Yahtee
21.05.2021 20:41:16
Could I have been hearing the sound of excess returning to the tank? That 'hum' sound I could hear sounded like that of the whirring sound you hear when you turn the key to on - only fainter. more
See full version: When are the times you should hear the electric fuel pump
Could I have been hearing the sound of excess returning to the tank? That 'hum' sound I could hear sounded like that of the whirring sound you hear when you turn the key to on - only fainter. more
If you were in doubt about your fuel pump spinning, could you go under the car and place your fingertips on the fuel pump housing and feel if it is?
All this being said - when the key is turned to "on", you hear it whir. What happens after that, once the engine is running? If the thing keeps running, then why does that whir sound only happen for a few seconds when you turn the key to on? Why doesn't it KEEP whirring, when in "on" position (without starting it)? Does it shut off for safety reasons, but then know when the car is actually running, that then it starts back up pumping again?, and THEN pumps continously without cycling? And the only reason you do not hear it is the sound of the engine drowns it out?
And then excess fuel not required by the fuel pressure regulator sends the fuel back to the tank to be recirculated all over again?
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A fuel pump should pump all the time when the engine is running, there maybe (if it's fuel injected) a pressure regulator to ensure sufficient pressure is there otherwise it is designed to pump the correct pressure for the carbs.
Any clues on how to diagnose the problem would be great! here
Got a problem with my thundercat - my fuel pump is constantly running, it did this before so I changed it for a different one and it fixed the problem and it went back to normal I.e. A couple of 'clicks' when you turn on the ignition and a click every now and then that you can feel with your hand on the pump. However, today it's started doing the same thing, 'clicking' constantly while the engine is running and getting quite hot. Does anyone have any ideas what might be causing it? My first thoughts are there could be air getting in somehow so it can't pressurise? Also, The carbs haven't been cleaned or balanced for a while so thought it be a problem there? It hasn't hydraulically locked with petrol which I guess it might do if it was leaking into the cylinders?
May be a silly question but How does the pump know to pump? Does it have an in built pressure sensor or does it work in another way? I guess this second pump could have failed too. Is there any way to test it? more
I think it's a sign that it's time for a new bike ;-) more
On my 916 the fuel pump runs for a couple of seconds when the ignition is switched on, this is to get the fuel pressurised it then stops until the engine's running. If the filter is blocked then the pump has a hard time and can overheat and even cause electrical problems.
I understand that the fuel pump is a backup system and switching it on provides an extra margin of safety in such situations. My question is, why does the POH recommend that we switch off the fuel pump after reaching a safe altitude (say 1000 ft). Wouldn't it be safer to just leave it on? Is there potential for harm in leaving the electric fuel pump on? Or this is done on common sense grounds: just to save maintenance and prolong the life of the backup system so that it is there when you really need it? [links]
This question is related to single-engined piston airplanes equipped with an electric fuel pump like the Piper Dakota/Arrow etc. The POH states that the fuel pump should be switched on for takeoffs/landing/approach and maneuvers.
The electric fuel pump is used to provide an extra safeguard against fuel starvation during critical operations in siphon fed fuel systems where either there is an increased risk of this happening or where sufficient altitude does not exist to resolve a problem such has switching fuel tanks or during takeoff and landing operations. While one could in theory continue to operate the electric fuel pump continuously throughout flight operations, it it not necessary and just adds additional wear and tear on the unit. here