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Part# 05-03637


The kit is replaces the worn O-rings (2) on the primer pump used on non-fuel injected engine installations. The primer seals frequently are not re-lubricated until someone complains the primer isn't working or the engine is hard starting. This is most evident by the pump being hard or stiff to operate. Generally speaking, by the time the pump stops performing, the seals are worn (to the point that lube is of little value) and must be replaced.


  • Beech 19/23 Series
  • Cessna 120,140,150,152
  • Cessna 170, 172, 175, 177
  • Cessna 180, 182, 185
  • Cessna 190, 195,
  • Cessna 205, 206, 207
  • Cessna 210
  • Cessna 336, 337
  • MK20 Series
  • PA-24, PA-28, PA-28R, PA-44

In The Box

  • 2- O-rings
  • 1 packet of Seal Lube
  • Detailed instructions


The kit worked as advertised!!

John D
May 1, 2020

Exactly what I needed and it came with a special fuel resistant lubricant that is a must.

February 28, 2020

Just what I needed

Mark H
February 3, 2020

Makes the primer better than new. Owners and pilots are amazed that their primer works so well after I redo their primer with this kit. Many did not realize that their primer was so stiff, they thought it was supposed to be hard to push in and out.

Farnworth A
January 13, 2020

Easy to install and fixed the problem

Wayne C
December 1, 2019

1965 C 172 F. My primer was dry, rough, and wouldnât hold prime for start ups. 10 minute installation with this kit, and my primer worked like new again.

Jimmie D
October 5, 2019

This kit was exactly what I needed. For a couple of months, the primer in my C150 seemed to be doing less and less and eventually, it just stopped. The kit was simple enough, just two O-rings that restored the seal and now it works like it was supposed to work. The directions that came with the O-rings were perfect. Thanks

Mick M
August 31, 2019

Worked very well. Use a small pan (ie dish pan) underneath just in case it drips fuel when you remove the plunger.

Farnworth A
July 15, 2019

I used this kit to restore my primer. Took all of 10 minutes. An easy fix for an annoying problem. Primer is now as good as new.

Charles E
June 2, 2019

Simple and fast overhaul. Well worth it.

Larry H
February 10, 2019


Q: What are the dimensions of the o-rings in this Primer Overhaul Kit? I have a Lukenheimer primer on a Cessna 140.

The dims are as follows: 3/8" I.D. x 1/2" O.D. x 1/16" cross width of o-ring.

Q: FYI: I just measured the O-rings on an Essex primer. They are the same dimension as the O-rings in this kit.

Ok thank you for the information. We will post it for other customers.

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