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Fuel gauges

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tigeryak18t

Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE

Posted: Sat Oct 17, 2009 1:09 pm Post subject: Fuel gauges

Hello to all,



again and again our plane are giving us pain (I like that one, it's from me!!!)

And Yes once again I had 2 surprises. I have one fuel gauge giving me a wrong info. It works like this. I am with full fuel (180 litters on my 18T). At the beginning my gauge on the left shows 90l but on the right 40l...that's wrong. I know it's wrong it cost me enough money. 1,7 Euros per litter here in France. Well you will tell me that's Paris...Wrong i am in the north of Paris. 50 km in the north, and here it is about an hour of driving....

So, back to the subject, after about half an hour of flight both gauges works fine with a good indication. Today I switched the two gauges. Just to check if it was coming from the instrument panel or the gauge itself.

It happens that now I have two wrong figures. Well not to bad on the good gauges (which is now on the right tank...are you following!!!) but same wrong 40l indication on the left tank (with the right gauge... ok it is a little tricky...).

The gauges looks fine with a plastic foam floatter. Does anyone have had this problem already???

Does anyone knows how they works and if it is possible to repair it??

And perhaps an electrical schematic?????

Well any help would be welcome.



And if anyone of you happen to pass by Paris France I certainly will be more than happy to show you the region from above.



Thank very much and see you on the next subject!!!



Didier Yak18T HA-JAC

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Vic

Joined: 12 Aug 2008
Posts: 115
Location: Southern Bavaria

Posted: Sun Oct 18, 2009 4:26 am Post subject: Re: Fuel gauges

Hello Didier,

we had the same problem this year with our 18 T. The reason for wrong fuel readings is the fact that the float is no longer floating as the plastic foam has shrinked a lot and the float does no longer produce enough lift. Did you use auto gasoline a lot in recent years as we do ? I wonder if somebody else had misreadings of the fuel state with other Yak types as well and did he check the floats if there is the same foam type installed. There are sheet metal floats too on other Russian aircraft which will not shrink with modern fuel but could develop a leak and will drown in consequence.When you take out the fuel sender unit and move the float lever by hand you should get perfect readings on the gauge for all positions.

You could add a very light spring to the float to assist as we did, but basically IÂ´d like to know if someone could provide a metal float.

 By the way, we had in the past uneven readings betweeen the left and right wing tank in flight, so we suspect having been fooled by sinking floats for some time.

Kind regards

Vic

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tigeryak18t

Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE

Posted: Sun Oct 18, 2009 4:47 am Post subject: Fuel gauges

OK that's very interesting Vic,

I have this problem since not a very long time but the annoying thing is that when in flight since about half an hour an hour it comes back to normal. Probably the floaters sinks and with vibrations it come back floating....

  I will ask my operator in Hungary and also Termikas in Lithuania and I'll let you know what they say. Then I will also ask friend builders. they are really very smart and see what they think about that floaters thing. If it can be repaired or replaced.

  I have heard about these metal floats. I'll tell you also if Termikas has them.



Thanks a lot for your answers.



regards



Didier





2009/10/18 Vic <vicmolnar(at)aol.com (vicmolnar(at)aol.com)>

   	  Quote: 	
		  --> Yak-List message posted by: "Vic" <vicmolnar(at)aol.com (vicmolnar(at)aol.com)>

   

 Hello Didier,

 we had the same problem this year with our 18 T. The reason for wrong fuel readings is the fact that the float is no longer floating as the plastic foam has shrinked a lot and the float does no longer produce enough lift. Did you use auto gasoline a lot in recent years as we do ? I wonder if somebody else had misreadings of the fuel state with other Yak types as well and did he check the floats if there is the same foam type installed. There are sheet metal floats too on other Russian aircraft which will not shrink with modern fuel but could develop a leak and will drown in consequence.When you take out the fuel sender unit and move the float lever by hand you should get perfect readings on the gauge for all positions.

   You could add a very light spring to the float to assist as we did, but basically I´d like to know if someone could provide a metal float.

  By the way, we had in the past uneven readings betweeen the left and right wing tank in flight, so we suspect having been fooled by sinking floats for some time.

 Kind regards

 Vic

 

 

 

 

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Didier BLOUZARD

didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)

0624243672

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French Wing

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