I have a problem with the fuel pump sound not playing in FSX Acceleration. I have not had this problem in the past when running FSX with SP1 on my older computer. When the fuel pump switch is turned on, there is no sound (and yes, the master switch is turned on.) I can hear other cabin sounds like the flaps, but not the fuel pump. This problem occurs when using the default C172. I've also tried the default Baron and also don't hear the fuel pump. I've checked the sound.cfg file for the C172 and there is a reference to the fuel_pump wave file. The fuel_pump.wav file in the sound folder plays fine in Windows Media Player.Strangely, when I use the Flight 1 C172, I can hear the fuel pump at some airports, but not others. When I checked the sound.cfg file for this aircraft, I don't even see a reference for the fuel pump.Anyone have any ideas?Thanks,Mike

I have a problem with the fuel pump sound not playing in FSX Acceleration. I have not had this problem in the past when running FSX with SP1 on my older computer. When the fuel pump switch is turned on, there is no sound (and yes, the master switch is turned on.) I can hear other cabin sounds like the flaps, but not the fuel pump. This problem occurs when using the default C172. I've also tried the default Baron and also don't hear the fuel pump. I've checked the sound.cfg file for the C172 and there is a reference to the fuel_pump wave file. The fuel_pump.wav file in the sound folder plays fine in Windows Media Player.Strangely, when I use the Flight 1 C172, I can hear the fuel pump at some airports, but not others. When I checked the sound.cfg file for this aircraft, I don't even see a reference for the fuel pump.Anyone have any ideas?Thanks,Mike

Yes, it's a transitory sound only, so you hear the sound of the pump starting, then it ebbs away to nothing. That way it doesn't suck fps from the system - you wouldn't normally hear the pump anyway, as it is generally only used at high power settings when its smothered by the engine and prop, or at idle on approach when it disappears into the background melee of wind noise and squeaks and groans. FS has long been this way so it's not limited to FSX

Did they ever install a fuel pump in the RW C172? The one I took lessons in years ago didn't have one. All gravity feed.

The realworld 172R Skyhawk information manual I have calls out the fuel priming procedures to start the engine using the auxilary fuel pump (by using the fuel pump switch on the panel.) The manual also describes that there is an engine driven fuel pump.Following this procedure, the engine is not running, therefore the pump isn't drown out by the noise of the engine. I'm not sure how loud this pump is in real life.What is confusing to me is that I clearly hear the pump of the default C172 in FSX SP1, but can not hear it ever in FSX Acceleration. When using the Flight 1 C172 in FSX Acceleration, I can hear the pump when the sim is loaded to certain airports, but not at other airports. I don't even hear an initial sound. When I can hear it, it is a constant sound and does not fade away.

The realworld 172R Skyhawk information manual I have calls out the fuel priming procedures to start the engine using the auxilary fuel pump (by using the fuel pump switch on the panel.) The manual also describes that there is an engine driven fuel pump.Following this procedure, the engine is not running, therefore the pump isn't drown out by the noise of the engine. I'm not sure how loud this pump is in real life.What is confusing to me is that I clearly hear the pump of the default C172 in FSX SP1, but can not hear it ever in FSX Acceleration. When using the Flight 1 C172 in FSX Acceleration, I can hear the pump when the sim is loaded to certain airports, but not at other airports. I don't even hear an initial sound. When I can hear it, it is a constant sound and does not fade away.

I don't think you understand the use of the pump. The pump is used in 2 ways:1: To pressurise the fuel system: ALL fuel injection systems require positive pressure in the fuel system to force the fuel through the lines. They achieve this by having a closed system, with no venting to air unless the blow-off valve engages. Exactly the same as a car, when you release the fuel cap you hear a release of pressure. Even if the engine is no longer running. The aux pump is therefore only used to pressurise the system. Once it has pressurised the system, it stops or can be stopped by the pilot, unless it needs to re-pressurise the system. So it will not run constantly unless there is a problem with the fuel lines - or with the internal engine-driven pump once the engine is fired up. 2: To act as a back-up to the engine-driven fuel pump in case of failure during a crucial phase of flight (takeoff and landing). In both cases the general noise of the avionics and engine drowns out the pump sound and it is shut down when no longer needed. It is for this reason the pump sound does not `persist` in FS - if you ran that sound loop constantly it is a waste of computer resources when other noises should take priority. The number of noise sources has a direct effect on fps in FSX.I hope this explains things but if you need a more stimulating fuel pump sound, you can find replacements - there's at least one in the Avsim library. I grant you it isn't exactly like real life, but then the sim isn't real life and concessions need be made.