Leaking 28 PCI - Solved

Snort · Posted: Thu May 05, 2011 7:40 pm Post subject: Leaking 28 PCI - Solved

Today I discovered a solution to a leaking 28 PCI which has baffled me for a long time.

Whenever you look for ideas on leaking carburetors here, the common solutions are fuel pressure, float valve, rebush throttle shaft.

Well the last one is really not a cause of leaking carburetors but rather more like a canary in the coal mine, where you can actually see that there is a problem somewhere, but worn throttle shafts do not cause fuel to leak, they show the results of a fuel leak just as a dead canary shows that you have a problem with the air you are breathing down in that mine, and you'd better get out quickly.

Fuel pressure and float valves are valid sources of leaks, but when you've eliminated those two problems, what can be left?

Emulsion tube housing. The emulsion tube housing is a press fit into the carburetor body. If you have a cracked or loose fitting emulsion tube housing, it can slowly drain the fuel from the float chamber until the level of the float chamber is equal to the height of the hole in the carb body where the housing fits.

Today I reset my emulsion tube housing using blue Locktite, hoping it would be strong enough to lock it in and seal the leak, and weak enough to allow removal down the road if I need it. Other suggestions are welcome.

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Mr Bubble Head · Posted: Tue May 10, 2011 4:45 am Post subject:

I'de change the float needle valve I bet its sticking every now and then, causeing fuel to feed into the carb under pressure from the weight of fuel in your tank

Flavio · Posted: Sun Mar 17, 2013 3:52 am Post subject:

Snort.
This thread has about two years old, but I'm interested about your result with the Blue Loctite at the emulsion tube housing .
Did it work ?
Thanks
Flavio

Snort · Posted: Sun Mar 17, 2013 5:57 am Post subject:

Blue loctite worked for a while but I changed it to Seal-All and that is still holding up. (Small yellow tube)

Flavio · Posted: Sun Mar 17, 2013 7:27 am Post subject:

Thanks for the information. I've never seen the Seal-all product over here... but I have a tube of Loctite 577 that is fuel proof. Will try it.

747frieghtdog · Posted: Wed Jul 10, 2013 2:41 pm Post subject:

How do you get to the emulsion tube. Isnt it buried in the cast tube?
_________________
55 Oval

747frieghtdog · Posted: Wed Jul 10, 2013 8:25 pm Post subject:

Figured it out....
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55 Oval

mr matt · Posted: Tue Dec 10, 2013 8:29 am Post subject:

when you are saying leaking, what do you mean? Is it my symptoms - If the car sits, say for a week ( could be a couple days) the engine has to crank over and over and over, to apparently fill the carb bowl, then the car starts... is this what you were experiencing?

Thanks

Matt

Snort · Posted: Tue Dec 10, 2013 8:50 am Post subject:

mr matt, I think you're experiencing fuel evaporation from your float chamber, but it could be exacerbated by a leak.

Typically, what I've experienced with a leaking emulsion tube is you drive until the motor is warm. Then you stop for 5-15 minutes. When you start the motor, it stumbles as it's flooded from the fuel flowing out of the float chamber and into the cylinders. In my case I could also smell the fuel as I walked by the rear of the car.

mr matt · Posted: Wed Dec 11, 2013 4:24 am Post subject:

Thanks, I do have a different issue. I know someone else who had the same problem as I did, sent his carb away to be rebuilt and no longer had the issue. Guess it is time for a rebuild, but especially wanted to focus in on the problem area that causes this.

Thanks again!

NikC · Posted: Tue Sep 30, 2014 11:52 am Post subject:

747frieghtdog · Posted: Tue Sep 30, 2014 1:44 pm Post subject:

henry roberts · Posted: Tue Sep 30, 2014 6:12 pm Post subject:

if you pull the air correction jet out, be gentle when you screw it back in. I might be unlucky but about 1/2 the PCI's I have, have cracks in the carrier from people over tightening the jet.

Captain · Posted: Sun Feb 15, 2015 2:37 pm Post subject:

I have a 28 pci that has the top of the tube broke because of over tightening. What can I do. Replace tube? Who sells the correst one? Thanks

Danwvw · Posted: Sun Feb 15, 2015 2:52 pm Post subject:

PICT 28's are a great little carb. I got some great gas Milage with mine even on a 1641cc sp with a W-100 cam it performed excellent! I would just find a used one check here on the samba or e-bay or cregs-list. I just found a whole bunch of 1600 DP Doghouse parts on Cregs List.
I think mine had this problem. The throttle shafts all leak but only when the car is stopped. That must be when the gas comes around. Could explain gas in the oil in cold weather too! Good to Know!
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

EverettB · Posted: Sun Feb 15, 2015 10:20 pm Post subject:

Strato56 · Posted: Wed Sep 21, 2016 9:16 pm Post subject:

ecallaway · Posted: Mon Jun 22, 2020 7:49 pm Post subject:

ecallaway · Posted: Mon Jun 22, 2020 8:46 pm Post subject:

Snort · Posted: Tue Jun 23, 2020 10:59 am Post subject: Re: Leaking 28 PCI - Solved


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