What is the purpose of this line?

[M1Jenkins]

Hello,

As you've figured, I'm a complete idiot when it comes to anything mechanical related, so go easy on me.

While doing my weekly oil check and changing my air filter, I noticed one of the lines (braided? wool?) had a pretty big gash in it. Can anyone tell me the purpose/importance of this line?

I've attached a few pictures.




Appreaite it.

[mhariush]

It's part of the gas tank fume vent system, it goes to the carbon canister behind the fender.

[M1Jenkins]

Originally Posted by mhariush

It's part of the gas tank fume vent system, it goes to the carbon canister behind the fender.

Thank you!

On a scale of 1-10, how important is it? Just wondering if I can continue driving the car while the part comes in or if I should just park the car for the week.

[Rasta Monsta]

Drive away. . .you're introducing unfiltered air into the intake under limited conditions, but it will likely survive.

What "part" are you waiting for? Did you order that hose from Porsche?

[M1Jenkins]

Haven't ordered anything yet, I just figured I'd be able to find that hose on 944online or this website. Haven't really dug into it yet.

[M1Jenkins]

Upon further inspection, looks like the hose leading from brake fluid reservoir needs to be replaced too.



Looks like a fun job

[OK-944]

The very same section of evap hose on my 85.5 got very thin, and smelled a bit gassy - and I plan to replace it soon. In the meantime, I've taped it up and the smell has disappeared.

Short term...OK. Long term - I would not ignore this.

[sausagehacker]

That blue hose goes from the reservoir to the clutch master cylinder, if it fails you'll get air in clutch hydraulics.

[M1Jenkins]

Originally Posted by sausagehacker

That blue hose goes from the reservoir to the clutch master cylinder, if it fails you'll get air in clutch hydraulics.

I've read up on it on Clark's garage and it doesn't look like something I should ignore. Looks like I'm rocking the 4Runner this week.

[88Silver924S]

Learn from my mistake: the hose nipple on the clutch master cylinder is breakable plastic not steel. I assumed it was steel. I found out because the hose was "stuck" on the master cylinder hose nipple and I was pulling and twisting to free it, the nipple cracked and broke. Luckily I had a spare from an old master cylinder in my bone pile. If yours is stuck, I suggest a razor and carefully slit the hose 85-95% through careful not to nick the barb and use a small screwdriver to work it off without breaking the plastic.

Also brake hose may not be the same rubber compound as fuel hose, radiator hose, etc. Get brake hose so that it does not get chemically attacked by the brake fluid.

Good Luck and have fun.

[M1Jenkins]

Thanks for the tip.

Now, after taking a close look that blue hose, how the hell does it even come off? The entire thing is basically blocked with fuel rails and vacuum hoses.

Also, when I remove the blue hose going from the brake reservoir, won't there be air in the lines? Is there anyway to prevent that or is bleeding the breaks inevitable.

[sausagehacker]

Originally Posted by M1Jenkins

I've read up on it on Clark's garage and it doesn't look like something I should ignore. Looks like I'm rocking the 4Runner this week.

Another 4Runner/944 combo owner? Aww yiss My DD is a '99 limited.

With respect to that line, bleeding it after replacement can be the most challenging part. There are different ways to do it, some people have really had a hard time. But luckily there are DIY guides out there. For me, it worked best when I squirted in fluid via the slave bleeder with a simple oil squirt can and let gravity move the air bubbles to the top (reservoir).

[pfarah]

If I may humbly suggest purchasing the Motive Brake Bleeder unit. Once my car was on jack stands and the wheels off, it took about 20 minutes (performing a bleed operation for the first time) to flush out the entire system, including all four corners as well as the clutch. Since the brake fluid was quite dirty, I ran almost three bottles through the lines. If you enjoy working on these cars, I admit the process was actually fun, especially knowing that it was done right and I saved over $300.00 the local P-dealership charges for this job. Good luck!

[peteb]

Hi,

I have replace the blue clutch hose and have not needed to bleed the clutch. Just fill the hose slowly and give it a few taps. The air has a clear path up to escape and it does not need to be forced out.

If you had a leak that let air in the system, then you need to pressure bleed.

When shopping for a new blue hose, go for the genuine Porsche part (available from our host). It is a better fit than the aftermarket hoses that have a slightly too small ID.

I would not let the crack in the vent line go to long. It is a source of unfiltered air. Maybe just plug it until you have time to fix it.

Peter