ok my caddy has been parked for like 7 years ok i start it up a year ago ran fine ok today i put a newer carb on it and now it wont stay started fuel is shooting out of the carb and after car is turned off smoke comes out of the carb and it always does a engine run on what do i do? and how many fuel pumps are on a 1969 cadillac eldorado

There is one fuel pump on a 472 engine but I don't think the fuel pump is the problem. It sounds more like your replacement carb is bad. Did the car act the same with the original carb? It could also be a vacuum leak or sticky intake valve.

There is one fuel pump on a 472 engine but I don't think the fuel pump is the problem. It sounds more like your replacement carb is bad. Did the car act the same with the original carb? It could also be a vacuum leak or sticky intake valve.
ok i found anther fuel pump back by the gas tank and there is on up in there motor wtf? and with the original carb it ran great but with his carb its not running great but i just put another carb on the car that my friend had same thing happend and sticky intake vavle??

There should not be another fuel pump unless you have EFI, in which case it would be in-tank. Are you sure it's a fuel pump you saw?

There should not be another fuel pump unless you have EFI, in which case it would be in-tank. Are you sure it's a fuel pump you saw?
here is a pic of it

^^And what I'm seeing under the inlet or outlet on the left side is an electrical connection? Hmm.

Anyway if fuel is shooting out of the carb it sounds like the float is adjusted too high. I had a similar thing happen on a Holley carb I was running, my friend adjusted the float the wrong way and we got a geyser of gasoline under the hood... good times.

I would say that looks like a filter, but the connection has got me as well. Is the mechanical fuel pump up front still there?

Electric fuel pumps develop much higher pressure than the old mechanical types. Carbs were designed for about 5 to 6 psi, not much more. That electric pump could give you around 40 psi. If you want to use the electric pump then you will need a pressure regulator.

69 wasn't FI. That must be an add on pump. It may have been out on if the mechanical pump wasn't putting out enough fuel. Sometimes they get weak and work OK in normal driving but don't have enough flow for WOT,or the stock pump may have gone bad and that was someone's fix.

If you aren't going to drive it hard I wouldn't bother with an electric pump. Take off and get a fuel pressure gauge ( less than $15 @ Harbor Freight )to check the mechanical pump. If it's low, like 2-3 psi, put a new mechanical pump on. Or...just put a new mechanical pump on. It has been sitting for years and probably is weak.

69 wasn't FI. That must be an add on pump. It may have been out on if the mechanical pump wasn't putting out enough fuel. Sometimes they get weak and work OK in normal driving but don't have enough flow for WOT,or the stock pump may have gone bad and that was someone's fix.

If you aren't going to drive it hard I wouldn't bother with an electric pump. Take off and get a fuel pressure gauge ( less than $15 @ Harbor Freight )to check the mechanical pump. If it's low, like 2-3 psi, put a new mechanical pump on. Or...just put a new mechanical pump on. It has been sitting for years and probably is weak.
a year ago i put a new mechanical pump andwas only ran for like 20 min so should i just go buy a new carb?

a year ago i put a new mechanical pump andwas only ran for like 20 min so should i just go buy a new carb?

You have to make sure the fuel pressure is correct first. If it's too high it'll blow right through the carb. Have you tried it without the electric pump?

Did I understand that you already tried another carb (friend's) and it did the same thing? With or without the elec pump on it?

You have to make sure the fuel pressure is correct first. If it's too high it'll blow right through the carb. Have you tried it without the electric pump?

Did I understand that you already tried another carb (friend's) and it did the same thing? With or without the elec pump on it?
ok the elec pump has been off this whole time cause it wouldnt stay started with it on and i did try another carb of my friends that use to be on a 75 cadillac and it did the same thing

ok went out and started it up again to see maybe if it would stay running well it did for 5min 2min later a girls walks up ans says thanks for messing up my tuesday cause of my car being so loud she couldnt hear her tv so she started to say something to i just revved it she walked away and then here comes that fuel out of the carb so that was gay but she called the cops on me and the cop said i can only run my car from 7 in the morning to 7 at night im only running open exhaust like its that loud LOL

Forget the elec pump. Leave it off.

