tempest411

Hello,

I just received some new fuel lines for for the fuel pump & return back at the fuel tank end and got wondering if the current production lines met the criteria required for today's blended fuels we have in N.America? I've read lots of stories about the effects of today's fuel on the compounds used in fuel systems on older cars. Did Porsche ever take this into account when making replacements?

Just curious.

Rick

V2Rocket

I've always heard that most fuel lines for cars after 1985 were ethanol rated or at least safe for low% mixtures.

There are a number of turbo guys running E85 with just newer stock replacement hoses.

I had all my hoses rebuilt with alcohol-safe lines years back as well. And the actual hard lines should be fine.

morghen

not exactly the same thing but there were 924s like that

V2Rocket

^^wat

morghen

Porsche made some 924 that ran on Methanol
The 924 fuel lines and injectors are steel with the exception of two small pieces that can be swapped very easy for alchool friendly ones.

tempest411

The rubber hose on these assemblies looks almost cheesy, like cheap SAE 30R7 line. I was expecting something tougher, like Gates or Goodyear SAE 30R9 type hose.

944Ross

I've asked that question and never got a satisfactory answer, only that "they should be" modern materials. If they are current production, I could believe it, but I could believe there is still some old stock from the 90's around. Were the parts you bought OEM Porsche? Any dates on the bags?

Ductech

Most lines you can get at a flaps will have internal hose that is ethanol proof. But even those manufactures don't make the whole hose ethanol proof. We would run into issues with external fuel hose being used internally in fuel injected motorcycle tanks. There is so much variance in rubber fuel lines it's good to ask so many questions till at least you feel like yore making an educated decision. Even if it still isn't %100. We ended up sourcing fuel line from Chrysler that they use in the gas tanks of cars and this worked fine compared to the super spendy Ducati lines.

KevinGross

Rick, take a look at the hoses you've got. Frequently they are labeled with their certification as to fluid types.

Anecdotally, I read an article perhaps a year or so back on issues the industry was having with compliance of fuel hoses with high ethanol fuels. Oddly enough, Porsche was one of very few manufacturers who were using compatible hoses in new cars. My memory is that the Cayennes are equipped (I drive one), don't recall whether the other models were. Whether service parts for older cars are being made with updated spec hoses, dunno.

CO951

The anecdotal evidence all looks good.
There are MANY 951 guys running e85 and many of them are doing it with stock fuel hoses. I haven't heard of any problems with them.
By the mid 80's there were places with as high as 20% ethanol in standard fuel mixes. (and it was know this was going to happen years before.) It appears Porsche was on the ball.

carlege

are you really going to blame 25 year old parts on the ethanol or just that they are 25 years old? Run the ethanol and replace the parts as necessary

tempest411

I don't think anyone would blame a 25 year old hose for failure. It's the NEW hoses I was concerned about. Sometimes manufacturers will just keep on truckin' down the road with an old, outdated spec because it doesn't occur to them to do differently, or if it does, they're not interested in spending the money to change it.

944Ross

It isn't just that a hose could fail, it can shed ugly black **** into the injectors and FPR.

88Silver924S

See: http://www.gates.com/products/automo...ction-hose-mpi

Also: http://ww2.gates.com/europe/brochure...ation_id=19079

I used Gates Barricade Fuel Injection hose on my car to replace all the fuel rubber lines to and from the engine with the exception of the jumper and the tank to fuel pump which is an odd size and I bought OEM. It was fun to Dremel off the old collar with a cutting wheel and replace the hose with fuel injector hose clamps. I suspect that all modern hose has some kind of impervious chemical resistant liner like this Barricade. 2.5 bar fuel pressure is less than 40 psi, way less than the 225 psi working pressure of the hose.

For hose submerged in gas, such as inside gas tanks,
See: http://www.gates.com/products/automo...fuel-line-hose