When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I know this is the place to get an knowledgeable answer. I'm installing a dual carb system on my '37 Buick and was going to feed both carbs using a compression T fitting. I was told this wasn't a good idea, I was told I need a fuel block to split the feed. The person telling me this said he wouldn't trust a compression fitting on a fuel system or brake system. I whole heartedly agree with him on the brake system, never, ever use a compression fitting on there but there isn't much pressure in the fuel system, I thought I've read there is somewhere around 6 psi in the fuel system. The Buick has to be very similar to our old Fords.
Compression fittings are routinely used in plumbing applications where working pressure is in excess of 60 pounds, and test at over 100. There's one on my oil pressure gauge and it can hit 60-80 pounds, too. so I don't think the warning for fuel line usage has anything to do with pressure limitations. I really don't know if it would be an issue, other than the fluid in question is highly flammable. I will admit I don't think I've ever seen anything but seated connections on hard lines, at least not on the older stuff we work on. I have no idea what kinds of attachments they have on new stuff today.
There are compression fittings on my air compressor which riches 130+ psi. If it's a problem of the gasoline's flammability I guess I could make brake lines with double flares.
I'd prefer a flare fitting as well. The only real concern I've seen with fuel lines is to not use copper. Copper cam work harden and crack over time.
Although you will see lots of early cars; teens and twenties that have copper lines.
You can get a "T" fitting with inverted flare openings. You have enough left over material from those carb spacers you should be able to machine up a fuel line distribution block no problem....LOL
I'd prefer a flare fitting as well. The only real concern I've seen with fuel lines is to not use copper. Copper cam work harden and crack over time.
Although you will see lots of early cars; teens and twenties that have copper lines.
You can get a "T" fitting with inverted flare openings. You have enough left over material from those carb spacers you should be able to machine up a fuel line distribution block no problem....LOL
Bobby
I think I'll go the easy route and buy a brake line T
I used the flare fittings on my 40 Buick with dual carbs and at maybe 5 psi no leaks at all.
Do you have any pictures of the set up?
Originally Posted by bobbytnm
Quitter.....lol
Quitter?!!!! Come on Bobby, you know what I've done
My leveling blocks for the carburetors, not bad for a guy with a block of aluminum, hole saw, drill bit and power miter box saw. Well, also with a friend with a mill.
Here's what looks like a either a factory or shop manual drawing, looks like flared fittings.
Well, here's my set up so far. I went with 3/8" because I couldn't find 5/16" flare fitting any where. I found 5/16" brake line everywhere but no flare fittings.
Like others mentioned, a flare fitting is a better (safer) option than a compression fitting when it comes to fuel. I switched to AN 37 degree flare fittings s long time ago on the pressure side of my fuel systems. I've had very good luck with sealing and not having to tighten fittings nearly as much as with 45 degree flares. Cost difference is minimal when using hard lines. The difference is the tube nut and sleeve for 37 degree AN instead of a 45 degree flare tube nut. There are inexpensive 37 degree flaring tools that work well.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