I'd get the gauge and check the pressure. it should stay about 5psi. I think 7psi is the highest a carb can handle.

If it's in the right range then get another carb.

Did you buy that one rebuilt? Why not return it?

You said it ran with the stock carb. Why not use the stock one?

Rebuilding carbs isn't that hard but there are a bunch of small parts. If you have an extra carb now maybe you should try rebuilding it.

Forget the elec pump. Leave it off.

I'd get the gauge and check the pressure. it should stay about 5psi. I think 7psi is the highest a carb can handle.

If it's in the right range then get another carb.

Did you buy that one rebuilt? Why not return it?

You said it ran with the stock carb. Why not use the stock one?

Rebuilding carbs isn't that hard but there are a bunch of small parts. If you have an extra carb now maybe you should try rebuilding it.
no i got another carb off my part car its 69 eldorado to it was was rebuilt like 20 years ago the the stock one rite where the fuel line goes in the carb it start to leak there so thats why i put this carb on and where would i get this gauge

i know what this is its a fuel sending unit anyone with a 1968-1970 cadillac eldorado go look on the passenger side rear tire by the gas tank and look and see of one of these are on there

For carb's you should get the vac gauge/pressure gauge. It's about $10-15. You didn't put a location in...auto parts store, Checker, Azone, wherever.


Leaking at the connection was common. Look at the threads. If they are good you should be able to get it to seal. If they are messed up I think there was an adapter to fix that. You'll have to check with an auto parts to see what's available.

yea i might go get that for this car doing this makes me want to sale it

i took the carb to a carb guy and hey looked at the carb and said it whs shit so im just going to get a new carb i found one at autozone for $148 should i just go get that one?

Not until you check the fuel pressure first.

Good luck.

Check the fuel pressure first thing, it's not that hard, it's not that expensive.

If you determine you need a new carb, send one of the Quadrajets you have to be rebuilt by a reputable carb shop. A $148 carb is probably going to be a POS, maybe not, but yeah probably. A quality rebuild on a Quadrajet may cost more but that will net you the best possible performance and fuel economy.

Azone's guarantee is good. You have to check the pressure or you are wasting everyone's time.

ok im going to buy a carb anyways cause this rusty sh*t carb i have it gay and falling apart so the carb from autozone for $148 will be ok rite?

Check the pressure first.

Check the pressure first.
im going to but no matter what im going to get a new carb

If anyone says Azone rebuilt parts aren't that great I won't argue with them, but their guarantee is great and a carb is pretty easy to change so I'd say go with Azone.

Even with their computer set up SAVE YOUR RECIEPT. I recently had a part go bad and they couldn't find it in the computer. I found the reciept and with that they found it. It was entered wrong and I didn't notice it when the guy did it.

ok there is like a big build up of black sh*t in the intake manifold so should i take it off and soak it in gas or some thing?

ok there is like a big build up of black sh*t in the intake manifold so should i take it off and soak it in gas or some thing?

Kerosene works well.

ok what kind of gasket is on there?

There's a metal "gasket" that's called the valley pan below the intake manifolds that seals oil in the lifter valley and seals the intake manifold to the heads. Regular carb gasket under the carb.

ok thusday going to take off intake manifold and go order new champion carb from autozone for $148 and spark plugs and wires so i hope my car runs good

I hope so as well. I still reccomend against the autozone carb. You will likely need to tune it, most off the shelf carbs are designed for the mainstream Chevy and Ford small blocks. On a Cadillac Big Block the carb will see a much more "sharp" vacuum signal. I can almost guarantee it will run rich out of the box.

I hope so as well. I still reccomend against the autozone carb. You will likely need to tune it, most off the shelf carbs are designed for the mainstream Chevy and Ford small blocks. On a Cadillac Big Block the carb will see a much more "sharp" vacuum signal. I can almost guarantee it will run rich out of the box.

ok how would i tune the carb?

Heh. A Champion carb? Hell if I know. Hope it comes with instructions...