June 17, 2020 at 10:09 am #16963
Does anyone know of a good source for a fuel pump repair kit for a 63 Jetfire? I’ve seen the kits on eBay for the glass bowl version fuel pumps, perhaps they will work for the 3147 version as well?
KellyJune 17, 2020 at 4:28 pm #16964macf85Participant
I got a kit from Classic Preservation back in 2007 for my Cutlass. Still working great today. Also rebuilt the one in my ’62 Rambler about the same time and its still working great too, including the vacuum section. Made with materials compatible with fuels containing ethanol. All parts fit perfect. If the Jetfire pump is different from the Cutlass he probably has a kit for that too. Here’s the website if you want to contact him.
http://www.classicpreservation.com/fuelpumpkits.htmlJune 17, 2020 at 6:11 pm #16965jensenracing77Participant
I found on a couple pumps that the diaphragm is all that went bad and the diaphragms are the same in many of these pumps. An entire kit is always nice though.June 18, 2020 at 9:26 am #16971
The fuel pump I have works fine, but is off the car right now, so I figure it’s time for a little preventative maintenance on a 57 year old item. 🙂June 18, 2020 at 1:10 pm #16972
I contacted Hal at Classic Preservation. We identified what I need and have a kit on order. Thanks for the suggestion!
I do have a question. What is the function of the bulb shaped device that is plumbed into the inlet side of the fuel pump? Is it some sort of fuel surge chamber? I have attached a pic of it.
You must be logged in to access attached files.June 19, 2020 at 12:49 pm #16993macf85Participant
I’ve never seen anything like that on any mechanical fuel pump. Pressure regulators would be located on the outlet side in the line leading to the carburetor. It might be something that was added by a previous owner at some time during the life of your car. I have seen some goofy add-on devices in the backs of old magazines in the past. This might be one of those. Maybe one of the Jetfire owners might know if this is something specific to the Jetfire? Now I’m curious.June 19, 2020 at 12:55 pm #16994
I am certain it is OEM. If you look at figure 8-177 part C on page 544 (section 8-154) in the original 1963 Oldsmobile Service manual, you will see it illustrated.June 19, 2020 at 1:00 pm #16995
It’s certainly not a pressure regulator, As mentioned, I suspect it possibly supresses spikes in fuel pressure, much like an expansion tank in your home water plumbing.June 19, 2020 at 1:08 pm #16996
It is indeed unique to the 3147 Jetfires. Here is the image from the service manual.
You must be logged in to access attached files.June 19, 2020 at 4:54 pm #16998jensenracing77Participant
You are partly right. Not so much to prevent surge but to keep a continues forward motion of the fuel. I think this was on all cars with a return line in 62 and 63 but it could have been Jetfire only. I believe A/C cars would have had them but maybe not. It is called a fuel dome and needs to be pointed up so it don’t fill with fuel. On a normal system, the fuel will go, stop, go, stop, with the pulse of the diaphragm, this will absorb the forward motion and release it on the next “go”
I am not sure how effective it was but that is the reasoning behind it. Many of the pumps around 65 to the 80’s had the fuel dome built internal
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