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Petcock output mystery

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Petcock output mystery

PostAuthor: sbrbot » Mon Feb 12, 2018 8:25 pm

On xv535 motorcycle electromagnetic petcock is under the lower (main) tank. It has two tubules immersed in the tank - higher taking fuel when the fuel level is normal, and lower one taking fuel from the bottom of tank when fuel level is low (on reserve). In order petcock to start taking fuel from reserve one should switch from "ON" to "RES".

Now mystery - petcock's output goes again into tank! Maybe I'm wrong but it seems that fuel from petcock actually does not go into tank but into tube which passes through the tank (exiting on top of tank) then goes further -> to fuel filter -> fuel pump -> carbs. Is that correct that fuel exiting from petcock goes into tube which passes through tank!? Why it does not go directly to fuel filter through rubber tube?

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Re: Petcock output mystery

PostAuthor: Bubba1982 » Wed Feb 14, 2018 8:19 am

Wow your tank is in good condition!! What year is your bike? I Just removed mine due to a leak (poor repair by a previous owner) and mine is looking very sorry for itself..

In answer to your question, I think the reason it's designed this way is to allow the fuel pump to draw the fuel up when switched to reserve, that's what I think from looking at it on my bike, seems such a complex system, they should have just stuck to basics and gravity fed fuel and not made the frame part of the air induction/ house the huge air filter.

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Re: Petcock output mystery

PostAuthor: sbrbot » Wed Feb 14, 2018 9:39 am

Indeed, this tank is in excelent condition but that's not my tank. I took this picture (already ulpaded file in past) from this forum. I haven't disassembled my tank yet. If I had disassembled it I would have cheched this mystery with pipe through tank :-).

OK, basic gravity fed fuels has its own drawbacks (leak). Fuel pump generally is barrier between tank and engine and prevents leak into carbs when motocycle is turned off.
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Re: Petcock output mystery

PostAuthor: Bubba1982 » Thu Feb 15, 2018 8:07 am

fair enough :-)

sbrbot wrote:Indeed, this tank is in excelent condition but that's not my tank. I took this picture (already ulpaded file in past) from this forum. I haven't disassembled my tank yet. If I had disassembled it I would have cheched this mystery with pipe through tank :-).

OK, basic gravity fed fuels has its own drawbacks (leak). Fuel pump generally is barrier between tank and engine and prevents leak into carbs when motocycle is turned off.

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Re: Petcock output mystery

PostAuthor: sinoda » Wed Jun 20, 2018 11:48 am

Do you need to remove the back wheel in order to be able to remove the tank ?

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Re: Petcock output mystery

PostAuthor: bstig60 » Wed Jun 20, 2018 12:34 pm

Do you have a service manual?
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province and Country. It is easier to help you if we know where you are.

SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

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Re: Petcock output mystery

PostAuthor: Hotdog » Wed Jun 27, 2018 7:13 pm

sinoda wrote:Do you need to remove the back wheel in order to be able to remove the tank ?

You will want to remove the battery,battery box, remove wheel at least enough to move back a few inches, remove front section of rear fender ( not necessary to remove whole rear fender, and remove side bar with passenger foot peg attached to it.
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