The rebuilt Holley 4779 for my project arrived yesturday and someone was nice enough to through a fuel ling in the box. Trouble is the fuel line isn't the correct one for this carb. The spacing is wrong and the line to carb fittings are to large. From what I can tell the line that was swent is a 3/8" line and the carb may call for a 5/16". The local Advanced Auto store had nothing to fit it and when I look in the Summitt and Jegs catalogs I don't see a 5/15" fuel line set up for it either. Why is this such an odd size and what do I need to work around this problem.
I use good flexible,rubber gas line instead of the fixed steel line. No disturbing fuel line when changing jets! * Not recommended as the most durable or safest. Use at your own risk.
I think you are right, Ill will use a rubber line wherever possible. I learned that Holley has at least two different fuel line input fittings. They come in 5/16 and 3/8". There are all kinds of fuel line set ups for the 3/8" but nothing for the 5/16". I've ordered the larger fittings which will give me more options.
You should use a minimal amount of rubber fuel line under the hood. The only rubber should be between the frame and the fuel pump. Plus, you wont pass any NHRA tech inspection with that much rubber line No offence Mart, but that dual feed setup is outright dangerous. Not only for the fact that its all rubber, but you have it laying on the manifold to boot. There are a multitude of options for a Holley carb. There are two different spacings, one for a carb with a secondary metering plate and one for carbs without. Your 4779 should have a rear metering plate. I bend my own 3/8" steel line and use a brass "T" fitting. Doing it this way gives it a stock appearance. Here is a pic of Jennifer's 0-4779 on her 73 Mustang. I bent up the line from the fuel pump to the carb. Cost me all of 10 bucks. And you'd swear it was factory.
No offense Jason, but Aeroquip has been making flexible fuel line since the 70;s. They make push on fittings designed for fuel applications that have no need for any clamps. The line you see is not even touching the manifold, and the tee is custom made without any sharp corners inside to flow around like the tee on yours. I just change the line every 3 or so years. Easy enough to do. I like the better and improved more than stock look! Those bowls come off easily.. Whatever trips your trigger I guess.
No offense Marty, but based on my fuel systems design experience in the last 15 years, Jason is absolutely right. I wouldn't let that setup out of my driveway. You don't even have any proper support for the hose to prevent abrasion, not to mension the zero flame resistance of the rubber line. I hope the clamps are over SAE hose beads and not triple barbs...another common no-no. Devon
Thanks Devon, the clamps are over hose beads, not barbs, the line is a good 1-1/2" away from the intake. Nothing to abrade, nothing is moving. Believe me, I watch everything very carefully. Thanks for the concern guys. I guess I shouldn't tell you guys that I also make my own custom fittings and fuel line gaskets, and aluminum filters too. Heck, I even make my own driveshaft strap style clamps. I wasn't happy with the cheap u-bolts. Just me I guess....
Good to hear, but just consider what the uninformed Joe might do with his car seeing your pics and not understanding the right way to go about these things. Is the block permamently mounted? That would be a good move too. Devon
The fuel Y isn't mounted, but the custom alum. fuel filter below that, is! So it keeps thing supported. Devon; we'll have to get together so you can examine my handiwork. You might just give me a passing grade.
Please don't use rubber fuel line in the engine compartment, even if it's just for the sake of what can happen in an underood fire. Most people don't realize the typical "high performance" braided stainless over PTFE is no better. I run a braided stainless over PTFE underhood, but mine has a coextrusion of ethavin over the braid, which is a heat and abrasion resistant rubber. If I didn't have access to this material, I would build the top side plumbing in steel tubing as Jason has. Devon
