My new Weber is LEAKING!

Do you like to go fast? Well get out of that stocker and build a hipo motor for your VW. Come here to talk with others who like to drive fast.
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vwfanaticboy
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My new Weber is LEAKING!

Post by vwfanaticboy »

Okay. For those of you who haven't read this part already, my purple chop top suffered an engine fire a while back (its 14th mile on its maiden voyage). It seemed to start at the right side weber 44 idf.

I took the carb off and it was leaking gas a little bit out of the idle jet. I still don't know why it was doing that.

So I got a new Weber 44 IDF and jetted it to match what the old one was jetted with. I pre-set everything as best I could and I reassembled the engine. I still need to really tweek the carbs out for them to be running their absolute best, but for now I'm concentrating on a different problem.

On the new carb, one of the accelerator pump jets is leaking fuel a little bit. If I shut the motor off and let the car sit for a while, and then go and check on it a minute or two later...there is a pool of fuel on top of the butterfly in one of the barrels of the carb. Its just the one barrel of the one carb, which happens to be replacing a carb that was leaking fuel before (out of a different hole).

I really want to figure out what is going on here.


More info: I'm running an electric fuel pump (facet solid state). But the carb leaks fuel after the pump is shut off and is no longer forcing any fuel to the carb. The carb leaks fuel without the pump pumping.

I need Your HELP!

Logan
mharney
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My new Weber is LEAKING!

Post by mharney »

What's your float level set to?



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vwfanaticboy
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My new Weber is LEAKING!

Post by vwfanaticboy »

I didn't do anything to the float level.

So I guess its set to whatever the carb came with it set to.

You have a very good point. Why hadn't I checked the float level?

However, would this account for the fact that one of the jets is leaking but not the other. Maybe its just a slight different tolerence between the two.

Thanks

Logan.
mharney
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My new Weber is LEAKING!

Post by mharney »

Yes it could. If the carburetor is not sitting perfectly level, it could.

Also if your facet pump has high pressure, and you don't have a regulator, that could be a problem.

My carbs out of the box were WAY off on float level, by about 4 mm! And my carbs were filthy inside. Got some help from John@aircooled. He rules.

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My new Weber is LEAKING!

Post by vwfanaticboy »

Hey...thanks for all of this help. What is the procedure to correctly setting the float level of these carbs.

I might just want to check that pretty soon.

Logan
mharney
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My new Weber is LEAKING!

Post by mharney »

It's hard to set without understanding by being shown, since it is hard to describe, so I am going to steal a picture (God help me).

Below is the diagram on the float level. I suggest that you make it closer to about 11 to 11.5mm if you can.

To get it right you might try turning the top on it's side so you can swing the float freely like a door. The adjustment for the height must be done by JUST letting the tang touch the ball in the needle assembly. Don't let it compress the ball.

The height is important as well as the drop, so take your time.

Image

Good luck!

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My new Weber is LEAKING!

Post by vwfanaticboy »

Thank you very much mharney. I do have the weber book and I have that picture but I had no idea how to use it. That was a great help.

I took the carb apart and checked the float settings. The closed setting was right on. However the total travel of the float was about 12mm instead of 32. I fixed that, but that wouldn't explain why the bowl would overflow. I was thinking that maybe the float inlet valve or something was sticking so I switched the entire float assembly out for another one off of a spare carburator I have (the one that caught on fire...but the top was just fine).

I just unscrewed the top section of the carb and replaced it. Then I ran around in the car a bit and parked it to see what it was doing. It was pouring fuel down the barrel at an alarming rate. The float was set perfectly. I had switched out the pump jet and I had changed the float assembly itself. But the thing is still doing it. I checked and noticed that the gasket around the float assembly was saturated in fuel. This must mean that the float bowl was completely full (way too full).

Also, when I had the top off of the carburator, I filled the float bowl all the way up with fuel. Well beyond the point it should fill up to. I was just doing this to see what happens when the bowl fills up too much. When I did this, it immediately started leaking fuel out of the pump jets.

My conclusion so far has been that obviously to cause the problem I keep having, the float bowl must be over-filling. It seems like it has been filling too much by the looks of the gasket around the float assembly.

I tried blowing into the inlet on the carb top while fiddling with the float. It seems to be shutting off just fine. However, my blowing was causing a very very slight pressure downward on the float itself. This means that if my fuel pressure is too high, it could force the float down and force more fuel into the carb that shouldn't be there. This all seems pretty logical so far.

I'm now looking for a fuel pressure regulator to hopefully actually solve my problems.

Thanks.

Logan
mharney
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My new Weber is LEAKING!

Post by mharney »

Good idea on the pressure regulator. I just sold a decent one on ebay or I would offer it to you. Sorry.

IDF's don't dig a lot of excess pressure and will overfill of you get too much going to them. I don't know anything about the Facet pump. Most local auto parts stores have the round top kind that you twist to the pressure you need. Prices vary.

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MASSIVE TYPE IV
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My new Weber is LEAKING!

Post by MASSIVE TYPE IV »

I ahve had them leak from the float bowls on several occasions right out of the box....
mharney
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My new Weber is LEAKING!

Post by mharney »

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by MASSIVE TYPE IV:
I ahve had them leak from the float bowls on several occasions right out of the box....<HR></BLOCKQUOTE>

Sup Jakester. What was the cause?

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vwfanaticboy
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My new Weber is LEAKING!

Post by vwfanaticboy »

After I get a regulator, I'll see if it continues to happen anyway. I'll just have to shoot myself if that doesn't fix it.

After the first carb burst into flames and kind of melted itself, I realized I needed to buy a new one. If the new one is leaking and its the carburators fault, then WTF! This car just wants to burn itself to the ground. Its tried to do it four times now.

It seems kind of odd that I am having absolutely no problem with the left side carburator. In theory they should be the same. They are receiving the same pressure from the same pump, so why would one leak and not the other?

This is the kind of crap that makes me want to quit this hobby and sell the bleeping car before I spend another 3 1/2 years of my life on it.


Logan
mharney
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My new Weber is LEAKING!

Post by mharney »

Logan, realize that my suggestions are assuming that everything else about the carb is ok, such as the needle and seat being ok, the seal of the carb top being ok, etc.. - I don't want to suggest that you go spending money unless you know the rest is right.

--Mark

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vwfanaticboy
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My new Weber is LEAKING!

Post by vwfanaticboy »

I understant that without you being here with my car and my engine and carburator, nobody could possibly know exactly what is going on. But I do appreciate all of the input you have been giving me. I've been eliminating possibly causes of my problem and I guess it has been narrowed down to too high of fuel pressure or a crappy carb. I was just saying that if I have a crappy carb, I'm gonna be pissed because this would be the second one in a row.

Is there anything wrong with the conclusions I have made on the float bowl filling up? I'm still not too sure.

I'll write back as soon as I have figured out anything else.

Thanks

Logan
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vwfanaticboy
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My new Weber is LEAKING!

Post by vwfanaticboy »

Today its sunny and warm.

Tomorrow its gonna rain.


So what exactly brings you to Carmel sometimes?

Definitely let me know next time you come here and I'll arrange meeting with ya.

Logan
melbatoast
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My new Weber is LEAKING!

Post by melbatoast »

your conclusions with the fuel pressure being too high and forcing the float down into the fuel is correct.

how is the weather over there in carmel? i haven't been over there in a few months. :~)



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arlan
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you see these?
they are my carkeys.
you will never get these.
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