Scavenger Tube Needed?

[Rbyham]

I rebuilt the carb on a new to me 1966 A4 today. Pic shows finished product. Was pretty straight forward rebuild. Just real cruddy inside. My question is that there was no scavenger tube on the carb. You can see the plug on the top flange and the hole at the bottom throat is simply open. My research seems to say the scav is optional and it appears the PO felt no need of one. I would add that when I cleaned her up I noticed a heavy brown color at bottom of air intake throat. Looks like might have been some pooling fuel.

What do you think and is the scavener tube a part I go to Moyer for? Thanks.

[roadnsky]

Two for two

Same answer here as the other post...
Yes and yes.

http://www.moyermarine.com/cgi-bin/shopper.cgi?search=action&category=FCAR&keywords=all&template=Templates/B000_storebuilder.html

[roadnsky]

I should have pointed out that you want the tube because you don't want fuel pooling in the throat and leaking out that hole.
The scavenge tube reclaims and returns it to be burned.
There is also a good discussion about the scavenge tube here...

http://www.moyermarine.com/forums/showthread.php?t=6300&highlight=scavenge+tube

[High Hopes]

.... You can see the plug on the top flange ...

It looks like you have a spacer on top of your carburetor which might have been for a PCV valve. Not sure. I have a different set-up. The scavenger tube goes to the intake manifold, yes?

[roadnsky]

...The scavenger tube goes to the intake manifold, yes?

Normally it does unless you have the PCV setup which his pic suggests he does.
(I'm gonna go waaaay out on a limb here and bet Neil doesn't have a drawing for that)

In his case, however, he doesn't even have the tube.

[ndutton]

I'm gonna go waaaay out on a limb here and bet Neil doesn't have a drawing for that [PCV setup]

Oh, I've got one but it's pinned on the dart board and full of holes.

Please note that the scavenge tube is a USCG requirement and a VERY important safety item, one of the most important.

[Rbyham]

Yes I do have indigo Pcv upgrade. How does that impact the scavenger? The top plate is for the Pcv which connects on the back. The plug for the scavenge tube is on the front. Can both tunes connect to same plate? I am really curious why PO plugged the scav.

[ndutton]

Can both tubes connect to same plate?

Yes.

I am really curious why PO plugged the scav.

Because he's an . . . . uh, because he wasn't a member here. Had he been he'd have known better. What did your surveyor have to say about it?

[romantic comedy]

You might want to check for a possible air leak in the carb joint.

Put the smallest feeler gauge in between the carb halves, especially where there is that extra hole in the gasket. The newer carbs have a bolt there. We call them either 4 or 5 bolt carbs.

[roadnsky]

Yes I do have indigo Pcv upgrade. How does that impact the scavenger? The top plate is for the Pcv which connects on the back. The plug for the scavenge tube is on the front. Can both tunes connect to same plate? I am really curious why PO plugged the scav.

Ok Neil's gonna kill me but, here are a couple of pics of where the scavenge tube connects,,,

[ndutton]

I think I'm gonna report that post as obscene.

[Rbyham]

You might want to check for a possible air leak in the carb joint.

Put the smallest feeler gauge, in between the carb halves, especially where there is that extra hole in the gasket. The newer carbs have a bolt there. We call them either 4 or 5 bolt carbs.

I was aware that there are 2 versions in terms of screws. The only gasket i had was a 5 screw. I figured it would work. Are you saying the 4 screws always or tend to leak?
?

[Marian Claire]

http://www.moyermarine.com/forums/showthread.php?t=7091 Post #5. Is the port in the manifold open? Is that not a normal spot for scavenge tube? Dan S/V Marian Claire

[romantic comedy]

A lot of carbs have laeked. Mine is very bad, and i use goop to seal it. Some guys machine the surfaces. (file or sand paper)

I only know of the one gasket also. I just cut off the extra, makes no difference.

[Rbyham]

A lot of carbs have laeked. Mine is very bad, and i use goop twould require lots of choke to run. it. Some.. guys machine the surfacebest? I :-) file or sand paper)

I only know of the one gasket also. I just cut off the extra, makes no difference.

I may be able to do a test fire tomorrow and see if there is a leak. I am assuming any leak woulld require lots of choke to keep running... What kind of goop works best? :-)