The CB1100 Community Forum

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?

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.

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

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.

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

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.

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