Quadrajet Carb Leaking?

What paulj2 says rings a bell. It's been a long time but I think they also made a rubber block (?) type thing to do what he is saying. They were know for fuel leaks.

MountainAir05 wrote:
Here is a on-line manual, I also have a Chevrolet full manual if needed. After looking at the on-line manuals, you want need anything else except the tools.


http://www.carburetor-blog.com/free-carburetor-repair-manuals/

Awesome! Thanks!

justlou wrote:

turbojimmy wrote:
I bought a remanufactured Q-Jet for my motorhome

Doesn't it have a Warranty?

Yes, but I figured if it was something simple I'd just fix it myself.

It's not blowby because I don't have the PCV going into the air cleaner. I'm pretty sure it's fuel.

But now I've got bigger problems.

I couldn't get the choke stove plate to seal. I converted it to an electric choke so I don't use the stove - there's just a plate there. Well my eyes aren't what they once were and the leak isn't the seal - there's a hole tapped into the plate! Easy fix - it's 3/16. I couldn't get at it with the carb in place, but rather than remove the carb I figured I'd just remove the choke stove housing. I did and a little piece of metal on the end of the rod that actuates the choke fell down inside the carb. So I had to take the carb off and turn it upside down to get it out. I put it all back together on the work bench.

I put the carb back on and noticed that the throttle lever offered no resistance. Previously there was a little spring action, presumably from the accelerator pump. Well, the accelerator pump rod is collapsed. I dunno what happened. I had hoped that once it filled with fuel that it would return to its normal position. I unhooked the distributor so there would be no fire and cranked. Fuel is POURING into the intake.

So it's all messed up now, and I'm pretty sure I've voided any sort of warranty.

But I did seal that hole in the choke stove plate.

Grrrrr...I guess I'll start by taking it off again. I think the top half will have to come off to see what's happening with the accelerator pump.

Anyway - thanks for the tips. It sounds like maybe I need to epoxy it. I've read a couple of things on the 'Net about that. Thankfully my next trip is over a month away so I have some time to sort it out.

Here is a on-line manual, I also have a Chevrolet full manual if needed. After looking at the on-line manuals, you want need anything else except the tools.


http://www.carburetor-blog.com/free-carburetor-repair-manuals/

turbojimmy wrote:
I bought a remanufactured Q-Jet for my motorhome

Doesn't it have a Warranty?

Actually the arrow is pointing to the secondary needles that are used only at near full throttle. Primary needles are inside center near the float and vacuum piston operated. Fuel leakage into the secondary well was quite common on early models and corrected on the later ones.
The fix is to disassemble the main bowel from the base and epoxy the fuel well seams. They are "staked" into place at the factory but they sometimes leaked.
You had to put a bead of epoxy on the folder over staked, circular area that leaked. They used to sell a repair kit with a triangular shaped foam pad thing that was supposed to help with the problem but epoxy was the real cure.

How about a photo of the underside of the bowl
Btc

turbojimmy,
I'm certainly no expert on these things but, I have had a few Q-Jets apart in my time. I personally think they're one of the best carbs ever designed. Many have had issues with them but, if properly put together and adjusted, they're designed to work in a maximum range of fuel/air/throttle positions. With that being said, of course as you'd know, the two main reasons for ANY fuel OUTSIDE it's normal working area INSIDE THE BOWL, is due to a bad or broken gasket or, an improperly adjusted float or, a malfunctioning float and or, a possible micro-piece of dirt or debris in the needle/seat area.

Taking those Q-Jets apart is a tiny feat. Your arrow is pointing right at the main metering rods. They typically lift as the throttle is opened and, if you've never seen them, they're "stepped". The more throttle is use, the smaller the steps are as the higher they're lifted by the movement of the main and secondary throttle plates.

But as for your particular area for your fuel, I'm wondering, is it possible that your accumulating "oil" from possible blow-by? Again, it's only been a zillion years since I messed with those. Good luck.
Scott