Fuel line questions tii

[NMDerek]

so many options to replace fuel lines on my 74 tii, but how much 7 feet? and what size do I need? I probably go braided, autohouse? is there a return fuel line? length.

seems like our vendors dont have much or hard to find.

first time doing this...

tia NMDerek

[Rodolfo Lasparri]

Hi Derek, 

 

For the main body line I used this Copper/Nickel line. It was easy to bend by hand with care and route as needed. Outside of this, you just need some smaller rubber line at each end for the pump and up from the firewall. I used some small pieces of cut rubber hose to insulate/protect it at each of the mounting points as well.

 

https://www.amazon.com/gp/product/B07BN3DL5B/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

Edited February 6 by Rodolfo Lasparri
typo

[2002iii]

I'm no tii expert but I believe it's 8mm or 5/16. You should be able to get that at your local parts store.

 

Part # from realoem.com: 16121115965

Edited February 6 by 2002iii

[Son of Marty]

The return line is the clear-ish plastic line that runs through the car same as all 02's the caarb cars use it as the supply line, the pressure line is made up of a rubber hose to the fuel pump and then a steel line ( no part number given )to the front left corner of the engine bay, RealOEM will have the part numbers for the parts still available. Make sure that the fuel hose you use is rated for F/I and is for use with ethanol. 

Edited February 6 by Son of Marty

[ColinK]

56 minutes ago, Son of Marty said:

RealOEM will have the part numbers for the parts still available. Make sure that the fuel hose you use is rated for F/I and is for use with ethanol. 

The 8x13 (16121180409) BMW fuel hose (from Blunt, other vendors or the dealer) is rated for higher pressures than 'normal' fuel hoses. 

Last time i purchased from a dealer is was in a one meter length and it handled all the connections. Good time to replace the fuel filter by the radiator also and check the mesh filter on the bottom of the tank pick up. 

[Stevenc22]

your car should already have a metal fuel line running along the drive side frame rail. That is the supply line. A plastic line runs through the interior of the car and that is the return line. You use 8mm ID fuel hose for the engine side fuel connections. There is a special 12mm id rubber hose that goes from the tank to the fuel pump 

[fjord-tii]

Just be sure there is a flare (bubble?) near the end of the metal tubing where the hoses attach to eliminate possibility the hose can slip off or leak, or use a compression fitting hose connection.

[chargin]

Note: If you replace the rubber line locally be sure and buy "Fuel Injected" rubber fuel line, it will work fine but costs 3X as much as regular fuel line.

Personally I replaced both hardlines and it virtually wiped out the "Fuel Smell" my wife always complained about 

 

 

 

 

[JAS]

If you replace the hard line from front to back, put a flare, preferably a bubble flare at each end so it is like the original line. A little extra assurance the attached rubber fuel lines don't pop off if, for whatever reason, the hose clamps don't do their job. 🙂

 

While I managed to replicate the shape (bends, curves, etc.) of the original fuel lines pretty much, there were a couple of points where the new line rubbed against the body so made sure I used some old fuel hose as a barrier in those spots.

[Son of Marty]

On 2/6/2024 at 2:30 PM, Stevenc22 said:

There is a special 12mm id rubber hose that goes from the tank to the fuel pump 

This, or you'll play merry hell trying to get a SAE sized hose through the hole in the trunk.

[DanVT]

What! Wait! There’s supposed to be a flare on each end of a tii steel fuel line? My original didn’t have them, unless they were cut off by previous owner.

DanVT

[Rodolfo Lasparri]

Nope, there were not flared ends on an original Tii hard fuel line; contrary to noted above. My original 73 did not have it either.

[dlacey]

Here's another data point.. original steel fuel line on a '73 tii

 

Crusty and flared 🙂

[DanVT]

So has anyone actually had a properly installed tii fuel line blow off with non-flared ends?
Dan

[tzei]

Fuel hose over plastic pipe, 2x ABA gas hose clamps. No failures.