Packard Forum Index » Pre-War (1899-1942)

OK all you expurts, here's todays clarification/interchange question on the single action pumps..
1940-47 6cyl fuel pump, common number 524.
1940-47 8cyl/120/282 fuel pump, common number 525.
1942-1947 Super8/356 fuel pump, common number 545.

Can someone tell me the FUNCTIONAL interchange, Hollander's or otherwise.
Yes, I know the arm on the 6cyl 524 pump is straight...so what...Nelson Bates swears on his brothers grave the 524 and 525 are interchangeable....as is the earlier 508 dual action pump thru the 110/120/160/180 line (clocking the inlet/outlets accordingly)...blah blah blah. which suggest what we all thought up until the question arose this morning that all 37-54 pumps were FUNCTIONALLY interchangeable. Still true?... or not, with emphasis on the single pumps noted above.

Thanks - we're all still learning.

From my own experience (in 1972), on a trip to CA the diaphragm broke on my double action pump in Santa Clara, Oregon, right, and gas went into my oil. I discovered this when I stopped for gas and checked the oil. Very full and very thin. I had a single action pump with me and with the help of the attendant and no help from me, he replaced it and I drove to Palo Alto.

Yes, I believe that all the single action pumps are functionally interchangeable.

The 6 cylinder pump is a Type AT so may have a different pumping capacity than the 8 cylinder ones but would still function for interchange.

Both of the 8 cylinder pumps are Type AH and identical except for clock position of the inlet/outlet.

Thank you Brian, you are always a trusted research resource. Basis of question was request from a 40-110 owner for a spare pump. Only core I had was a 525/545 and Terrill asked if I was aware the 110 pump had a different looking arm...

David,
Sorry for the late response, internet connectivity problems being my excuse!

Pic's are from a 1952 Hollanders, 18th Edition.

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FWIW here's a couple of excerpts from the 1962 AC Fuel Pump catalog.

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Thank you. All good information. The point of the question was to confirm the use of the Packard 8cyl AH style pump as a replacement for the Packard 6 cylinder AT - which I seem to be assured is fine - subject to the benefit(?) of the larger diaphragm in the 525/AH pump.