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Captain Obvious

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Captain Obvious last won the day on August 3

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About Captain Obvious

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    Philadelphia, PA

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My Z Cars

  • Zcars Owned
    Former Owner
    Z fanatic but no car right now
  1. 4bbl 280z swap fuel pump issues.

    I don't think there's any way you would ever be able to consume 35 GPH. I don't think fuel pump capacity is the problem. Note that I'm not ruling out fuel starvation, but if there is starvation, I don't think it's because the pump is only rated for 35 GPH.
  2. 1974 Datsun 260z won't start

    Haha!!
  3. 1974 Datsun 260z won't start

    No, that's not a good sign. I just want to tell you both good luck. We're all counting on you.
  4. Thinking about installing an BMW M6 engine in my Z

    Yeah, I'm hoping for some interesting forensic discovery... I'm just hoping it's not too gruesome. Any possibility that you starved something for lube with the oil pan changes you made?
  5. JNC Happy Eclipse Day from JNC

    Wow! Me too:
  6. 1974 Datsun 260z won't start

    Oh. Nevermind. I was confused by semantics and picturing you taking measurements somewhere else. (I'm a dirty skunk? I'm a dirty skunk?) Seems really odd that it would be both of those W/R wires though, doesn't it? Both ends disconnected, and they both still measure hard to ground?
  7. 1974 Datsun 260z won't start

    Well I know you know this, but don't get hung up too much on "continuity to ground". Some things will appear to be shorted to ground, but are working as they should be. Like the headlights... If you are measuring continuity to ground through the headlight wire, it's not a problem. It's supposed to do that, and unless you have a good meter, you won't be able to tell the difference between a cold filament and a dead short.
  8. Starting problem

    My 77 had the carbon can removed before I got it, so I can't look for any of that restriction. Which tube is it in? 1) The tube that leads from the tank to the can 2) The tube that leads from the can to the intake manifold 3) The control line tube to the throttle body and distributor I believe my old 260 had a restriction between the can and the intake manifold.
  9. Starting problem

    I'm thinking the check valve on the CARB system is a smaller check valve with a lower cracking pressure than the one on the gas cap. But since the CARB system is under vacuum when the engine is running, they can't use that smaller check valve when driving. They still need the other one on the gas cap to break any potential vacuum in the tank as fuel is removed to run the engine. Again, just reverse engineering speculation.
  10. 1974 Datsun 260z won't start

    Oh, and BTW, I think there are three W/R at C-5. One to the ignition switch, one to the headlights, and one to the ammeter. I hate the 260 wiring diagram...
  11. Starting problem

    Not sure, but my guess would be that they didn't want the system to continuously circulate. Think about this scenario... Car is sitting overnight with a half tank of gas and everything is cold. Then in the hot Arizona sun, the car heats up to 140 degrees at mid-afternoon and the vapor in the gas tank expands and cracks the check valve and pushes some vapor up into the carbon can. Then that night after the sun goes down, the car cools off to 60 degrees at 2:00AM and the vapor in the tank contracts and draws a vacuum on the tank. If the only way to reduce the vacuum is through the gas cap, then it will essentially form a one way path. Every day it will push into the carbon can, and every night it will suck in past the gas cap. Eventually, your tank will be empty, and your carbon can will be saturated. I wasn't there when they designed it, but my theory is that they didn't want that to happen. So they put in another way for air to get back into the tank to reduce that vacuum, and by pulling it back through the carbon can, they can put those vapors back into the tank where they belong. Essentially exhale and inhale through the same tube instead of inhaling through one and exhaling through a different one. Haha!! Far fetched maybe, but that's all I got?
  12. 1974 Datsun 260z won't start

    What he said.
  13. Thinking about installing an BMW M6 engine in my Z

    Wow. That really stinks! Here's to hoping it wasn't really something that serious.
  14. Steering Rack Disassembly and Refurb

    Patcon, is there something specific I should repost? I do still have all the pics local.
  15. Starting problem

    That little black gizmo is what they call the check valve, and it's not as simple as it looks. In one direction, it is supposed to pass vapor easily, and in the other direction, it is supposed to pass vapors as well, just not as easily. Here's a couple snippets from the FSM showing the details: Here's where it is on the car (Number 8): Here's where it is on the evap system schematic (number 17): And here's how you are supposed to test it. Note that they didn't include this little tidbit until the 78 version of the FSM. In the EC (Emissions Control) section:
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