High pressure fuel lines for fuel feed and return?

[jaredmac11]

I replaced all the hoses under the intake including the two fuel hoses that are used to connect the metal fuel lines to the fuel rail. The 1-3" hoses. I went to the auto parts store and got fuel grade hose but im not 100% sure its HIGH PRESSURE fuel hose. Is this critical?

Should I tear off the intake manifold and replace, or will standard fuel hoses work?

Hoping someone can chime in and say they used the standard fuel hoses for a few years and no car fires..yet...

[roguetoaster]

I have never used standard pressure lines in the engine bay, but in a pinch I used some at the fuel filter and forgot about it for a couple of years until I noticed MPGs going way down/a slight fuel smell. It turned out to be leaking out of a pin hole or three, and the condition of the tubing was horrible.

Never again.

[e30sh]

You can use the cheap stuff on the low pressure return side or in a pinch but I'd do what roguetoaster said, buy the good stuff. It's all 8x13 and ~$10 a meter.

[jaredmac11]

Sounds good. Looks like I'm taking off the intake again...

Do you have to replace paper gaskets after you torque em down ? I haven't cranked the engine yet and this is a full rebuild, all new everything

[roguetoaster]

The intake gaskets can typically be reused.

[george graves]

It would be great if someone could suggest an aftermarket hose that isn't ungodly expensive??? Cause I usually just get it from the dealer.

But I agree - don't use the autozone/pepboys/kragen stuff, even if it's marked as high pressure lines.

[digger]

should be able to change fuel lines without removing intake id think

[Andre3127]

5/16" ID fuel hose also works. I just replaced my rubber lines two days ago. That hose under the booster is a real pain to loosen.

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[jaredmac11]

should be able to change fuel lines without removing intake id think

These are the tiny little lines that go from the fuel rail to the metal fuel lines. I'll take a look but I thought its pretty tight.

5/16" ID fuel hose also works. I just replaced my rubber lines two days ago. That hose under the booster is a real pain to loosen.

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Yea 5/16" is what I got. It comes out to be 7.9mm so its just a slightly snugger fit, which is better than being larger.

[jaredmac11]

Has anyone used neoprene or nylon fuel lines? I feel like back in the 90s there was less ethanol in gas so maybe rubber isnt the best go-to anymore?

[e30sh]

It would be great if someone could suggest an aftermarket hose that isn't ungodly expensive??? Cause I usually just get it from the dealer.

But I agree - don't use the autozone/pepboys/kragen stuff, even if it's marked as high pressure lines.

I've always used CRP / Rein now. I get it from my local German repair shop He's always charged me $10/meter. ECS is $8.89 / meter if you are not in a hurry. BMW is now $32.

[jaredmac11]

I've always used CRP / Rein now. I get it from my local German repair shop He's always charged me $10/meter. ECS is $8.89 / meter if you are not in a hurry. BMW is now $32.

Agreed.
Im going to get some 225 psi from NAPA. Should be good for the first crank.

CRP is the OE provider for Continental, which should be your go to for anything rubber.

You dont have to go BMW.

[reelizmpro]

I just replaced 5 year old (5k miles) CRP lines on my turbo M20 after a rupture. The supply hose was cracking and was spewing fuel after start up. Thank goodness it didn't happen while driving. I'm sure the heat from the turbo didn't help but very surprised they only lasted a short time. I replaced both lines with 5/16" Gates Barricade high pressure EFI hose.

[roguetoaster]

My recollection is that one component of the CRP line as originally fitted to E30s was changed perhaps 10 years ago to meet some type of eco friendly spec, and I'd bet that the change to less toxic barrier reinforcement has led directly to early failures. There's also a temp spec listed if you look up the codes on the CRP line, and I'd bet it's not turbo friendly.

Can also second having gone to Gates Barricade, but there do appear to be lots of fake Gates fuel hoses out there, so be cautious.

[reelizmpro]

Knock off fuel hoses? oh wow, that's crazy and very dangerous.