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72 Eldorado fuel issue

Started by Lars Kneller 8246, August 24, 2025, 10:17:07 AM

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Lars Kneller 8246

The other day I turned left on to a street and gunned the engine. I went about 1/10 of a mile and it promptly stopped. It didn't appear to be getting any fuel. I cranked it for a while and then the battery wore down. Luckily, I wasn't too far from home and towed it home. It was in the 90's that day and I drove that car due to its good A/C. It did sit for a while at my first destination in a garage out of the sun. I have never had issues with vapor lock. The engine has about 1000 miles on it after a complete rebuild 12 years ago. We did up the CR to 10:1 then and put a little different cam in it, but it hadn't never failed me previously.  Now the car starts right up like nothing ever happened. A friend suggested that fuel somehow sloshed out of the carburetor when I turned the corner and flooded the engine. I am open to your thoughts and opinions. Thanks!

TJ Hopland

So after it died you cranked it till the battery died and there were no signs of life?  But you were not able to do any other testing like starting fluid or spark check?   Towed it home put the battery charger on it and several hours later it just started up like normal?  Or did it take some cranking?

There are some carbs that if out of adjustment or poorly modified could have a fuel slosh problem so its kinda of a thing but not on stock stuff and not on a quadrajet so I don't think that was it.

What was the level in the tank at the time?  And have to filled it since?  Perhaps its lower than you think and something has gone wrong with the gauge so its not giving you an accurate reading?  So the corner and acceleration sloshed the remaining gas away from the pickup and with the borderline vapor lock heat conditions it wasn't able to re prime?

Have you ever been inside the tank of this thing?  Maybe there is some crap in it and that corner acceleration move knocked it loose so it plugged up the inlet?

I think at the least I would put some gas in it just to make sure you have some in there and go buy a small can of starting fluid.  If it does it again even if you are alone you can shoot the fluid in and it should pop if its fuel that is missing.  Ideally you will have someone with you since starting fluid evaporates real quick on a hot engine.  If it doesn't pop on the fluid then you know electrical is the next thing to check. 
73 Eldo convert w/FiTech EFI, over 30 years of ownership and counting
Somewhat recently deceased daily drivers, 80 Eldo Diesel & 90 CDV
And other assorted stuff I keep buying for some reason

"Cadillac Kid" Greg Surfas 15364

Lars
I would suspect a weak fuel pump. Heat soaked fuel line building up vapor pressure that the pump cannot overcome. Happened to me
Cadillac Kid-Greg Surfas
Director Modified Chapter CLC
CLC #15364
66 Coupe deVille (now gone to the UK)
72 Eldo Cpe  (now cruising the sands in Quatar)
73 Coupe deVille
75 Coupe deElegance
76 Coupe deVille
79 Coupe de ville with "Paris" (pick up) option and 472 motor
514 inch motor now in '73-

Jeff Rosansky CLC #28373

One thing with these old cars that gets us is coincidence.
I had issues eith our 55 when it got warm that I had trouble figuring out until 1 day it did it just after I backed out if my driveway. Turns out it was a bad coil. Might just be worth running your hand under the coil to see if it's wet-- ours started leaking and that's how I found it.
Jeff Rose
CLC #28373
1970 Coupe DeVille (Big Red)
1955 Series 62 (Baby Blue)
Dad's new 1979 Coupe DeVille