Fuel Hose Routing Question
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Elder User
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From: Boston, KY
Fuel Hose Routing Question
Is there any reason I shouldn't use some 90* elbows when routing my rubber fuel hose? I want to keep things tidy and keep the line as short as possible. Since rubber hose has a large bend radius, I was thinking some 90* brass fittings would do the trick. Anybody think it's a bad idea?? I am not sure I've seen it before, and want to make sure there isn't some reason like flow restriction.
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
Well certainly it's going to restrict flow more than if you just run the hose around the corner. You've got a 460 there with, I am assuming, a 4V carb, so demand is fairly high at WOT. Depends on how big of a fuel line you are running, I guess.
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Elder User
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From: Boston, KY
So you would advise against elbows in a 3/8" rubber setup? The truck already hesitates at WOT, likely due to a 600 CFM carb that needs to be fine tuned. I know there is a lot of discussion out there on pressure vs. flow, and I can see how decreasing square inches of the hose profile keeps the same pressure with lower flow...I was hoping to hear it doesn't matter because I want to tidy up the hood, but I guess I'll plan on using straight hose, aside from the return that exits at a 90* angle from the fuel flow. Maybe the solution is a number of clamps attached to the firewall to bend the hose as best as I can to keep the radius down.
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Elder User
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From: Boston, KY
...ok, just did a bit of research - a 3/8" NPT elbow is 3/8" inner diameter, which is the same as the fuel hose. So, since there are no restrictions in diameter, would it still restrict flow??
Lead Driver
Joined: Feb 2002
Posts: 7,970
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From: Greater Austin, Texas
You still have a restriction in that the fuel has to transition to the elbow and also make the sharp turn. It's probably not enough of a problem to even measure, so maybe the answer is, in actual practice, no. However, I am having a hard time visualizing where you have this mass of fuel line that needs taming.
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