M38 fuel pump modification

wesk · Posted: Tue Apr 12, 2022 11:02 am Post subject:

The damage that can be done is currently unknown. Probably because you have the first AC fuel pump I have ever seen without the last four digits of it's part number on the flange. If I was in your shoes I would carefully compare the behavior of both of your fuel pumps with the two different arms installed while not bolted to the engine. Specifically the results of different travel limits of the two arms and their associated linkage internal to each pump. I seem to recall a very significant difference in the angles of those two arms. Does the troubled pump have the AC trade markings on it?
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

horse · Posted: Tue Apr 12, 2022 12:44 pm Post subject:

Yes it is a perfect copy of the one in your photo with all the AC markings but no serial number. It has a manual primer lever also.
As you said there is a significant difference in the angle of the two arms especially the foot which can be seen in the link with the article on rebuilding the pump in the downloads.
In the M38 reference guide page 65 there is a good photo of both.
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1952 M38

wesk · Posted: Tue Apr 12, 2022 7:48 pm Post subject:

If it is a complete correct parts M38A1 manual hand pump style pump then it may be safe to assume it should use the late lever 5593764.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

horse · Posted: Wed Apr 13, 2022 12:07 am Post subject:

Thanks for confirming that. I will get the parts on order and go from there.
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1952 M38

horse · Posted: Sat Apr 23, 2022 12:53 am Post subject:

I have now received the new arm 5593764 also pin bush and other associated parts to fit the pump arm.

I have looked through the rebuild manuals and not sure if you can just replace the arm without splitting the pump completely.

Has any body done this swap and would confirm wether you need to open the full pump or not?

Thanks.

Jonathan
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1952 M38


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