Hi Martyn, Re the electric fuel pump function...as part of the daily inspection and also the pre-boarding inspection between flights, we briefly run the electric fuel pump. (Only after pulling the prop through for the compression check!) The main purpose is to confirm that there is no carby float bowl sticking and subsequent flooding, which these carbs are known to do on occasions. Its also an opportunity to confirm that the electric fuel pump is actually pressurising the fuel lines and so confirming that its functioning Laurie Sent from Yahoo7 Mail on Android On Mon, 29 Oct 2018 at 5:20 pm, Martyn Cook<[email protected]> wrote: 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While on the subject of fuel lines, I purchased my Dimona just after the fuel lines had been replaced by a certified maintenance provider.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 > > --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: [email protected]
