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Leaking around fuel tank sender unit

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william(at)wbliss.co.uk
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Posted: Thu Aug 30, 2012 10:51 am Post subject: Leaking around fuel tank sender unit

Hello all - advice and experience please

I discovered that fuel is leaking from the gauge sender unit which is 

mounted inside the pilot headrest - an obvious cause of the fuel smell. 

I was calibrating the fuel gauge.

I would like advice on how to reliably seal it.

Now all removed (WEMA unit). It was fixed with 5 partially threaded 

bolts through holes drilled in the GRP tank. The bolts clamp rubbery 

sealing rings on either side of the tank. The sender unit screws into an 

aluminium ring outside the tank and is sealed by with an "O" ring. There 

is a split aluminium ring inside the tank with captive nuts attached 

(the bolts did not feel as if much thread was actually engaged). Brown 

sealant had been applied over the whole lot. There is fuel staining on 

the tank facing surface of the inner rubber ring.

The tank material itself feels quite slippery - difficult to sand a good 

key for sealant bonding. Especially difficult on the inside due to 

restricted access.  There are some raised blebs and grooves to contend with.

The only good things to report are that I have ordered more sealant from 

LAS, the rubbery seals look ok and I havn't dropped anything large into 

the bottom of the tank yet.

William G-WUFF

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stephen vestuti

Joined: 05 Jul 2011
Posts: 62
Location: Wales, UK

Posted: Fri Aug 31, 2012 12:54 am Post subject: Re: Leaking around fuel tank sender unit

Hello William,

I am also in the process of fitting the wema gauge in my fuel tank on a new buid - it also will be accessed later through the port headrest.

I don't know what you've ordered from las but I've sent for PR1422A fuel tank 

sealant. 

Mine only came with a rubber gasket, so the  sealant is mainly for the bolts although I will use it on 

both sides of the gasket as well as the bolts,



Steve. # 630

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wdaniell(at)etb.net.co
Guest

Posted: Fri Aug 31, 2012 4:38 am Post subject: Leaking around fuel tank sender unit

I did the same when I put the fuel sender in though I did it with the tank

out of the aircraft.  Now I look at it and wonder how on earth I am going to

service it where it is...Someone suggested a much better place which would

be between the headrests under an inspection plate.



Does anyone have any ideas about how to access the sender unit once one has

it in place under the head rest...errr perhaps turning the whole headrest

into an inspection plate - cutting it off at the base and putting a base on

it and bolting it down?  Ideas anyone?



Will

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stephen vestuti

Joined: 05 Jul 2011
Posts: 62
Location: Wales, UK

Posted: Fri Aug 31, 2012 5:33 am Post subject: Re: Leaking around fuel tank sender unit

Will, 

I had to put mine under the port headrest due to the length of the sender unit - it would not fit between the headrests.

however, where I've put it - next to the port headrest access hole, it is removable through that hole - perhaps yours is also ?



Steve # 630

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