37 degree flare fittings and are functionally interchangeable. I believe the difference is thread tolerance and long term fatigue resistance which is critical for something that flies. I don't think a generator or vehicle fuel supply will care.