Today, having a little time on my hands, I though I would take this to a full conclusion, this is what we did, Richard, Londonboards came round and gave a hand. He says he'd not read this thread.
Anyway on to the experiment.
I dug out an old GS1000 fuel tank because it would be the biggest one I had.
I topped it to the brim with fuel and it took a gnats over 19 litres, that was 42 pounds.
This is the set up with a pressure gauge at the bike end and at about the standard level. The gauge was 0 - 15 psi (2 bar) (because it was the smallest reading one I could get) But for this it was good enough.
The bike started and ran normally and the gauge was at zero which I was surprised at because I did expect it to at least register something because it had forty + pounds above it.
Here we raised the tank about four feet above normal, actually way more than we would use in a working workshop environment but anyway did it anyway, no leaks, no strange running just idled and revved fine. Actually the gauge is about five vertical feet below the bottom of the fuel tank, a foot lower than the carbs
The bike started, idled, and revved normally, no leaks.
So really this is the place I should have stopped as it proves what I contend that in this case its of no significant difference to us in this case.
But of course I didn't.. We stuck a wheelie bin on top of my shed roof and perched the still full tank on top of that which put it at fifteen feet from the floor, thirteen feet above the carbs,
This is what the gauge said. About 1.5 psi. The bike started, idled and revved normally no leaks. I did have a problem wit a sticky float valve early on in the experiment on carb no 3 but that was cleared up by tapping the offending bowl with a hammer after that no leaks whatsoever. I have not touched the bike since middle November last year.
I hope this helps clear this up.
The only thing that I wish I'd'v done was drain off ten or fifteen litres and seen what the gauge said but I didn't think of it at the time.
Anyway on to the experiment.
I dug out an old GS1000 fuel tank because it would be the biggest one I had.
I topped it to the brim with fuel and it took a gnats over 19 litres, that was 42 pounds.
This is the set up with a pressure gauge at the bike end and at about the standard level. The gauge was 0 - 15 psi (2 bar) (because it was the smallest reading one I could get) But for this it was good enough.
The bike started and ran normally and the gauge was at zero which I was surprised at because I did expect it to at least register something because it had forty + pounds above it.
Here we raised the tank about four feet above normal, actually way more than we would use in a working workshop environment but anyway did it anyway, no leaks, no strange running just idled and revved fine. Actually the gauge is about five vertical feet below the bottom of the fuel tank, a foot lower than the carbs
The bike started, idled, and revved normally, no leaks.
So really this is the place I should have stopped as it proves what I contend that in this case its of no significant difference to us in this case.
But of course I didn't.. We stuck a wheelie bin on top of my shed roof and perched the still full tank on top of that which put it at fifteen feet from the floor, thirteen feet above the carbs,
This is what the gauge said. About 1.5 psi. The bike started, idled and revved normally no leaks. I did have a problem wit a sticky float valve early on in the experiment on carb no 3 but that was cleared up by tapping the offending bowl with a hammer after that no leaks whatsoever. I have not touched the bike since middle November last year.
I hope this helps clear this up.
The only thing that I wish I'd'v done was drain off ten or fifteen litres and seen what the gauge said but I didn't think of it at the time.
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(purely for some great photographic effects, of course)
