Wouldn't it be a better option to rather have two systems ie. Tank....T piece1....Filter1....mech pump....T piece2....T piece 3....carburators... and ..Tank...T piece1....filter2........Backup pump....T Piece2...... for incase the filter1 blocks real bad or mech pump fail.
(Only if the backup pump does not let fuel through in reverse)?
Fuel pump unnecessary
Re: Fuel pump unnecessary
Here is my fuel system, posted before.
If you look carefully you will see it has built in double redundency, even triple redundency.
Gravity feed, electric fuel pump (does not overcome float needles due bleed back via restrictor) and mechanical pump.
This design evolved from my first microlight in the early eighties and is the one fitted in my current plane, will be fitted to any plane I build.
I am always surprised to say the least when I see a fuel system on a trike which relies soley on that little Mikuni lift pump to raise the fuel upto half a meter to the carbs, and yes, I am an AP as well as AME.
These fuel pumps are pretty bullet proof but the point is that they are the ONLY pressure source. If you open one of these pumps you will see all that is required to piss on the camp fire is one grain of sand stuck under a reed valve, coming in through that little vent hole. Another show stopper is a cracked pulse line to the pump.
Speaking of vent holes, never forget to inspect your tank vents (you do have 2 don't you? theres that redundency thing again) on a regular basis and cover them when you put your baby to bed.
As mentioned a couple of times on this thread, apart from the safety aspect, an electric pump is very usefull to prime the carbs after a long layover, saves your starter and battery from needless wear and tear cranking away to fill those carb bowls with that little pulse pump, revs below idle.
The bit about emptying your fuel sample onto your airfilter:
, don't get Boet started on that one. Yes you will get a rich mixture for start but you are also washing out the airfilter oil that should be there and slowly destroying a good airfilter.
If you look carefully you will see it has built in double redundency, even triple redundency.
Gravity feed, electric fuel pump (does not overcome float needles due bleed back via restrictor) and mechanical pump.
This design evolved from my first microlight in the early eighties and is the one fitted in my current plane, will be fitted to any plane I build.
I am always surprised to say the least when I see a fuel system on a trike which relies soley on that little Mikuni lift pump to raise the fuel upto half a meter to the carbs, and yes, I am an AP as well as AME.
These fuel pumps are pretty bullet proof but the point is that they are the ONLY pressure source. If you open one of these pumps you will see all that is required to piss on the camp fire is one grain of sand stuck under a reed valve, coming in through that little vent hole. Another show stopper is a cracked pulse line to the pump.
Speaking of vent holes, never forget to inspect your tank vents (you do have 2 don't you? theres that redundency thing again) on a regular basis and cover them when you put your baby to bed.
As mentioned a couple of times on this thread, apart from the safety aspect, an electric pump is very usefull to prime the carbs after a long layover, saves your starter and battery from needless wear and tear cranking away to fill those carb bowls with that little pulse pump, revs below idle.
The bit about emptying your fuel sample onto your airfilter:
, don't get Boet started on that one. Yes you will get a rich mixture for start but you are also washing out the airfilter oil that should be there and slowly destroying a good airfilter.- Attachments
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- BB500fuel.GIF (8.44 KiB) Viewed 946 times
Nottaquitta
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