I have heard that the fuel pumps going onto our Cadillacs are not lasting.  Has anyone taken theirs apart to see what they find wrong. I had to change the fuel pumpp on my 63 Sedan, and the pump was not that old. I took the pump apart, and found one of the valves had come loose, as it was not staked in place. I had a rebuild kit, and the instructions state to stake it in place. Even the service manual sais to stake the new valves in, when rebuilding a pump.  The new pump that failed, did not have the valves staked in place.

So if you have a bad fuel pump, take the bottom off, and see if there is a loose valve.

I may add these to my rebuilt items list.

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Comment by Tony and Ginny 429 on August 6, 2018 at 10:35am

Thanks for the explination to --stake the fuel pump valves
I had an idea it could be done with a punch but was not sure that was it --in this case

I think using epoxy could be a better long term hold and fix to keep the valves in place
My compliments on this fuel pump repair break thru that many here will benefit from in the future and mostly stop our cars from braking down due to less than great replacement part
One less reason to get stuck out on the road --works for me
This is really a great find for many of us here
I think this deserves the -----GOLDEN THERMOSTAT AWARD --- for excellence in classic Antique Cadillac Repair

David -- You are that man !!!
Congradulations on your great discovery my friend making ALL our Cadillac driving lives better

I think it is important to know the fuel pump you are repairing is an ---AIR-TECH--- as i do not think you can open all fuel pumps to get to the valves as they are sealed closed
This tread made my -- day better


Comment by Jason Edge on August 6, 2018 at 7:19am

Great info here. I put a link to this thread on our Help Page and labeled as - Fuel Pump Problem - Valves Not Staked in Place

Comment by David Thomas on August 5, 2018 at 9:32pm

Tony, to stake a pressed in seal, valve,etc. Take a pointed punch, put it on the edge of the hole the part is pressed into and lightly tap the punch with a hammer to deform the edge of the hole just enough to keep the valve from easily working back out. Do this on opposite sides so the valve will stay seated in its bore. You make a slight burr on the edge of the hole. HTH. David

Comment by Tony and Ginny 429 on August 5, 2018 at 9:15pm
With the many issues --many have with short lived mechanical fuel pumps -- this is a really big break thru on the subject
See what we can get done with some help from our genius mechanical Classic Antique Cadillac Friends --- Bravo !!!!!

Comment by Tony and Ginny 429 on August 5, 2018 at 9:06pm
Real good to find a problem that can be corrected and repaired to bring back the reliability that SB there to begin with
Real Nice work David and Russ
We might now get our mechanical fuel pumps and prevent them from being short lived from now on
I like this stuff guys !!

Comment by Tony and Ginny 429 on August 5, 2018 at 8:57pm

How does one stake a fuel pump valve
Term is new to me

Comment by Russ Austin on August 5, 2018 at 8:33pm

Just stake the valve back into place. Manufacturers are cutting costs at the expense of reliability.  Those should be staked in place.

Comment by Tony and Ginny 429 on August 5, 2018 at 8:00pm

you can use Epoxy as a bonding agent in a gasoiline environment if that help keep the valves in place for you

Not sure what is normally used to stake the valves in place
Not familar with the term stake as it is used with fuel pumps

Comment by Tony and Ginny 429 on August 5, 2018 at 6:13pm


looks like you found your problem 

Is the old pump repairable ?


Comment by David Thomas on August 5, 2018 at 3:11pm

Took the pump bottom cover off, the inlet valve fell out of the valve body cavity. It was not staked in, nor is the outlet valve.


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