I've read that both the main and aux tanks should read the same level until about a 1/4 tank, then show different, and this is used to justify having one working sender.

My tanks are showing between half and 3/4, - and show movement on the gauge between main and aux. less than a quarter difference, but enough to see movement.

Can someone explain these two things to me? What am I missing?

I've read that both the main and aux tanks should read the same level until about a 1/4 tank, then show different, and this is used to justify having one working sender.

My tanks are showing between half and 3/4, - and show movement on the gauge between main and aux. less than a quarter difference, but enough to see movement.

Can someone explain these two things to me? Wht am I missing?

So, sitting still on my drive. Main reads one level, switch to aux, reads another level.

What I'm not clear on, is can this be normal?
Can this happen, with nothing actually wrong with the system?

Or do I need to start tracing down a problem because there are different readings?

In a perfectly functional system, is this normal, or a possibility?

I am about to drop the tanks and re hose and refresh the fuel system. This is why I'm asking, so I can take the time to fix this too while they're down. or try to, any way.

if, in a new system, it worked that the main and aux tanks read exactly the same until less than a 1/4 tank, and mine are reading differently at 1/2 to 3/4, then I can assume there is something amiss with my system.

if this (different readings) cannot be because there are different amounts of fuel in the different tanks, because they self level, then I will again assume there is something amiss with my system.

are my assumptions correct?

thanks again.

Thanks Ken. I'll do 3 first.

Thanks Ken. I'll do 3 first.