Help removing fuel tank on 99 Bassa

[nwguy]

The manual I downloaded for my Bassa shows a quick disconnect fuel fitting under the tank. I lifted my tank part way off and so no  disconnect. There is a petcock on the left side of the tank bottom that the prior owner said was replaced maybe a year ago. Instructions for another Guzzi model describes such a petcock, saying to close it by turning the knob clockwise. So should I close the petcock and loosen the clamp that secures the braided fuel line to that petcock? This must be true since it's holding the tank down. The petcock has a knurled nut, which I assume is what you turn clockwise to close. I tried turning it without too much force and it wouldn't move. Penetrating oil on it? Here's  pic of the petcock and fuel line:





Looking up from below, here's a pick showing what the manual suggests is a vent line (green arrow) that appears to have come disconnected from a Y connector (blue arrow) while I was wrestling the tank. Is this correct?





This pic looking up shows what I'm guessing is the fuel regulator (yellow arrow) and the pipe leading off of it (red arrow) is the "reference vent" for it, so no line should be attached to it. Correct?





Seems like reinstalling this tank will be bear.

[guzzisteve]

Typical EV1100 tank w/manual tap installed. You got it right turn knob clockwise tight. I have used pliers & oil, then get a new one.
The hose in 2nd pic looks like the tip over valve line. And the Y who knows BUT there is a breather for cap area strait under cap on bottom of tank. It goes to under bike along with tip over valve line, could be the Y, can't tell from here.

Oh Yea, unplug the fuel level sender & mark wire plug, another one like it w/red band is for the old electric valve.

[nwguy]

This looks like mine. Would this be the one to get?

https://www.crustycycle.com/products/moto-guzzi-petcock-left-right-v7-sport-s3-convert-etc-14105400-copy

[guzzisteve]

Wow, spaced this out. BUT yes, that's it.

[marcmorrison]

I've owned my Bassa for abt. 7 years...I've not had to perform anything other than basic maintenance, but will share some of my experiences if that helps.  The "quick disconnect" on your fuel lines has likely been disabled and will require that you use good screw on clamps instead.  As for the fuel petcock, most of the electric engaged petcocks that came as original equipment have been replaced with the manual petcock that you currently have.  I have learned that the Chinese do not use good rubber o-rings in these petcocks....they will swell over a short time and start leaking as soon as you try to turn them off-on.  There have been some suggestions as to replacing these o-rings with Viton stuff, but not much success there either.  Bottom line on these manual petcocks....put a new one on and try not to mess with closing/opening the valve.  When I have to remove the gas tank on mine, I try to pump out as much fuel as possible before disconnecting the fuel lines, leave the manual petcock alone and proceed from there.  PITA but this is what works for me.  The original electric petcocks are no longer available, so you'll have to live with the manual petcock until something better comes along.

 If your Bassa is running rough, I would suggest replacing plugs (maybe wires as well), fuel filter, set valve lash, replace the TPS with the current CycleWorks unit (set it according to the required voltage), maybe replace the relays, check the throttle body rubber boots for leaks/cracks, check the ignition coils.....I realize this is a big menu, but if you don't know for sure the current condition of these components (and don't have a method to verify their operation), you will likely replace most of these items after all is said and done.  I think once you get things in proper working order, you'll discover the bike is really well constructed.