Need help with my fuel lines

I think that’s right. But I couldn’t recreate the second flare so I had to rely on the first flare that I made to help hold the hose on.


What you need to do is either tow the car to a shop and have them replace the line, repair what’s broken, or fabricate an entirely new line

Or you buy a kit similar to the one I pictured and do it yourself

Please tell us what year your Corolla is

Rotted out fuel and brake lines are a way of life around here. Even on fuel injected cars I have always just used steel line of approximate size and length and joined them to good existing line or fittings with short lengths of high pressure neoprene hose and doubled high pressure clamps. Never has one leak or come apart. Have they significantly raised the pressure in fuel injection systems in the last 20 years? I know NY has laws about the length of flexible lines you can have in your fuel lines but I have never had trouble passing inspection.

The copper nickel hand bendable brake lines have been used in Europe for many years and are required in some countries.

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I would say yes

Gasoline direct injection is quite common nowadays

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Fuel pressure from tank to engine is generally 50 to 70 psi.

Direct fuel injection plumbing is stainless steel or plated, can’t allow corrosion when dealing with pressures up to 20,000 psi.


The car in question is a Corolla old enough to have the fuel line rot out. I doubt it is a direct injection. The last high pressure fuel line and were rated at 175 psi and I doubled up om the clamps…

I do not think this Corolla has direct injection. Just because I am too damn curious. What automotive direct injection system uses 20,000 psi ? My understanding is most automotive GDI systems work on 1500-4500 psi. On a diesel 20,000+ psi, yes and that would be from the injector pump, not from the lift pump in the tank, on a Corolla no. IIRC a fuel injected Corolla should have around 50 psi at idle.

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I replied to a persons question about fuel pressure and this is the answer;

oldtimer will not need to patch or repair rusty high pressure fuel systems because they are stainless steel or plated.

Got it, guess I read it too quickly.

If I had that problem I’d either

  • buy a new metal fuel line from a parts store or dealership
  • buy a used line from a car-parts recycling business (pick n pull etc)
  • ask around to find a shop that would make it for me. Ask auto parts stores, auto repair shops, look in yellow pages under metal-work shops, which the best place in town is for that sort of work. You don’t have to re-invent the wheel. Remember auto repair shops face this sort of problem all the time, and so they must have ways to solve it, either in-house or asking another business to do it for them.

True enough the copper/nickel alloy tubing is used for brakes, but before using it, check to make sure it is compatible w/fuel systems. You don’t want it to flake off and bits of metal grit clog the carb or fuel injectors.

You’re overthinking this

Just have a shop fabricate a new line . . . or repair it using that kit I pictured

This isn’t that complicated

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The OP stated he was going to order a new fuel line, they are less than $75.

If you’re worried that a replacement OEM brake line with a factory coating is going to rust out during the life of the vehicle, you must plan to keep the car on the road for a very long time! If this is the case, then something must be done to protect the rest of the car from rusting else it will start to fall apart while the brake and fuel lines are still good!