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Fuel primer.

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Jeffrey Dill

Joined: 23 Jul 2007
Posts: 52
Location: Pleasant view, TN

Posted: Mon May 31, 2010 5:00 pm Post subject: Fuel primer.

After troubleshooting fuel leaking out of one of my Bing carbs while the engine was not running, I figured out that the source was the primer line. My assumption was that years and ethanol combined to erode the innards of my primer and I perused Aircraft Spruce for another. I saw a plunger type, just like the one I had, and a bulb type. If you do a search on Aircraft Spruce for "fuel primer" you will see my choices. I chose the bulb type because it was lighter. Anybody who flies a model 2 would understand that.  It came quickly and I installed it, only to find that I still had the leak. So now I must ask what is going on? Why does a new primer allow fuel to flow when not pumped? Is there something about the plunger type that makes it required for my bing carbs? If I remove the primer entirely, how do I deal with the leftover holes in my carbs?

http://www.aircraftspruce.com/search/search.php

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Jeff Dill
Model 2

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Mon May 31, 2010 5:14 pm Post subject: Re: Fuel primer.

Jeff, 



Stay away form those bulb type primers- trouble lurking.



Call Rotax 866-418-4164  and get a new one. about 20$ . 



ACS  here  http://www.aircraftspruce.com/catalog/appages/primerkit.php    I AM NOT SURE about the Red fuel line though....  I have not sued so I cannot vouch for the integrity .



They can leak after a while yes--- I turn off my fuel shut off when not flying. Make sure you are plumbed after the shot  off for your primer. 

I had a old Kitfox 2 here that flew in -- I did a service - Get this  --



the fuel line that went from gascolator to impulse fuel pump had cracks in it ........  i touched it and it squirted out --- SCARY !!  and it was that Black automotive fuel line............. i replaced them all with blue urethane fuel line and safety wire.

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Thu Jun 03, 2010 5:57 am Post subject: Re: Fuel primer.

Jeffrey, there are plugs available to cap off the primer ports if you remove the primer.  part number 860-610  http://www.rotaxparts.net/scripts/prodView.asp?idproduct=1343



I would remove the primer and plug the ports for a while to be sure that it is the primer causing the overflow.  It might be a needle and seat/float level problem.



By the way, I installed a primer this winter after cranking the crap out of my starter trying to start in cold weather with the fuel enricher/choke system.  My starter will probably last for ever now.  Three squirts of the plunger and she starts soon as the starter engages.

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Jeffrey Dill

Joined: 23 Jul 2007
Posts: 52
Location: Pleasant view, TN

Posted: Tue Jun 08, 2010 4:20 pm Post subject: Re: Fuel primer.

Thanks guys for the help. It was just like both of you said. A new bulb type primer allowed fuel to flow when not actuating the primer, just like the worn out plunger type. A replacement plunger type did the trick. Something worth noting which you guys may already know. I think the added fuel into my carburetors from the old primer caused a drop in my idle speed. That was the whole reason I opened the hood in the first place; on my first flight of the season, my idle was down well below 2000.

I had turned each idle stop up one quarter turn before I noticed the gas leaking out of one carb. Today, with the plunger type new primer installed and working properly, I warmed up the engine to check the idle and, sure enough, I had to turn back the idle stops to where they were before to reduce the idle back to 2000.

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Jeff Dill
Model 2

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