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Yes, pittsburg diesel sells them. However, I don't believe they'll work with the emergency cut off. Also you'll pay ~$100 for the kit from them. Or about $40 if you just buy the lines/fittings from a parts store and make it yourself.

Cummins people will have no clue what you're talking about without the engine number. The "Big Cam" engines came with the dual fuel line setup stock.

I will have to dig around or take mine apart to figure out the - (dash) size. JIC or AN fittings have their own sizing.

I tried heat, but didn't have much luck. Of all things, the trick of the valve lapping compound worked wonders for me. I'll keep that one in my bag of tricks now always!

Pump bolts? You mean the fuel rail ports on the head? I tried that. Shattered a bit. Problem is, they're so small.

Parts I used are listed in this thread:

M809 and M939/M939A1 configs would have the same NHC-250 engine. Only a M939A2 config would have the Cummins 8.3.

Complete parts list here: http://www.steelsoldiers.com/showthread.php?93233-Duel-fuel-line-mod-M818-855-cummins Can be made for less than $40 at any parts store.

From earlier in the thread.

Just know that your emergency shut off will no longer function.....

2400 is max governed RPM the military uses for testing purposes. https://redriver.army.mil/contracting/solicitations/Closed/FY09solicitations/09T0012/OQEM939SeriesEngineDyno-NHC250.pdf They also run the engine at full load 2150rpm for testing purposes as well. (2100rpm at 220hp for 15 minutes...

Thanks again Ron. I didn't hear you the second or third time.

The OP did, but honestly I think it works in your favor to leave it like I did. (Think about how the button works)

I honestly never took a video of it before hand, but it's notably different/improved. The port on the bottom of the head is the supply port. If you look at the first pic, you'll see the second (return) port to the top left of the brass fitting.

Here's a video of it revving as well. http://youtu.be/6QsAxvCRsvo

Some pics of my install. First the twisted up allen key. But notice the plug came out no problem. A dab of valve lapping compound saved me on that one. The doghouse has too large of an area cut into it. But I've since folded the "door" back down, put the foam/plastic insulation back on...

In the 5.9 performance world (and 6.7). It's very common for the "rail to drain". The solution is to plumb in dual CP3 pumps.

Maybe I should expand my last response. I *might* have added 10hp to the truck. For a cost of $40. Your idea might add 11hp for a cost of $400. Cummins big cam trucks have a dual feed line setup like this that supports 400hp.

Honestly no, I don't have any part numbers. I simply walked in and knew what I was looking for. From the emergency cut off valve I used the following parts. JIC flared fitting to 1/4" NPT adapter 1/4" NPT tee 1/4" NPT to 3/8" inverted flare adapter (two) one 20" 3/8" inverted flare steel line...

I don't believe the benefits would outweigh the cost of that.