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So I bought a 780 CFM Holley carb to try and needed a fuel feed line came today guess what wrong size I bought a 4150 length 9.25 not a 4160 8.21/32 should I cut it and put a hose in between for now? Dam line is the wrong size Maybe cut it for now and put hose or bend it.
Just go down to the auto parts store and get the correct line. A lot of auto parts stores have a performance section with it in stock. There are only 2 lengths for that style line, you need the shorter one.
Holley carbs use 2 different fuel line lengths, depending on if it has a metering block, or a metering PLATE (which is what your carb has). If you look between the float bowl and carb main body in the front is a 7/16ish spacer, there is no matching block on the secondary side. The jets on the secondary side are not replaceable, the metering plates have orifices that copy the function of the jets.
I think all Holley carbs originally had metering blocks. When the Mopar 6bbl (or Six Pack, depending on your Mopar “religion”) came out they couldn’t fit 3 2 barrel carbs on the manifold. The solution was to eliminate the metering blocks, allowing the carbs to fit in the limited space. Just some useless random information.
You can buy metering blocks to update the carb, I think each plate has a part number that can be cross-referenced to a specific jet size. Or, as someone suggested, get the right fuel line.
One more warning, I have no idea what 3rd world country “manufacturers” 🙄 some of those cheap fuel lines, but I think some are made from compressed tin foil. If you try to cut, bend (forget trying to flare one!) the chrome flakes off and ends up in the needle/seat, resulting in a flooded engine. I have experienced this many times.
It's not pretty, but you can bend a hump in the line in the vicinity of the electric choke housing to take up the extra space, or curve the back line towards the rear to take up some space.
As stated above, this may not be possible with cheap lines, the the better lines are soft copper & bend pretty well.
In a pinch, I've also cut & used a hose as you originally stated.
September 22nd, 2020, 07:04 PM
