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Allis Chalmers Discussion Forum
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Author  [Modern View]

05-07-2014 19:17:12

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I had the exact same issue with my 180 gas. diafram (YT won't let me use the correct spelling - it gets filtered as a bad word!) inside went bad and was leaking...and yes the AGCO pump was I think $170 or so. Allis had a habit of using fuel pumps similar but not exactly the same as ones in cars. So I searched and searched till I found what I thought looked like the closest match - Airtex 4459 - and bought one for about $50 and my local auto parts store. Look at the 3 photos below. Left side is original Allis fuel pump. Right is the Airtex 4459. So here's what I did:

1. Main issue was the diafram. Same except the pull rod slot for the cam lever is off by 1/12 turn if you look close at the photos. I was able to grab the metal center with 10" curved vice grips then turn the rod 1/12 turn so it lined up between holes instead of at a hole

2. Reuse both springs inside from original pump

3. Reuse bottom housing and lever from original pump

4. Install all new top valve from Airtex 4459 on original lower body. Move gas line fittings over from original pump. Use good gas rated teflon tape to seal fittings. Use new gasket between top and bottom housings.
5. Bolt on tractor using new mounting gasket and re-install lines.
Mine's been working 2 years now no problems and saved like $120. Hope this helps. Mike


This post was edited by Skyhighballoon(MO) at 19:26:29 05/07/14 2 times.

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