| Author | Message | ||
     Swordsman |
I know it's pretty common for the fuel pump to be audible, but why is it loud some days and dead silent on others? ~SM | ||
| Andymnelson |
Mine whines more when ambient temps are above 85 or so, which kinda worries me- feels like it's going to fail on me when it's warm out. | ||
| Mr2shim |
I've been wondering the same thing. | ||
| Boliver |
If my tank is almost empty I can hear it quite well.Other than that it just sounds like any other electric fuel pump to me. | ||
| Diablobrian |
It can cavitate (form vapor bubbles in the suction) more easily when the fuel is warmer. The lower pressure zone at the pump intake effectively lowers the temperature at which the fuel turns into a vapor. These bubbles make noise as they go through the pump. We used to have the same thing happen when I worked on pumps in the Navy. It usually goes away when the lines are filled with fuel and up to pressure as long as the pump has enough fuel over it to prevent it from sucking air/vapors in from a mostly empty tank. | ||
| Nillaice |
cavatation makes sense, and meets all the symptoms. but i would not think that it is actually cavatating. how much d/p does the pump make? | ||
| Xl_cheese |
I changed my 04 fuelpump out for an updated 06 version and the whine is MUCH quiter. And the bike doesn't stumble as much when the tanks nears empty. |
