August 10th, 2022, 08:25 PM
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Senior Member
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 386
Rep Power: 183
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Re: '65 GMC 1500 project. From the Netherlands
Another piece of the puzzle is completed regarding the liquid propane conversion.
I added the filler hose and filler attachment which are hidden behind the license plate. It runs to the tank.
From the tank, a copper line is run to supply the converter. It first has to pass through a valve, which combined with the solenoid on the tank, turns on or shuts off the propane supply. The gas supply is controlled by the electric fuel pump and electric gas shut off valve.
I've also almost completed the wiring harness for the pumps and solenoids. The wiring has a relay that is enabled when the engine is turning. This is done via an induction pulse from the coil. With a switch under the dash I can change between gasoline and propane fuel.
I've added a second choke cable to operate the mixer on top of the carburetor to switch between gas and propane. This has to be hooked up.
Top tip: the 60-63 repro choke cable is a deluxe cable with a chrome bezel. Removing the bezel doesn't give you a standard choke cable with the serrations... Unfortunately.
In this conversion, I try not to modify the existing parts. I also use whenever possible, existing holes to mount parts onto. This way these modifications can easily be reversed and it keeps everything original, which I like.
All that is left to do now is to hook up the choke cable, complete the wiring and install the mixer with air cleaner. Then my fuel mileage triples (well the cost of fuel decreases that much
To view some links or images in this forum your post count must be 1 or greater. You currently have 0 posts. Maybe you should introduce yourself with a new topic?
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Last thing: notice those V6 badges on there!!! Finally had them painted and they pop! Now the whole world can know there is a big block V6 in my truck
Last edited by Prowbar; August 10th, 2022 at 08:35 PM.
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