and more...
and even more...
Thanks Victor for posting the pictures . The last picture shows a grounding screw on the gas tank filler neck . There is a nut welded on the filler from the factory . A.J. says his mechanic grounded his Royale at the sending unit .
My fuel sending unit needs to be cleaned and reconditioned . To me it looks complete and no major damage . I will keep everyone up to date on the repair process and where it was done . At least we have a picture what it looks like for future reference .
Super unique design on that specific King-Seeley hydrostatic fuel sending unit. Yours certainly needs a refurb but is far from the worst I have seen. Many many issues are attributable to overtightening the air/fuel lines and not using 2 wrenches (also allowing the caustic fluid in the gauge to dry out). The brass connections should be a gentle hand tight only as overtightening will actually introduce airleaks and then the system won't work. Below is a basic understanding of the system

@Abbott-Instrument-Restoration Awesome. Thanks! I converted your PDF to a JPG as it displays better on the forum. Also added it to the libarary.
Hopefully there is a special place in hell for King Seeley.
@alsancle Hahaha, that made me laugh. Yeah the system is quirky but it does work and lots of vehicles used this design. You can certainly get the gauge functional and accurate but all 3 components need to be in perfect working order because if there is an issue anywhere, then the system will not function (the 3 components being the gauge head, the airline + fittings and the sending unit). Happy to help if needed

@Abbott-Instrument-Restoration I agree. But I would say 20% of the gauges out there are working correctly? The Phantom II RR used something called a Hobsen Telegauge which was licenced from King Seeley. A couple thousand bucks later we had mine working. Again, special place in hell...
