Fuel line routing opinions

[jomatt20]

Hi guys, I relocated my tank to the rear and finally got around to running my fuel lines. I ran 3/8 aluminum line and 5/16 for my return line. I bundled them together using 5/8 insulated clamps. Looking for your guys opinions on how they look and if you see any issue with how they are ran. Thanks! Your pics are welcome!

[jomatt20]

2nd pic

[jomatt20]

3rd, dunno why there posting upside down

[leftybass209]

The routing looks fine. The only potential issue is if they chaff touching each other like that. On OE gm vehicles dual lines are usually clamped separated from each other. I'm not saying it is an issue, just something to consider.

[SS Tim]

It is considered best practice to clamp the lines singly. The idea of a padded clap is to prevent abrasion of the line which you are negating by clamping them loosely together. Any relative motion is abrading the lines at contact points.

You would do well to take a look at the factory servixe manuals for routing, fill and vent practices on Blazers and Suburbans. Having factory rear tanks they are very good models to pattern from.

RTFM ... Read The Factory Manuals... download 'em here

[Fatherflash]

As others have mentioned, your lines will chafe against each other at each clamp location. Separate each line from each other and you should have no problems. Each clamp should hold one line. 5/8" is too large for your lines. Add another clamp at each location 180 degrees off center of clamped line. For third line, stagger the clamp further down the line. If you need good clamps look at aircraft supply places like aircraft spruce or mcmaster-carr.

The lines immediately forward of the fuel tank: spread them apart if possible (third photo). There appears to be a point where clamp on one line is rubbing or may rub on the other line.

If possible, please place a clamp on the line where it appears you have placed a pinch in between two lines (Brass fitting in photo one). Believe it or not, this weighs more than the surrounding line and may fail, cause leaks, vapor problems. You may not think it is not a big deal however, when you get into weight concerns vs. fluid dynamics and harmonics/frequencies, this may be a problem in the future.

Also ensure each clamp is snug but not tight. Ensure the clamp does not pinch the line but retains the line in its location. You are looking to retain the line, not restrain the line. Hope that makes sense.

I hope I do not come across as blasting you. You have done some great work and I just want to ensure you do not have problems in the future.

[jomatt20]

Thanks guys they are clamped tightly together. Should I still be worried?

[rocknss]

I would separate the lines! On my Burb the fuel and brake lines are on there own clip!

[72.4me]

Fixed

[Bigdav160]

Originally Posted by rocknss

I would separate the lines! On my Burb the fuel and brake lines are on there own clip!

They are not that way from the factory. I just removed that whole bundle. The retainer clamps are different and keep the lines in a row flush against the frame.

Perhaps steels lines are more forgiving. And yes, I've seen many aluminum A/C lines rubbed through.

edit, if your saying the brakes are in one clamp and fuel/vapor in another you could be correct. I didn't remove the brake lines. I thought the brake lines were down the drivers side and fuel/vapor down the passenger (Suburban)

[In The Ten Ring]

I went back as close to original fuel lines as I could. Mine had vent, brake, and fuel lines stacked on top of each other until each split off. 1 clamp held all three but on top of each other, not overlapping.

I also used the original brake and vent lines and only replaced the fuel line with Poly Armor which is a steel line. I haven't started the truck up yet so there is that.

[jomatt20]

I think I'm going to just start over, would any of you guys have pics of the fuel routing? I have a vent line going to the filler, should I run 0ne more?

[rocknss]

On my 69 Suburban the fuel and brake lines run on the passenger side separate from each other.

[tonkatrux2]

Just another idea I used plastic line for all my fuel line. It was fast and easy looks great. I bought a kit that has lines, fitting everything you need but fuel filter. Kp1200 kit by sur&r