Changed my tank and now the gas gauge is incorrect

[shotgunsmitty_imp]

So three days after buying my brand new CB1100, I hit a deer. Yes, I'm okay, kept the bike upright, folded a turn signal back into the tank, and the deer's head hit the tank as well...two large dents in it the tank. I kept driving it until the claim check came in, and ordered a new tank.

So I replaced the tank...wow, this was not as simple as I thought it was going to be.
I removed the seat, removed the side cover (left), and disconnected the electrical connection.
I removed the tank bolt, lifted up the tank, removed the rubber boot and bolt, and then removed the vent line. I then disconnected the fuel line (interesting state of the art connector there, I might add) and slid the tank off. No problems there.

The new tank was bare, and I removed the bolts to the plate that holds the fuel pump assembly. It was tricky getting it out, but I did not force it, I just turned it until it came out, being careful to not tweak or bend the fuel float arm. I moved this assembly over to the new tank, reinstalled it the same way, and moved the gas cap over to the new tank as well.

I dribbled about a half a gallon of gas into the new tank after reinstalling everything (side cover, tank bolt assembly, seat, etc) and headed to the gas station.

When I pulled out I heard a clunking coming from inside the tank, like the fuel float was bumping the side of the tank perhaps on the inside. After a few seconds (30 or so) it stopped. I continued to the gas station and filled her up.

After filling up, the gas gauge read 1/2 tank. It also did not tell me my mpg on trip A where it was currently set. After about a mile, it jumped to 3/4 tank, but I know this to be false, because it was a full fill up, it should have read full tank.

Did I do something wrong? What was the clunking? Has anyone ever run into this? Is there a reset for the computer that resets the gas gauge?

Thoughts, folks?

[Lord Popgun]

The tank is very simple to change and like you said, the hardest part is that dang fuel connection.

I would guess that with only 1/2 gallon of fuel you might have been hearing the float banging in the botton of the tank.

There is no special reset for the computer for a pump change. As far as MPG, it will take a little riding for the computer to calculate it.

Not coming up to full I don’t really have an answer for unless the float is somehow hung up, or you put on a larger fuel tank from a different model.

I have a ‘13 and due to a garage incident had to replace my tank. Everything went smoothly though.

[Cormanus]

My gauge sometimes shows one bar down immediately after I’ve filled the tank. I’ve no idea why. It’s an intermittent fault.

[Lord Popgun]

Cormanus, I’ve seen mine do that too after filling on the sidestand. Usually while riding away and maybe even hitting a bump, all is well. I just figured its due to the way the float mechanism works.

[Cormanus]

I’ve assumed there’s something sticking in there occasionally. You’re likely right popgun.

[shotgunsmitty_imp]

Update: Thinking I may have bent the float arm removing it and reinstalling it, I have removed the tank and re-bent the float arm so that it reflects a full tank. More to come later I'll let you know if this works.

[Houtman_imp]

Bent it a little more and you will always have a full tank of gas !