Tipsy Nipper

I am having problems with obtaining a Primer and associated pipery to fit in my Nipper. The fuel pump is not always priming the injection system prior to start. Barry Smith's mod for fuel injection was to fit a primer into the circut thus ensuring plenty of fuel for the start, mine hasn't. LAS do flog primers but at an inflated price. I have also tried to find 1/4" T peices reducing to 1/8" but to no avail. Anyone got said items that they wish to part with?

Cheers JAB

.......ebay: http://cgi.ebay.co.uk/aircraft-fuel-pri ... 500wt_1156

All the other pipe bits will be available from LAS. If you are a Mogas user you will need a Viton O ring replacement......again I think LAS.

Neil

Thanks Neil. I am on the case

rgds John

.......if you don't get it let me know, I may be able to find one.

Niel

Hi John,

I hope that was you........£10 for a primer!! BARGAIN!!

Aircraft Spruce: http://www.aircraftspruce.com/catalog/g ... 03637b.jpg

Lifted from the Cessn 120 forum: Service letter 78-73 says that using NAS1593-012 o-rings "provides smoother primer operation, improved sealing, and longer service life" than the original AN6227-7 o-ring. They recommend replacing them at the next 100 hr. inspection. According to Geniune Aircraft Hardware Co. NAS1593 o-rings are made of Viton. Aircraft Spruce doesn't show the NAS o-ring but does sell MS29513-012 o-rings that "are resistant to fuel and are ideal for applications such as fuel ... primers." I then stumbled on McFarlane's website which seems to have the latest and greatest o-rings ever (for 13 times the price of an MS29513-012): "The MCM83248 series o-rings are 'fuel proof' FAA-PMA replacement o-rings. Only McFarlane has FAA approval to replace the old, less fuel resistant nitrile (MS series) and synthetic rubber (NAS series) o-rings with the latest fuel proof fluorocarbon o-rings! Flurocarbon rubber is commonly known as Viton. It is an advanced rubber that has extremely good fuel and heat resistance and is ideally suited for aircraft fuel system applications." So for the primer the o-ring you need is MCM83248/1-012. Here's a link if you need to order: http://www.mcfarlane-aviation.com/Produ ... 8%2F1-012& Or, if you're willing to risk the FAA checking whether you bought your Viton o-rings from a place that might not have the FAA's blessing to replace the original, you can get them for 36 cents from Sacramento Sky Ranch. (Quite a deal as they are normally priced there at $89 each!) http://www.sacskyranch.com/acatalog/Sac ... s_302.html

The links in the above para' don't work, but a good place to start.......or you could just pop down to your local Hydraulics shop and see what they have. As the article above says, the Viton O ring is the best, and will tolerate unleaded mogas.

Neil

Hi Neil.
Yes, a tenner worked quite well and thanks for the heads up plus seal info.
I tried to get down to Priory Farm yesterday but north of the Humber was black and thick - maybe next time.

Cheers John