I may be corrected here, but Service Bulletin SB11E relates the changing the early electric pump in the engine bay design It refers to Mod instruction Nr 3 ((Arbritsanweisung) (Also Work instruction 27 which seems the same)
That instruction is a detailed description and pictures of the fuel pump installation and the routing of the fuel lines. I had to carry out this mod (S/no 3537) .. But presumably was embodied in later serial no’s. … and should have been updated in the Maintenance manual When I had the final (NZCAA) inspection, the inspector did pick up the 1500 hr limit on the Hardy fuel pump. Was replaced by a new one from the factory. However the “electronic “ ones have a much longer life. But they don’t seem to stop “ticking” like the old Hardy ones . Just keep running. From: [email protected] Sent: Tuesday, 12 November 2019 8:45 p.m. To: [email protected] Subject: Re: [DOG mailing list] H 36 electric fuel pump It's really important to check for fuel leaks prior the first flight of the day and any others on every flight. In addition to what Greg mentioned about causes for lack of fuel line, pressurisation, the carby floats can and do stick causing flooding into (and even out of) the catch trays under each carb. It was a good move by GFA to require that the electric pump is tested during the DI AND during subsequent pre boardng checks. (Included in the F of the ABCDEF for the Aussie operators). Others may want to ensure this is done as part of their own checks where appropriate. Laurie Sent from Yahoo7 Mail on Android <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> On Tue., 12 Nov. 2019 at 2:47 pm, Greg Wilson <[email protected] <mailto:[email protected]> > wrote: The electric pump is under and in front of the fuel tank behind the seats, before the shut-off valve. The purpose of the electric fuel pump is to prime the fuel lines as well as a backup on take-off. It's good practice to turn the main switch and fuel pump on while doing the DI. You should hear it click until the line is primed. If it doesn't stop clicking, you have a fuel leak or a faulty needle and seat in one of the carbys. You can also disconnect the fuel line at the mechanical pump and measure how long the electric pump takes to fill a one litre bottle. The minimum flow rate is listed in the maintenance manual. If there's crap in the tank or wrong type of fuel valve has been fitted (NOT ball valve type) it won't supply the minimum amount. Cheers, Greg. Greg Wilson ---- On Mon, 11 Nov 2019 22:01:32 +1100 Jarek Steliga <[email protected] <mailto:[email protected]> > wrote ---- Hi, How to make sure the pump functions properly? Does it produce some audible buzz sound when switched on? When I disconnected the fuel hose at the carburetor and switched the pump on, no fuel flowed. Is this pump just a back up in case the main engine driven pump fails during take off / landing? What is the electrical pump's location relative to the shut off valve? As per diagram between the fuel shut off valve and the carb? Tank you in anticipation Regards Jarek
