Hipo Fuel Pump Question

Only 2 kind of button tops as far as I know.. the 3939S and 4201S

I really hate to show my ignorance to often but I need a clarification.

My car does not have an original HIPO fuel pump on yet (I, like many others, am searching). The 4th edition says the 65 HIPO fuel pump should be a 3939S. The picture of the 65 HIPO fuel pump in the book is not a push button top.

My question is; Is the 3939S pump that I need for my 65 fastback a push button pump, or does it look like the one in the picture on page 48 of the 4th edition?

The number :4399S is a button top double spring fuel pump also.

I don't think the 4th edition has a picture of the button top '65 pump. The transition to these happened sometime early in the production year.

I have a May 1965 3911S A-code, button top pump.

Does anyone know the date when the 3734 fuel pumps were replaced by the 3939S ?

I read this on a Q & A for a current eBay listing, don't know if it came from this group. But I'm ignorant so I'm wondering if it is accurate. I thought the early cars' screw-together pumps also came in a Hipo variety.

<BLOCKQUOTE id=quote><font size=1 face="Verdana" id=quote>quote:<hr height=1 noshade id=quote>Hi, the X on the fuel pump body does not mean it is a hipo, it only maens that this is the improved pump that makes less noise than the ones without the X. These pumps came into service in 1963. The H3 date code on your pump means it was built Aug 1963 and it fits 260-289 small block V8. There were NO special hipo pumps until 1965 when they came out with the crimp together pumps. What you have here is a 1964 260-289 pump most likely from a falcon/fairlane/galaxie.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana" size=2 id=quote>

Edited by - b9folk on 11/22/2006 22:29:30

This information is partially accurate. Based upon information from a Fuel pump rebuilder / restoration place outside Boston the 260/289 had the same pump numbers (several listed - sorry I didn't write them down) before '65 - but his books that old are limited. The "X" signified a "High Performance" pump - not to be confused with the "K" HiPo. The pumps were quieter, but the main difference was pumped volume and diaphram material type. The regular pumps back then used leather elements - which were easily broken down by racing gas and additives - so they began using the better neoprene elements for racing or performance pumps. Something very common now.

I have a screw together CARbureTER canister "X" pump date J4 and stamped 3908S - this was on my APRIL '65 K when purchased in 1979 - it has the extra spring and lever under the arm (for high RPM operation), but does not have a button top. It also had a FoMoCo rebuild sticker on it at that time. It is now restored and waiting for the remainder of the car.<img src=images/icon_smile_big.gif border=0 align=middle>

I'd love to find a correct button top pump - but this one will do and won't cost me a small fortune.

<BLOCKQUOTE id=quote><font size=1 face="Verdana" id=quote>quote:<hr height=1 noshade id=quote>

I read this on a Q & A for a current eBay listing, don't know if it came from this group. <hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana" size=2 id=quote>

[/quote]

How about posting the eBay auction number?

Gene,here is ebay# 180053343060 .

As far as I know, Ford replaced the screw together

fuel pump (same as on standard D-code 289 and 260)

with the crimped design 3939A in late August of 1964.

The 4th edition isn't really clear on this issue.

With reference to the question about 3911 above,

it was used in standard C and A code engines.

/Bo

To add to Bo's thread: Bob Mannel's book details all of the fuel pumps and explains the 3911 vs the 3939. If anyone is intereseted I can get pictures of both NOS pumps for comparison.

Not meaning to take issue with earlier statements with respect to the screwed versions, but I would be surprised if leather had been used in a high performance production fuel pump of that era.

No offense taken - re-read my post - that is exactly what I said.

Leather or similar material used in regular pumps - Neoprene in the performance pumps - at least according to the guy in Boston.

Ford TSB, section 9303, Article #7 dated 1/14/63, states in part, "New fuel pumps for the subject engines [221/260], to reduce objectionable noise levels, became effective in production approximately October, 1962 and are available for service. These fuel pumps may be identified by the letter 'X' cast on the diaphragm pull rod tower." The part number was C3AZ-9350-H.

The 289 HiPo was not listed in the application because it would be about another month before that engine became available. All the 1963-64 289 HiPos used the fuel pumps with the X. The X had nothing to do with high performance. All engines used the same pump. It had one spring under the lever. They were the screw-together-type.