87 2.5, Isuzu, with A/C. Like the title says, I have some corroded hard lines i need help identifying that run horizontally along my firewall, under the C500 block. I'm pretty sure they're not the fuel lines as i can see those knuckling down under the battery tray toward their destination. I think my borrowed "vented" battery is to blame, as i originally had a sealed battery there. Any help is greatly appreciated. I would post pictures, but I'm at work right now.

The lines are to and from the fuel system expansion tank, located outboard of the battery.

quote Originally posted by blacknblue: 87 2.5, Isuzu, with A/C. Like the title says, I have some corroded hard lines i need help identifying that run horizontally along my firewall, under the C500 block. I'm pretty sure they're not the fuel lines as i can see those knuckling down under the battery tray toward their destination.

~1/2 inch? Heater output line.
Goes to intake manifold.
See my Cave, Heater

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)