Replacing fuel hoses question

[Hlu1]

I started to have a fuel leak in the engine bay. I’m planning to replace the supply, return and the charcoal canister fuel hoses. I was wondering how many meters do I need to replace those three hoses.

https://www.fcpeuro.com/products/bmw-fuel-hose-16121180409

[venerated]

You don't need to use the Genuine BMW stuff. This is what I have used on my cars and haven't had an issue: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

You can also get it locally from places like Autozone/O'Reilly's/etc.

[roguetoaster]

OP, don't use the linked hose, it's not rated for the application which should be 120/125psi, not 50psi as posted above.

This topic was just discussed in the M42 section IIRC, so look there.

[venerated]

OP, don't use the linked hose, it's not rated for the application which should be 120/125psi, not 50psi as posted above.

This topic was just discussed in the M42 section IIRC, so look there.

M20 stock fuel pressure should stay under 50 PSI, which is the working pressure for the hose. 250 is the burst pressure, so the hose shouldn't cause issues.

My point still stands though that the OE hose doesn't need to be used. If you're concerned about the pressure or if your car has some sort of modifications that would make the fuel have a higher PSI, there's higher-rated hoses like this https://www.grainger.com/product/GAT...brItems_45VF25 still much cheaper than the OE stuff.

[roguetoaster]

M20 stock fuel pressure should stay under 50 PSI, which is the working pressure for the hose. 250 is the burst pressure, so the hose shouldn't cause issues.

My point still stands though that the OE hose doesn't need to be used. If you're concerned about the pressure or if your car has some sort of modifications that would make the fuel have a higher PSI, there's higher-rated hoses like this https://www.grainger.com/product/GAT...brItems_45VF25 still much cheaper than the OE stuff.

Good thing that there are absolutely no circumstances where fuel pressure may rise above 50psi... 250psi is also the burst pressure when absolutely brand new, and in perfect condition, so YMMV over time.

Anyway, considering the relatively small amount of fuel line required, and the potential penalty should a line rupture in the wrong place at the wrong time I would strongly suggest going with something like the grainger link, from wherever you can find it.

[e30austin]

there's a reason BMW fuel hose is $45/meter, it's some of the highest quality rubber available. i've played around with all the aftermarket stuff, the longevity simply isn't there.

[roguetoaster]

Can anyone confirm the actual markings on current BMW fuel line?

I see the following:

NBR CMD CR 03 32 08
CRP NBR/CR N18030E 7.5x3

One of those might be not actually spec'd for the application.

[e30austin]

BMW > NBR > CMD > CR > 8x13 > 32 21 (week/year)

[roguetoaster]

Okay, so NBR / CR are butadiene acrylonitrile rubber / chloroprene rubber layers and CMD is the reinforcement structure in the hose, a knit modal fiber.

So we get tree bits in our fuel lines that have an oil resistant outer and a fuel resistan inner, neat.

[digger]

there's a reason BMW fuel hose is $45/meter, it's some of the highest quality rubber available. i've played around with all the aftermarket stuff, the longevity simply isn't there.

this it is not worth "cutting material costs", been there tried that you end up replacing it sooner so cheap hose is not even cheaper

[tomstin]

I've had trouble with several types of "cheap" fuel hose with cracking over time. The only think that seems to work for me is the BMW fuel hose.

[Vincenze]

I've had trouble with several types of "cheap" fuel hose with cracking over time. The only think that seems to work for me is the BMW fuel hose.

But you have to somehow join BMW fuel hoses as they are only 1 m.
At the same time, you can order Gates Barricade and other hoses that come in 3 m, 7 m spools.

[e30austin]

But you have to somehow join BMW fuel hoses as they are only 1 m.
At the same time, you can order Gates Barricade and other hoses that come in 3 m, 7 m spools.

you are wrong. it is sold in bulk length; one can specify to not have the hoses cut and to be kept in bulk length and they can accommodate. i do this on a regular basis.

[Vincenze]

you are wrong. it is sold in bulk length; one can specify to not have the hoses cut and to be kept in bulk length and they can accommodate. i do this on a regular basis.

How can you explain this?
https://www.r3vlimited.com/board/for...2#post10059812

Just 2 weeks ago I ordered 2 meters from ECS. What arrived was 2 separate 1 meter pieces...so stupid. Call whichever business you plan to order from and make sure that they will not cut it.

OK, well getBMWParts sent me two 1 meter pieces lol. I guess OEM is no longer an option. Once again I get to eat the cost of return shipping.

[e30austin]

How can you explain this?
https://www.r3vlimited.com/board/for...2#post10059812

i don't know, i don't buy from online vendors. that being said, if you actually read what i posted, i specifically request 5m, UN CUT, from my local dealer, and i have not had an issue..........