| Author | Message | ||
     Surfsofa |
Just got back from a day's riding (about 200 miles) and after shutting off the engine (and removing the key) I noticed an intermittent whirring sound, the same one as when the key is turned to 'on'. I'm guessing this is the fuel pump priming, but why would this happen after shut off? Seemed to stop after about 5 minutes. Is this normal, and if so what's the purpose? | ||
| Ebrfan |
It was hot and that is the fuel pump running as it was programmed into the machine to cool it off. | ||
| Dannybuell |
the fuel pump stays on to prevent a heat soaked engine from vapor lock | ||
| 1_mike |
Now I've heard everything..! Explain how a running fuel pump has ANYTHING to do with heat soak..!? Vapor lock...oh-boy. Vapor lock and electric fuel pumps DO NOT go together. SOoo...many myths. Surf - Hint - Do not stick your finger in the fan ! Mike | ||
| Willmrx |
The fuel pump comes on after the bike being shut off, to maintain pressure in the fuel lines/system to prevent the fuel from boiling. It has been discussed hear before. Fuel under pressure boils at a much higher temperature. | ||
| Dannybuell |
1_mike - I am not making this up, this was discussed about 6 years ago on the 1125 forum... google it. 24K miles on my CR | ||
| Panshovevo |
Vapor lock is not going to happen in a system where the pump is pushing the fuel to the engine. It only happens in systems that are pulling fuel from a tank that is lower than the pump. It is true that the higher the pressure of a fluid, the higher the point of vaporization. I have no experience with an 1190 yet (although I have a strong feeling it's going to happen soon) but I have yet to hear the fuel pump run after shutdown on my CR or my R. Fans for a minute, and IAC briefly, but no fuel pump. Does it make any difference what ECM you have, or what flash? | ||
| Ebrfan |
Panshovevo, it may matter which ecm you have, but it is more than likely based on temperature after shutdown in all the ecm's. I have not heard my pump come on after shutdown since removing the oem ecm and secondary muffler. I've changed the exhaust systems around three times now with the fully programmable ecm, but the bike also runs cooler with the free flowing exhaust and lack of cat heat. | ||
| Froggy |
It is temperature related, I've only heard the whine during the hotter parts of summer. | ||
| Zac4mac |
It's not like a semi hitting its jake brake, it's subtle and high pitched. Most metal-heads will never hear it because they can't hear that frequency anymore... It DOES give a good look into your fuel rail pressure integrity. A well sealed fuel rail will pressurize every 30-45 seconds. for only 10 minutes. Leaky injectors(usually) will cause more frequent cycles. All very subjective, but valid nonetheless. Z | ||
| Panshovevo |
It's been plenty hot this summer, but like Zac said, my hearing is bad in some of the higher frequencies. I can't hear crickets any longer...we have an electronic ear thermometer that beeps when finished...I can hear it with my right ear but not my left. Both bikes have aftermarket free flowing exhaust systems. | ||
| Rocket_scientist |
Send an email to tech@ebr.com if you are concerned about the fuel pump noise, and possible causes. However, Dannybuell is correct, it does do that by design. | ||
| Zac4mac |
When the 1125 first came out, the ECM would run the pump for 20 minutes. A couple of ECM reflashes later, they went to 10 due to dead battery issues. Feel free to check the archives. Z |
