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psm(at)att.net
Guest

Posted: Wed Feb 08, 2012 5:59 pm Post subject: Zenith601-List:

Steve,



I mounted the senders on my XL on top of the fuel tanks.  They work 

fine.  I would be concerned about leaks mounting on the side of the tank.



I have heard some owners worry about tank leaks from senders that are a 

problem even on top of the tank.  There is no easy way to isolate and 

repair these since the skin is riveted over the tank.  I am taking the 

chance, but I've heard some people installed inspection ports over the 

sender for possible repairs.



Paul

XL in flight test

On 2/8/2012 4:15 PM, Steve Look wrote:

 	  Quote: 	
		   



 Howdy,



 Just received my fuel senders today. The plan shows them mounted in 

 the side of the tank and then bending the sender arm into a "Z" shape.

 Looking at the "B" upgrade stuff, I see the factory plane has the 

 sender mounted on top. I've never seen a plan for doing that.



 So.... are there opinions on which is better to do and is 

 documentation available for the top mount? Seems like that might be 

 less prone to leak.



 Thanks,

 Steve



 Steve Look

 Monticello, IL

 601XL

 "Dogs have owners, Cats have staff"

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merlin

Joined: 05 Oct 2008
Posts: 15
Location: Fair Play, S.C.

Posted: Thu Feb 09, 2012 4:41 am Post subject: Zenith601-List:

I mounted mine on the side as the plans show. I used a 2 part sealer (B1/2) that is used to seal the wet wings on the aircraft I fly for the Army. I filled both tanks up with fuel and let them sit in the sun for several hours. No leaks and will probably never leak. I don't trust fuel guages in small airplanes anyway. The best fuel guage is your head. Know what you start with, know your fuel burn ( fuel flow meters are very accurate) and dont fly too long. 

  

 Oh, the sealant I used is make a MESS but it works great. I think Vans carries it and also Aircraft Spruce.

  

 Have Fun,

  

 Jeff Webb

 Fair Play, SC



 

   From: Steve Look <slook(at)mchsi.com>

To: zenith601-list(at)matronics.com

Sent: Wed, February 8, 2012 7:15:55 PM

Subject: Zenith601-List:



--> Zenith601-List message posted by: Steve Look <slook(at)mchsi.com (slook(at)mchsi.com)>



Howdy,



Just received my fuel senders today. The plan shows them mounted in the side of the tank and then bending the sender arm into a "Z" shape.

Looking at the "B" upgrade stuff, I see the factory plane has the sender mounted on top. I've never seen a plan for doing that.



So.... are there opinions on which is better to do and is documentation available for the top mount? Seems like that might be less prone to  leak.



Thanks,

Steve



Steve Look

Monticello, IL

601XLcs.com/Navigator?Zenith601-List" target=_blank>http://www.matronics.com/N========================



 [quote][b]

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Brad(at)ocbis.com
Guest

Posted: Thu Feb 09, 2012 1:19 pm Post subject: Zenith601-List:

Steve -



I'm in the process of mounting my senders on the top. My tanks are 2005

vintage and the tank top is real close to the LE skin, leaving clearance

issues to the skin.  What I ended up doing was making a spacer plate that

mounted the sender inside the tank by a 1/4 inch, giving me enough

clearance. My thinking is that having the sender at the top is going to have

to minimize leaks just because it is not going to be immersed in the fuel

all the time like the side mount sender is.



As for future reparability, I counted the main spar rivets so I know exactly

where the center of the sender is and made measurements using that rivet for

reference, and logged it.  So now I know exactly where to cut in the future

to replace it (if I have to). I'll fab a cover at that time if needed.  To

me, a leak seems a lot more likely than the sender going out. Also if a leak

did develop and I could not repair it quickly, I could lower the fuel level

in the tank to stop the leak with the sender at the top, where it would just

keep leaking with the side mount.



Good luck with it. - Brad

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