Fuel Leak - M923 with NH250

[98G]

Inexplicable fuel leak between the two halves of this piece. I was thinking the O ring wasn't properly seated. I cleaned and reassembled it, ensuring that the O ring properly seated. Upon starting the truck the leak was back in full force, spraying.

I almost think there should be a gasket between the two halves.

What am I missing? Truck is an M923. 2007 date code NH250.

Thanks

 

[Castle Bravo]

Is that on the back end of the PT pump?

 

[Castle Bravo]

6 5330-00-809-2667 15434 100099 .o-ring part of kit p/n 3010240
7 5340-00-951-3536 15434 202897 .disk, solid, plain
8 5330-00-809-3276 15434 139988 .o-ring part of kit p/n 3010240
9 5365-00-965-0870 15434 160514 .spacer, ring part of kit p/n 3010240

 

[98G]

Disassembled, reassembled again.

RESOLVED! No more leak.

Thanks Matt.