Inliners International Forums General Discussion Hi Performance Dual Fuel System

I'm interested in a system for the '67 K/10 Suburban, that would run on propane primarily but be selective to run on gasoline when needed. My friend tells me this is not possible w/o changing carbs, jets, blocking off fuel lines etc. Too much to do on the roadside or in the dark. I thought a dashboard-switched sytem had existed since the mid 1960s. Is he correct that switch -on -the -fly is not possible or at least very expensive to configure?
Currently there's a 454 V8 in the rig, but I'm thinking of rebuilding a '63 292 L6 @ .030-over w/propane pistons...

It is very possible. My brother works for a propane co. and in the 80's he converted many vehicles to the dual system. He had his car on dual fuel at one time. The best I remember there was a panel under the dash that had a choke cable like thing and a couple of switches on it. Yes you could switch from one to the other on the move. How it all hooked up I have no idea. The small tankes were made to go in the trunk and not occupy the entire area. It is very possible but I don't have any idea about the cost. Hope this helps.

Check out half the cars in Australia nearly, ha ha.. they run dual fuel all over there. One of the cars I imported was dual fuel ever (I took off all the propane stuff)
You just have to have the mixer and what not mounted along with the carb, flip of a switch to activate the propane solenoids and what, and you are set.
Be sure and hard hardended exhaust seats though when running on propane. You'll love how clean it keeps the engine too though

does anyone know of a set up diagram for this, or a link ot a how to site?

Thanks, Guys,
I thought I wasn't nuts, but you never know. Maybe more info will surface in this thread?
What info I've got came off this site:
www.wps.com/LPG/
But no visible schematics to adapt a '67 Chevy 292 L6.

We use a man lift at work that is dual fueled. I will find out more about it including its make and model. Maybe you could get its service manual and get some ideas. i do know that its a GM inline 4. Sorry I dont have more to add for now.

That's right. Iv'e used forklifts that were propane/gasoline powered. Usually you have to lift the seat up to get to the motor then open or close the gas fuel line and close or open the valve on the LP tank to select fuel type desired. I'm not sure if there is also an electrical switch to throw.
Thanks.

Dual fuel has versatility as an advantage, BUT you will have some disadvantages as well. For example, your ignition timing will be a compromise, that may not be perfect for either fuel. Gas requires heat under the carb; LPG does not like the heat. Your fuel economy will suck. You can't have it both ways. My experience was that I started out with dual fuel, mostly because I was afraid to convert to LPG "cold turkey". But after I got familiar with propane, I converted to straight propane.

Is propane more efficient the gas? What would be the benifits and cons of a switch? Besides its cheaper at the pumps for the time being. Hey 68OrangeSunshine did you find any swap info that could be applied to are six?

I answered my own question with a search, Found this article that helped inform me better.
http://www.wps.com/LPG/LPG-book-final.html#WHY%20LPG?