Quote:
Originally Posted by DannoXYZ
This is good! So you've confirmed petcock is functional and not issue in fuel-flow.
Are you sure, 100% positively that petcock has single dedicated vacuum-hose going to left carb as shown in diagram above? No splits/Ts anywhere that may be leaking?
Another test you can do is swap vacuum-ports and use right carb's vacuum port to connect to petcock. Does that provide sufficient vacuum to open petcock?
Definitive answer is to connect actual vacuum-gauge and measure actual vacuum amount generated when cranking engine. That one number will give us clue as to what problem may be and where to look next.
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TLDR: vacuum on the carbs is effectively 0.
Video of a vacuum gauge on the left carb:
https://youtu.be/XPxPhL6qn_k
Video of a vacuum gauge on the right carb:
https://youtu.be/VUZX93R2O6Y
Alright, so I double checked my carbs, and I'm 99% sure that all of the hoses have been properly connected with the vacuum hose connecting the petcock with the left side of the carb. I'm 100% sure that the vacuum hose connecting the petcock and left carb is correct, as it is a single hose without any splits or potential areas where this might be leaking, and I've triple-checked that it's correctly plugged into both ends. The only area I haven't been able to fully see are the ones connected between the middle of the carb with the coasting enricher since I've been leaving the gas tank on.
I went out and bought a vacuum gauge to get that number; thanks for the advice! I took the hose connected to the gauge and plugged it into the left side of the carb where the vacuum hose (connecting the petcock and the carbs) is normally connected. I put the tank into reserve (don't really think this mattered, but just in case), then cranked the engine. Here is a video of my results (ps: ignore the extra tubing and inline fuel filters, I haven't had the chance to cut it down, but I know it's ridiculous at the moment):
https://youtu.be/XPxPhL6qn_k
Seeing as though I'm basically getting no vacuum, that would explain why no fuel is flowing at all (though I'm not sure how I got it to work a month ago or even just idle even though it died earlier this week; it might've provided a minimal amount of vacuum earlier on).
I also was curious to see if the results would be different on the right side of the carbs, so I plugged the vacuum gauge's hose into the vacuum port on the right side of the carb that is connected to the coaching enricher and repeated the test. I think my battery was starting to die here, but here is what happened when I cranked the engine for a few seconds:
https://youtu.be/VUZX93R2O6Y
Thoughts? Seeing no vacuum isn't too promising...
PS I'm going out of town for 1.5 weeks, so I won't be able to touch it or repeat any tests until then. I'm hoping I can order parts in the meantime and get ready for any maintenance I might have to do as soon as I get back. Really looking forward to getting back to working on this though :P