briana(at)xtra.co.nz
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 Posted: Fri Jan 31, 2014 7:07 pm Post subject: 912 fuel pump |
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The recent Rotax SB on swapping out the fuel pump got me thinking. While my engine serial number was not one included in this SB it is a pretty old engine. It’s been flying now for 13 years, although only just 500 hours. It still had the original fuel pump.
I decided that it was time to change to the new design. Fitting the new one was easy, although because it is slightly different in shape from the original, I had to relieve a little area inside the cowling to provide clearance. I suspect my engine is actually mounted perhaps 1/4" further forward than necessary, making the fuel pump clearance to the front of the cowling very minimal. Mmm - - note to myself, next time I have the engine out make two new engine mounts, i.e. the angle aluminium pieces bolted directly to the engine sump, and shift the whole engine back just a smidgen.
Out of curiosity I cut the old fuel pump open to check the state of the diaphram. It still looks pretty good. There is clearly some discolouration of the diaphragm, but it is still perfectly flexible. Of course I can’t compare it to a new one, but it still looked to have a deal of life left in it.
Here’s a pic of the disassembled unit.
Brian
[img]cid:5E035D74-900E-47C9-9F73-38FC85153D30(at)Belkin[/img]
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