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  1. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    In my learning of the system, the charcoal canister can't do much to help. It has limited ability to absorb fuel vapors, and the primary job is to handle vapors when parked. When the engine is running the engine generally ingests the fuel vapors and recharges the canister via the purge valve...
  2. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    It's a pretty typical impeller type fuel pump running at ~42 psi. There's a multi-step fuel controller so the flow rate is somewhat variable. Here's a teardown: https://forum.ih8mud.com/threads/p0171-system-too-lean-fuel-trim.1289672/post-14555977
  3. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    Memory is a bit fuzzy but I think you're right that the return line did dump into the bucket. There seems to be a jet pump that further siphoned into the bucket. International setups with a aux tank have yet still another jet pump to siphon from the remote tank. Here's a pic and all lines...
  4. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I believe that circuit is the power steering cooler.
  5. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    If you're serious about solving the fuel boiling issue - use the below as a template for the solution. What's common is that cruisers mount everything high and tight in the chassis increasing the degree of heat soak. Chassis skids further exacerbate the issue.
  6. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I just added them to my dashboard. And will take a look at my next drive. Though I'm in near freezing temps in Wyoming at the moment. I'm not sure monitoring these will be all that useful. Perhaps to compare diff fuels in more controlled conditions? As it is, vapor pressure is a quality...
  7. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I've experienced this is big bear too. It's important not to open the gas cap. The pressure the system builds helps manage vapor pressure. By opening the gas cap, pressure suddenly drops to atmospheric, which will cause the fuel to boil more vigorously. Other things that can be done - use...
  8. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I have no doubt that fuel temperature is directly correlated to fuel vapors. I tend to want to just jump to solutions, but you've guys got me thinking that data would still be useful. If only to characterize the effectiveness of various solutions. Another science project? I think something...
  9. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    We know fuel vapor issues aren't unique to the 200-series. It's possibly exacerbated by the design parameters, that has their bits tucked up higher than the frame rail and tight together. Most every other body on frame architecture I see usually has bits hanging lower, including the taco and...
  10. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    Was playing in the mountains this past weekend and experienced some fuel vapors. It was distinctly coming from the EVAP vent and not the fuel fill. It would be hard to distinguish in a stock setup as the vent is at the cap, but in an LRA setup, the vent is behind the wheel well and it was...
  11. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    Some insight, I recently idled the truck while monitoring variables on a mild 80*F day. Intake air temp would start 5-10 degrees above ambient. After 15 minutes, was at 150*F. That's at the fender outside of the engine bay. Inside the engine would be that much hotter.
  12. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I agree that it's worthwhile to troubleshoot basics first. We know there's multiple potential contributors. Each adding to overall heat input to the fuel system, potentially pushing it over the point of too much vapor pressure for the system to handle. Surely this would be a variable to rule...
  13. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    Since I'll be playing with the fuel tank this weekend, might do some preventative heat mitigation efforts.
  14. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    From a systems design perspective, a returnless fuel system is generally a lower end architecture. Toyota does use them in lower end models. They have their own cons. In regards to heat, is not a solution, because in low speed crawling conditions, the fuel sitting longer in the rail waiting...
  15. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    There's many facets to this and from others inputs, it can happen to stock cars just the same. That doesn't mean there aren't factors that can further contribute and I do believe under armor is one of those. There's a difference between temperature and heat. Particularly in regards to heat...
  16. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    It'd be interesting to know what type of bumper and under armor mods you have. And whether you were in low range range in this test? A vender here was developing and testing their skids. First trip out and they got the gas to boil. Took off the skids and issue improved.
  17. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I believe these coolers are all tied to A/C circuits. I'd be concerned a passive cooler on the cruiser may run the risk of picking up more heat in crawling conditions, unless routed away from the undercarriage.
  18. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    For those that have OBD monitors, and maybe a dashboard via OBD Fusion, it maybe interesting to monitor a few parameters. - Intake Air Temp (IAT) - Evap System Vapor Pressure - Long Term fuel trim Bank1 and/or Bank2
  19. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    Yup and yup. Many contributors here. I wasn't suggesting to use low range if driving conditions allow higher speeds than low range will do. At the same time, low range is useful for more than just crawling.
  20. TeCKis300

    Gas/Fuel vapors/fumes visible from gas door

    I get a ton of dirt and dust on my LRA breather as well. It's become a maintenance item and I can definitely tell when it gets gunked up enough to affect fill speed in normal conditions. I'd imagine filling under fuel boiling conditions to be that much worse, to impossible, as the vent is key...
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