Hi everybody. Meanwhile I put in an electrical pump for 28 bucks just to drive the car and it works perfect. Now the mechanical pump is fixed for about 33 bucks (for a sheet of diaphragm material). Here are some pics. And the working hours.......ok, but I wanted to rescue this little piece of American history.

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I went through like 3 brand new fuel pumps on my 64 soon after installing them, they would start leaking gas into the oil sump. One lasted about 6 months and it suddenly died on me while driving to a car show.

Well, the 4th one was a charm, and it hasn't leaked gas outside the housing or in the oil sump since I replaced it last year. The quality of some of the replacement parts these days are garbage, it's a hit or miss when it comes mechanical pumps, it's nice that at least they are rebuildable and are fairly easy to fix. 

Chris, What brand and part # were the 3 pumps that failed and 1 pump that did not fail? Also were they the original 3 piece style like the on the left in picture below, or the aftermarket uni-body style like the one on the right? For several years I stocked and sold the Spectra Premium B1297MP and have used for over a decade in my person 64 CDV with excellent results.

Jason, I got the spectra premium pump from Autozone. But immediately after installing one, fuel was seeping out the top of the housing. So I returned it the next day for a replacement, and so far I haven't  had any issues with it.

Chris, So that is fuel pumps #'s 3 and 4. What about the 1st 2 fuel pumps? ps. I have tried several times (including today) to order the Spectra fuel pump from Auto Zone and they indicate they are out.

Jason, I don't think you can get the fuel pumps anymore, they had to special order mine last year directly from the company when I got the replacement under warranty. But it only took a day or 2 through FedEx.

Remember, my engine is from a 65, so the pumps inlet pipe is positioned differently from a 64 429. Plus if I use a 64 pump, I would have to turn the housing to allow clearance for the pipe because it hits the engine block and won't line up properly in the housing unless I turn the housing. I've done this before not knowing at the time my engine was a 65, and the pump worked fine, it just didn't last.

The first 2 that failed was from O'Reilly auto parts. One of the pumps inlet pipe was loose and wasn't allowing vacuum to suck fuel into the carb, so I returned it (poor workmanship). The other one dumped gas into the oil, as the diaphragm blew when the pump outright failed on the way to the show.

The 3rd one was the Spectra Premium brand that was leaking gas from the top of the housing. The car was drivable, it just was seeping fuel ever so slightly so I returned it and got the replacement which has been perfectly fine so far. 

It's been almost 8 months now and the pump is problem free.

I think the company is not making these pumps anymore, so I suggest to everyone to hold onto whatever spares you have left and just rebuild them if you can for the future. 

Chris, thanks for the detailed reply. I will continue to look around for the Spectra pumps. I have a large bin of used fuel pumps, and probably a dozen original style, maybe I can rebuild later on or find a reputable source to rebuild.

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