Dual Fuel Tanks

[Delizia DiGatti]

I have a 1973 chinook, and I cannot figure out how to switch tanks. Would I be looking for a switch or a lever, and if so, where? Any tips are appreciated. thanks

[John "T" Nordhoff]

 It could have EITHER a toggle (or push rocker) switch or a mechanical lever. I have seen them (mechanical) located on the floorboard somewhere near the drivers seat or near the dash or lower part of dash near drivers seat (electrical). Some older GM based had them (switch) on the dash close to where the radio etc is located or else near the glovebox. The switches were often labeled Main or Aux Fuel. It may be a 2 poisition (Main/Aux)  push rocker type switch instead of a toggle 

 My best guess is you have an electric solenoid type with a toggle switch located somewhere??? versus a mechanical, because if they have Supply and Return Fuel lines (more modern vehicles) that requires more valves and isnt practical for using an old fashioned mechanical selector switch

 I have seen those switches fail and stick in one position or the other if not used and exercised frequently or if an electrical connection fails. Whats even more complicated is if each tank has a working fuel gauge becasue the switch has to switch gauges also

 John T  Ive been on a 6 week road trip to 5 Natl Parks so haven't had the ability to check in lately

[Delizia DiGatti]

John

Thank you for the great tidbits. After reading this, I found an unmarked switch low on the dash next to the vent levers. It is a chrome joystick shaped switch, but it does have the potential to be in three different positions. There once was dymo tape there, but it had been peeled away. Experiments to come.

Many thanks again, and EXCELLENT road trip! You are so cool.D

[John "T" Nordhoff]

  If it was a factory original GM or Ford etc switch it would only have been 2 position Main Aux but if the camper maker installed it they may have used what was handy or they had in stock a 3 position center off toggle, yet it could still work one way main other way aux but the center off wasn't really used. If it switches BOTH the tanks plus the gauge (I DOUBT IT HAS THAT) it would have like 6 connections instead of only three necessary for tank only switching. Somewhere underneath you could find the switching solenoid. It will have like 3 rubber fuel lines (Main Aux Engine) plus wires going to it up to the dash switch

 Best I can do over the net

 John T

[Delizia DiGatti]

So, it sounds like pulling the switch and looking at the wiring would tell the story?

I will be off work in the next couple of days, sounds like I will be crawling under the rv.

But, I love an adventure and a challenge.