Quote:
Originally Posted by HillMan Over the weekend, I noticed the engine check light illuminate and remain lit on my 2024 Bullet 350. Witnessing this on a new bike naturally raised concerns, yet the remedy turned out to be surprisingly straightforward. |
A good post. Definitely interesting to learn.
I have been where the OP is, but in my case, the check engine light does not come on in case of fuel level reduction. But since the Classic 500 is of BSIII era from 2016, they might have not bothered to check the same (who knows).
Just to understand, I have a rough cut section of the fuel tank shown below (pardon the artistry, it's a crude mockup on MS Paint). The cut section will look like this when viewed from the front or the rear of the vehicle. For members who are not able to visualize, you can Google the cut section images and understand the frame of reference I am trying to convey.
The three red curves indicate the usual positions in which a fuel pump will be generally mounted, but there might be special exceptions. The blue line indicates the minimum fuel level required to keep the fuel pump submerged. This is the dead volume, which cannot be utilized at all. If the fuel falls below this level, the vehicle will sputter and come to a halt and you may end up with a damaged fuel pump, which is expensive to replace.
The green line indicates the reserve fuel level, which should be your warning sign to fill up the fuel before reaching the dead zone. This is where your fuel level indicator will light up or start blinking (depending on your console).
The upper red line is the recommended limit up to which you should fill the petrol. If you fill beyond this level, you might choke up the canister circuit which is responsible for capturing the fuel fumes (a waste of fuel if you ask me). An illustration of a sample motorcycle has been shared below. The breather pipe is connected to the canister assembly, which captures any waste fuel. Excess fuel there is also dumped, which is why you should ideally avoid filling the tank fully (in BS4 and above).
Side cut section
An illustration of the evapo circuit (sourced from
here).
So, the usable range is significantly reduced and even if the tank level is 13L here, the actual usable volume quite less.
Hence, it is always advisable to fill up as soon as the fuel low level indicator is on.