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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 12-28-2010   #1 (permalink)
bill scott is offline Apprentice


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Default help , what is the best way to run my fuel line

hi and happy new year... i am putting in 1 line from the gas tank to the fuel pump on a 66 fast back. i need to know what is the best way to start this and end up at the fuel pump. i am told it is very hard to do. thanks as always for your help(just cant beleave today it is so great to get input from others so fast, new world ) sorry i got the pre bent from mustang unlit. thanks
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Unread 12-28-2010   #2 (permalink)
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I honestly would use a factory line. Its much easier and you do not have to bend lines. If you use a roll of line, I would try to follow the original path. It is up and out of the way. A good bender and time will accomplish the latter.

Good luck.
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Unread 12-28-2010   #3 (permalink)
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Hi Bill

First off, the job is not that difficult. However, it can get frustrating because of the length and bends of the fuel line. Just be patient and you can get this done. I installed the pre-bent lines in my 65FB and actually found most of the bends to be accurate. It installed with a minimum of bending and tweaking.

The fuel line is usually bent once in the middle for packaging. Slowly and carefully straighten the fuel line at this bend. Put the fuel line on the ground so you can figure out which end goes to the tank and which end to the pump. If you can't decide, don't worry. You can compare it to your old fuel line or we'll measure the distance to the first bend so you can be sure.

First disconnect the negative battery terminal. Now jack up the car to a distance high enough so you can work under it and safely put it on 4 jack stands. Remove the left front and left rear tire. Now remove the nuts and u-bolts (1st pic) from your drive shaft letting it swing down. Then push it to the right side of the car so it's out of your way. Leave the other end connected to the transmission. Most of your fuel line runs down the side of the tunnel (2nd pic) parallel with your brake lines. With the drive shaft somewhat to the side, it will give you room to work.

Remove Old Fuel Line: Before beginning, have some old rags handy because you're probably going to spill some gas. Also get some bolts or something you can use to plug the fuel lines at the gas tank and at the fuel pump. Disconnect the clamp that holds the small rubber fuel line at the tank (3rd pic). Disconnect the fuel line and plug the rubber hose so that it doesn't leak. Now go the the fuel pump and disconnect the rubber fuel line from the steel fuel line (4th pic). Plug the rubber hose at the fuel pump. Drain the fuel that's left in the fuel line into a suitable container. There's more fuel in that line then you think. Now start at one end of the fuel line and follow it to the other, disconnecting or undoing any clamps that you come across (5th pic). There should be at least 2 clamps in the tunnel that hold your fuel line and brake lines. There should also be at least 2 on your front frame rail and one in the back near the tank. Once you get all the clamps and the fuel line is free, begin at the front by the fuel pump and pull the line through the hole in the apron. Now the fun part is getting the line over the rear end, and around your exhaust (6,7,8th pic) (Note: I had to disconnect the bottom of the left rear shock absorber so it hung free and I could get the fuel line around it. You may or may not need to to that.) Keep twisting and jiggling the line until you can get it to come free. Then slide it out from under the car. Now compare the old line to the new one and you should be able to figure out which goes to the tank and which end to the pump.

Install The New Line: Push the new line from the front to the back of the car. You have to start with the rear by the tank. Make sure the line goes over the rear end and then start wiggling it into place. If you have to make some minor bends as you go, that's OK. Once in place, go back to the front and push the new fuel line through the grommet in the apron(9th pic). Now go back and start to fasten the clamps. Once you get it buttoned up and it's to your liking, re-install the drive shaft, left rear shock and tires. Double check your connections at the fuel tank and the fuel pump.

Start your car. It may stall a couple of times because of the large gap of "no fuel" in the the new line. Once started, check for leaks. If we have totally confused you, say so and we'll help. Let us know how it goes.
Good Luck.
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Unread 12-29-2010   #4 (permalink)
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hey 65 fix up... man you are alsom in the way you set this out, i have ran a copy of the intr. out and it will be much better than i thought. thanks for your help and i will let u know how it worked for be, thanks again for your inderstanding of a none macannot. bill scott
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