fuel level - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 10 (permalink) Old 02-11-2014, 09:45 AM Thread Starter
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fuel level

Petcock is on off reserve. If there is no Prime position on mine how do you check the fuel level in carbs without turning the engine over?
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post #2 of 10 (permalink) Old 02-11-2014, 10:51 AM
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Place a clear 5/16" (or is it 3/16" ?) hose on the carb drain nipple. Hold unattached hose end up --hose will be looped like a J.
Open up drain nipple, open up petcock.
Observe fuel level in clear tubing....evaluate to float chamber.
{this is a answer I found from another post but thats correct}

place tube on metal drain nipple on bottom of carb run it up past your gas tank hold it and turn the petcock on look at the level beside the carb to determine the level. If there is any garbage in the carb drain it out first as well.
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post #3 of 10 (permalink) Old 02-11-2014, 11:23 AM
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I haven't, but know I could check mine running on the centerstand.
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post #4 of 10 (permalink) Old 02-11-2014, 11:24 AM
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Quote:
Originally Posted by turkeysandwich View Post
Place a clear 5/16" (or is it 3/16" ?) hose on the carb drain nipple. Hold unattached hose end up --hose will be looped like a J.
Open up drain nipple, open up petcock.
Observe fuel level in clear tubing....evaluate to float chamber.
{this is a answer I found from another post but thats correct}

place tube on metal drain nipple on bottom of carb run it up past your gas tank hold it and turn the petcock on look at the level beside the carb to determine the level. If there is any garbage in the carb drain it out first as well.
I'm not really understanding your description here. With our petcocks (those that do not have a prime position) Turning it to on will not release any fuel if it is working properly unless vacuum is applied to the small nipple on the petcock (engine cranking)

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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post #5 of 10 (permalink) Old 02-11-2014, 11:40 AM
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I would say just get everything connected and ready, and put a peice of vacuum line on the petcock nipple. pull a vacuum for a 15 secs or so, to open the petcock. after that you can release vacuum and read your other hoses.

the fuel level wont change in the bowls once they are filled, unless there is a leak, or the engine is running
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post #6 of 10 (permalink) Old 02-11-2014, 12:05 PM Thread Starter
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Ok yea I think I understand how to evaluate the actual fuel level... if the carbs would fill up with fuel lol.

But my question was how to apply vacuum,, just suck on the hose hah? Is it the center nipple coming out of the petcock pointing down,, as in the one with the smallest piece of tubing?

Last edited by GENERA1; 02-11-2014 at 12:33 PM.
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post #7 of 10 (permalink) Old 02-11-2014, 12:13 PM
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Yep you can just suck on it! Lol I haven't found a better way unless you have a large syringe or a turkey baster or something.

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post #8 of 10 (permalink) Old 02-11-2014, 12:17 PM
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When I flow tested my petcock, I used a mityvac. The petcock was open before the lowest graduation on the the gauge. Before 2" of vacuum.
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post #9 of 10 (permalink) Old 02-11-2014, 02:10 PM
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yea, it dont take much vacuum

think about, at WOT there isn't much vacuum avail to pull the petcock open to feed fuel to the bowls
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post #10 of 10 (permalink) Old 02-11-2014, 03:11 PM
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Quote:
Originally Posted by michiganteddybear View Post

think about, at WOT there isn't much vacuum avail to pull the petcock open to feed fuel to the bowls
Yeah, why I tested it. One of my first threads here-fuel starvation at prolonged WFO? Also, I have seen a small number of cruisers that have inadequate fuel delivery.
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