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Fuel Pump Diaphragm Material

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(@Bill Johnson)
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Need advice. I have some new Nitrile .060 material to make a fuel pump diaphragm. The old diaphragm appears to be about .050 thick. Is the new Nitrile material too thick ? Would it the pressure be more than the pump rocker arm could stand ?  Once the new diaphragm is peened or staked to the pump pull rod , it might be impossible to change the diaphragm and use the old pull rod . If this .060 material is too thick, can you recommend a source for the correct material ?
Thanks


 
Posted : 03/06/2021 8:12 am
(@adamb)
Posts: 320
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Why are you messing with the old diaphragm, and having to re-rivet it when new diaphragms for these common AC R type pumps are available?


 
Posted : 04/06/2021 4:10 pm
(@Bill Johnson)
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All kits I have found so far have only the diaphragm that has to be peened to the old pull rod. Plus it sells for $49.00 dollars which I think is a little too expensive for mainly the diaphragm. If you have a source for the AC 459 Type pump kits with the diaphragm attached to a new pull rod, please post. I am guessing most old single AC fuel pumps would probably use the same pull rod and diaphragm. Plus removing the old diaphragm from the pull rod and trying to save enough metal to re-peen is kinda tricky.
Please post source.
Thank you.


 
Posted : 04/06/2021 4:28 pm
(@adamb)
Posts: 320
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There's many sources out there, here's the only one I am going to search for on my time and dime: https://www.ecklers.com/fuel-pump-diaphragm-with-2-gaskets-ford-47-16873-1.html


 
Posted : 05/06/2021 10:52 am
(@Bill Johnson)
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Thanks for the info. It has a pull rod attached to the diaphragm and 1/3 the price of my source. Ordering one to compare to my original.
Thanks again,
Bill


 
Posted : 05/06/2021 11:53 am
 ok54
(@ok54)
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[b]I don't believe the Ford is the same as an AC diaphragm[/b]


 
Posted : 07/06/2021 12:53 am
(@Bill Johnson)
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I have ordered one and will compare it to the old AC diaphragm assy. Wil post my comparison when it arrives.


 
Posted : 07/06/2021 3:22 am
(@Bill Johnson)
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Comparison of the 1941 To 1948 Ford flathead diaphragm to the old AC type 459 single. The parts are very similar. The main difference is the bottom washer holding the diaphragm. The Ford is approx 1/2 inch larger diameter than the AC. This diaphragm assy fits into the old AC pump housing. I;m not sure if this difference will have much effect on the action of the pump ??
See attached comparison picture.


 
Posted : 08/06/2021 11:22 am
(@adamb)
Posts: 320
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The small difference in the bottom washer size makes no difference in pressure or flow, only the  changing the spring tension on the big spring that seats in the top washer would change the pressure. Should be just fine. Go ahead and put it together and test it out and report back.  K


 
Posted : 08/06/2021 1:38 pm

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