Eric Hysteric wrote:
I bought an used IMPCO propane conversion kit. The kit comes from a GM and now i need an adapter between the IMPCO 300A Mixer and my Thermoquad 4BBL carburetor. Does anyone have a tip for me?
I went to the
IMPCO website and poked around.
In the Technical Support dropdown menu is an Installation Instructions webpage. On that webpage is Thermo-Quad Adapter Installation Instructions for part # AA3-64.
The general installation instructions references National Fire Protection Association (NFPA) pamphlet #58. I strongly recommend getting this pamphlet and reading it thoroughly. (
Weblink for the NFPA 58 .pdf file.) Have a bottle of aspirin on hand because it's in the typical standards/regulations format and uses technical jargon extensively.
Note: At the bottom of the general instructions is a prohibition against using Teflon tape on fuel fittings. (Bits of tape can come loose and plug propane orifices and mechanisms.) Presumably, use paste-type Teflon pipe thread sealant --
sparingly -- instead and only on external threads. (Use on external thread will push excess sealant outside the fitting instead of into the propane system.)
Verify what I said in the preceding paragraph with other sources ... while I have significant experience with household propane systems, I am
NOT certified. (One company tried to hire me and offered to send me through certification training, based on their impression of the propane system in my cabin.). Likewise, I've
never had any experience with motor vehicle propane systems, other than research into what you're doing.
Impco's
Carter Thermo-Quad Conversion installation instructions, for p/n AA3-64, 'recommends' against using the conversion kit on carburetors with black plastic float bowls. (They imply propane could compromise the plastic.)
The Impco webpage Product dropdown menu has a link to a Catalog & Parts webpage. That webpage has links to Carburetors & Mixers and Adapters .pdf files, which probably has most of the info you need. (You may also want to download and peruse the complete Master Parts Catalog .pdf file.)
I strongly recommend doing more research, beyond the little bit I've done, and educating yourself.
