Fuel line size
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Fuel line size
After doing a thorough inspection of my fuel system, my lines are no better looking than my tank... they do work fine, but there are some 1/4" sections scattered [ghetto rigged garbage??? not sure], and I am quite sure a fuel starvation problem is occuring. But I have a 400 motor, even tho it is a 2bbl, which is above stock probably... it's a mech fuel pump, and the fuel pump has 3/8" lines, and the tank sending unit [not a pump] is 3/8" but I know making the fuel lines 7/16 would be real easy... or 1/2" maybe? I really have no Idea. I want to feed my dead head 2bbl with plenty of fuel, what size line should I use? And if I just bypass all the stock lines [not necessarily removing them, but not using them], would this be an issue in any way? my fuel gauge does not work, and that's fine, and the side tank is garbage and i don't want it, and thats it.
Post Fiend
Joined: Oct 2003
Posts: 9,176
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From: Western Central NV
I suggest this to anyone fixing or replacing fuel line hose. 3/8 for fuel to carb. If you have a return line 5/16 is good. I suggest you buy power steering hose, or hyd hose, instead of gas hose. The reason is the gas hose today is JUNK, IMO. I have been running HYD.HOSE for several years. It holds up much better. It is a little more money but I find in the long run it is much cheaper. I don't know about you but changing gas hose out isn't one of my favor things. Most Napa or CarQuest stores have 3/8 & 5/16 power steering hose.
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Alright, 3/8" it is.... one more question, what are the differences in 3/8 line and 3/8 hose... i know both will work, and the hose would probably turn out easier to route, but could I run into some problems with that as well? Obviously both I would securely attach to the frame, so i'm not sure a difference is there... except in price, not sure which is cheaper line or hose..
Post Fiend
Joined: Oct 2003
Posts: 9,176
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From: Western Central NV
I call rubber hose fuel line sometimes. I guess line would be the metal or plastic that is used by the factory. If your going to mount long runs like down the frame. I would suggest buying metal then clamping that to the frame. You can buy steel brake line that would work great. Along with a tubing bender. Personally I wouldn't use HOSE for anymore than a few feet. Like from the fuel pump to carb. 6" or so from the tank to the frame. The rest to do it right IMO should be metal.
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Alright, I see what you mean. Hose 'll connect the tank to the line on the frame, line on the frame up to the line on the MFP, which is an actual line so I can just replace it all the way up to the fp. It'll be perfect.
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From: Virginia
Yes, try to run metal line as much as possible. It's much less maintenance. You can go to the auto store and get universal lengths of brake line and the larger fuel line. This works best to route the line around obstacles and crossmembers along the frame. You can get couplers to mate the ends which are already flared. It will probably take 2 or 3 pieces to get up front.
I would also run a steel line from the fuel pump to the carb, stopping short to run a good large aftermarket fuel filter. You can use a short piece of hose at the gas tank, and another at the filter up front.
I would also run a steel line from the fuel pump to the carb, stopping short to run a good large aftermarket fuel filter. You can use a short piece of hose at the gas tank, and another at the filter up front.
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Okay, sounds straightforward enough... and I've done a few brake lines, so I know lines.. and I know how "fun" they can be 
. Actually the lines to the carb are all good.... hard line all the way up with a short hose connecting it to the carb with a fuel filter on the carb. Just gotta get the tank hooked up good to the FP. I am also going to totally bypass the gas tank switcher, and all the old lines totally... should make a huge difference.
. Actually the lines to the carb are all good.... hard line all the way up with a short hose connecting it to the carb with a fuel filter on the carb. Just gotta get the tank hooked up good to the FP. I am also going to totally bypass the gas tank switcher, and all the old lines totally... should make a huge difference.
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