Gas Tank Switch makes motor die.

[bd]

When was the fuel filter last replaced?  Check the fuel pressure from both tanks.

[bd]

Have you verified the right tank has sufficient fuel in it?

[JohnnyPopper]

Thx bd, I bought it recently, don't have data on the filter status.

Confirmed I have gas in the RH tank.

I take it that these have internal pumps, I will get to within earshot of each and get back to you.

[bd]

In addition to the other suggestions, drain a one-quart fuel sample from the right tank into a transparent container and let it sit overnight, if necessary, to see if it's clear or if there is any separation of the fluid into layers.  Make sure the liquid is actually gasoline and not water or diesel, etc.

[JohnnyPopper]

bd,

as a clarifying note, I filled up both of these tanks at the same time when C-19 lock downs began, c. 3/2020. I will do the check as you recommend and post results.

Thanks!!!

[Big Dee]

As a diagnostic process, bypass the valve. new hoses never hurts, unless done wrong.

Is the fuel gauge working right?

Will never understand why someone would risk life for some gasoline.
Bad karma for them also.

forgiveness

[JohnnyPopper]

Yes, both fuel gauges work when I switch between tanks.

I think bd has this, notice it takes 2-3 seconds to die after the switch is thrown. Pry a bad fuel pump on the right side.

Got called out of town, so will be back on it this weekend