Carb /Engine Issue: Taking it out tomorrow (a little scared)

[70_Steve]

Tried every end of the spectrum but too much gas is still getting into the carb and engine. Don't have a pressure gauge. Am I missing something about the FPR?

Usually someone would install a fuel pressure regulator so they can regulate the fuel to a particular pressure. Without a gauge you don't know what pressure the fuel is being regulated to.

Regardless of what the problem turns out to be, you may want to keep that fuel pressure regulator. The Edelbrock Performer (AKA Carter AFB) is one of the worst carbs to run off-road, if you run off-camber or nose-up and nose-down. I've got a write-up (bunch of posts I copied off of Pirate 4x4) that detail how to modify the carb. It will never run great off-road, but it will run better. PM me an email address if you're interested.

 

[carmi]

Check your PCV valve. Could be bad and allowing oil into the intake. Make sure you have not overfilled you oil.

 

[ObscureMachine]

installed a fuel pressure gauge (connected to the pressure regulator). Set the pressure at 4psi. With the pump on and the engine not running, gas was still running down into the intake from the carb. It was also coming up through some of the screw holes on the top of the carb. So, apparently the needles and seats are not stopping the flow of gas going into the carb. I went ahead and bought a rebuild kit and am gonna pull the carb in a few minutes and tear it apart.

 

[Justafordguy]

If you only have 4psi to the carb and it's still leaking in, it has to be the float, needle, or seat that's the problem.

 

[73azbronco]

or a cracked housing in the carb.

white smoke is oil or water.

Do you have acess to a radiator cap/coolant system pressure checker? They are free at Autozone for a deposit.

 

[Airmapper]

I had issues with my 1406 when I got my '70 as the PO had somehow gotten it filthy inside. I took the top off and cleaned the needles, but I didn't get it all and it still wanted to flood and burble and boil.

Only when I pulled it off for a full rebuild did I see just how much junk was in it. That was my problem, along with the floats being wayyy off.

Is your fuel clean? I assume you have a filter just before the carb? I have a clear one which is handy for a quick look at what is going on in there. Any little grit in there is going to prop the needles open.

Good luck, I've had great luck so far with my Edelbrock, it's a great running carb, off road excluded, but I'm going to experiment with that just for fun before I go to something else.

 

[ObscureMachine]

So, when you have to much fuel pressure, and your needles and seats need to be replaced, and gas is trickling down into your engine, apparently mucho gas will end up in your oil pan. Don't ask me how I know.

 

[broncnaz]

Well as long as you didnt have to call the fire department I wont ask. but yes typically when the carb is flooding out you will get gas in your oil.

 

[graniteguy]

I'm gonna ask how you know. Did you check the dipstick and it was extra extra full?

 

[ObscureMachine]

I'm gonna ask how you know. Did you check the dipstick and it was extra extra full?

Let's say yes. %)

 

[Justafordguy]

So did you get your carb flooding problem fixed?

 

[ObscureMachine]

I believe so, but as I said, it ran out of gas. So, I wasn't able to play with and tweak it to be sure. But I believe so. It ran great. When I opened up the idle mixture, some smoke came out (like before) but not that much and it didn't smell horrifically of fumes.

I'm going to get some more gas in a few minutes. so, we'll see!

 

[ObscureMachine]

OH. MY. GOSH!!! I'm losing my mind!!!

Started. Ran. Smoking and fumes again, after a few minutes it starts running rough, then dies. Just rebuilt the carb and it's doing the same thing. Fuel pressure is at 4psi. After I shut it off, fuel is still leaking down into the intake. It's also leaking from what I guess is secondary throttle linkage (see pic)

I guess I'll try adjusting my floats again (lowering). Not sure if that will help the leak at the linkage. Thoughts?



[YOUTUBE]X0kIKosKT2g&feature=plcp[/YOUTUBE]

 

[70_Steve]

OH. MY. GOSH!!! I'm losing my mind!!!

Been there done that. Highly overrated!!!

I guess I'll try adjusting my floats again (lowering). Not sure if that will help the leak at the linkage. Thoughts?

Pull the top of the carb off. Attached a couple foot length of hose to the fuel connection, and attach it to something so it's up in the air. Set the top of the carb on something else so it's resting on the floats (needle valves closed) Fill the hose with water (safer than gas) and see if you get leakage.

 

[Skiddy]

I am starting to think option D

 

[ObscureMachine]

Pull the top of the carb off. Attached a couple foot length of hose to the fuel connection, and attach it to something so it's up in the air. Set the top of the carb on something else so it's resting on the floats (needle valves closed) Fill the hose with water (safer than gas) and see if you get leakage.

Tried this. Only had about a foot of hose, but both sides dripped. I'm guessing with real pressure gas is shooting in, more than just dripping.

So, I just replaced both needles and seats, so I'm guessing it's not that since it's done the same thing before and after. I'm onna play with the floats and see if they are pushing the needles up far enough. How's that sound?

 

[ObscureMachine]

After checking out some photos, and looking at my floats, I realized there was a difference in the angle of the float connection (see pic: Red lines are what I've seen in other floats). So, tweaked the floats until the angle matched, and then the floats were all adjusted properly. I'll put it back together after I eat something and see what happens.

Tell me I'm a genius and this will fix it!

 

[70_Steve]

Tell me I'm a genius and this will fix it!

You're a genius!!!%)


;D

Edit: By the drawing in the Edelbrock Performer Owners Manual it looks like the top of the float should be parallel with the underside of the carb top. If yours isn't parallel, maybe there's not enough force applied to the needle...

Edit #2: Try setting the float level to 1/2", instead of 7/16"

Edit #3: The floats are empty, aren't they? You shouldn't hear anything splashing around if you shake them.

 

[Airmapper]

<Crosses fingers>

The tab on the back sets drop I think, and the bowl arm sets float level. (I think.)

 

[jim3326]

Looking at the pic it looks like the needle is in backwards. Is that the rubber tip against the float?

Jim W.