Sticky primer

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1 day 12 hours ago #2500 by STEVE ELLS
Replied by STEVE ELLS on topic Sticky primer
No, the fuel is pulled into the suction created when the primer plunger is pulled aft.
The following user(s) said Thank You: TOM BRAEUNIG

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1 day 14 hours ago #2499 by TOM BRAEUNIG
Replied by TOM BRAEUNIG on topic Sticky primer
Is it necessary to turn off the fuel valve before pulling the plunger?

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1 day 14 hours ago #2498 by TOM BRAEUNIG
Replied by TOM BRAEUNIG on topic Sticky primer
Thank you Steve,
I found the primer repair kit at Aircraft Spruce for $6.50, probably would have been cheaper to just get the 2 O-rings.

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1 day 15 hours ago #2496 by STEVE ELLS
Replied by STEVE ELLS on topic Sticky primer
Hi Tom,
It shouldn't be particularly hard to operate your primer. You can remove the "guts" by unscrewing the cap and pulling everything aft. A little fuel will come out with the plunger but there won't be a flood.
It only takes two O-rings to reseal the plunger. They are MS29513-012. Aircraft Spruce and Specialty ( www.aircraftspruce.com ) sells these for $0.44 each. They measure 3/8 inch ID by 1/2 inch OD by 1/16 inch thick.
McFarlane Aviation ( www.mcfarlaneaviation.com ) sell a kit that includes the parts for $5.95.

It's possible that fuel based varnish has built up on the inside surface of the primer body. You can probably clean that off with acetone.

Although this is a simple job, it's not listed in the preventive maintenance list in Appendix A of FAR Part 43. However you are allowed to perform any maintenance task as long as a FAA licensed mechanic oversees your work.
The following user(s) said Thank You: TOM BRAEUNIG

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2 days 4 hours ago #2495 by TOM BRAEUNIG
Sticky primer was created by TOM BRAEUNIG
Is there any way to fix a sticky primer on a 172. My primer works OK, but it just takes alot of effort to pull the plunger out and push it back in.
Are there repair kits available for Cessna primers, or any tricks for freeing up the plunger?

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