Hi Jarek and fellow Dimona lovers!
While on the subject of fuel lines, I purchased my Dimona just after the
fuel lines had been replaced by a certified maintenance provider.
However, three items had been overlooked in the fuel system review, and
each required further attention:
1. Before emptying the tank and dismantling the hoses I recommend
disconnecting the hose at a carburettor and checking that the electric
fuel pump is capable of lifting fuel right up to the engine. My pump
clicked away but no fuel was delivered. Time-in-service around 1300
hours from a stated life of 1500 hours. On dismantling I found the
points were all blackened and out of adjustment, and I decided it wasn't
worth repairing. I bought a new pump direct from Hardi in Germany
without any hassle.
2. The fuel filter screen on the inlet side of the electric fuel pump
was coated with fibres, presumably from the old GRP tank. The aircraft
currently has a metal tank. This screen would be hard to clean without
removing the fuel pump, if only to see what you were doing. You might
not even know the screen was there if you didn't go looking for it.
3. The fuel drain has a very small rubber O'ring as the sealing
element. When I dismantled the push-type drain valve this O'ring
virtually fell apart. It was rotten. I researched the number of
accidents where a leaking fuel drain emptied the tank during flight,
leading to premature flight termination. Not a nice prospect.
I recommend checking the hidden items as well as the obviously visible ones.
Cheers
Martyn
--
Martyn Cook
New Zealand
On 29/10/18 6:18 AM, Jarek Steliga wrote:
Rob, Ian, Nigel,
Thank you very much.
Nigel,
I have asked the guy, who refused to issue the FORM1 for metric hoses
to give me his quotation for starndard ones (for which he says he is
able to issue the FORM 1). If his price is reasonable, then I am going
to use the standard hoses and just use the necessary
adaptors/reductions to fit the existing orificies in the carb and fuel
tank. Now having read your message I also intend to contact one of
Dimona service stations near where I live.
Best regards
Jarek
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