Car stalling at stops

[Old n' slow]

About the fuel pressure.....I didn't realize ( and didn't read my Bently shop manual carefully enough) that the engine needs less than 3 psi @ 3000rpm, most aftermarket pumps put out about 6-7 psi.....way too much pressure for the float shut off valve, flooding the carb and causing it to occasionally stall.
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Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;

1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel .

[static337]

[static337]

[Old n' slow]

[Eric&Barb]

Good job! Please update in a couple of weeks if still going well.
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In Stereo, Where Available!

[static337]

Got the manifold cleaned out it was clogged. Also changed the carb for a correctly rebuilt unit. Seems to be running good now. Holds an idle now. Just need to adjust the new carb and should be good. Fingers crossed. Thank you for all the help.

[flyboy161]

I think you are on the right track with the icing. Blocked preheat tube will wreak havoc on you until you find it.
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My father's 1970 Beetle-
http://www.thesamba.com/vw/forum/viewtopic.php?t=603879

The 1964...Diamond in the rough
http://www.thesamba.com/vw/forum/viewtopic.php?t=612776

My 1958 Morocco Bug-
http://www.thesamba.com/vw/forum/viewtopic.php?t=611483

[thekera]

I would check your float, to make sure it is not taking on fuel and sinking. Submerge the float in water and look for bubbles. Just an idea.

[Eric&Barb]

Well keep at it step by step. Sooner or later you will find the problem.
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In Stereo, Where Available!

[static337]

Update to my problems carb is icing up and cold to touch also heat risers are cold to touch. Gonna take those of and clean out the carbon. Also ordered a rebuilt German carb with good throttle shaft to hopefully clear up my problems. If those two don't fix it I'm stumped on this thing.

[static337]

Still no luck after carb cleaning and double checking everything else. I have spent countless hours checking and double checking everything I can think of and still no luck. I'm guessing it has to be a manifold leak at this point as I can't think of anything else.

[static337]

[static337]

[67rustavenger]

Ummm! Something like this was happening with my very reliable 1500. Yesterday I started the car and it ran under the choke. But when I moved the throttle at all it would immediately falter and die. I removed the dist cap to get access to the hold down nut on the case. Once I had the dist. in hand I noticed that my points wire inside the dist. was barely connected to the condenser I pushed the wire back on and reinstalled the dist. The engine fired right up and ran as it should.
It's worth a shot to check this out.
Good Luck.
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I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!

There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!

[Eric&Barb]

Got to expect to throughly clean the carb at least twice and possibly three times to get out all the gunk in it.

Back firing sounds like an intake vacuum leak. Those can be very insidious!
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In Stereo, Where Available!

[static337]

Sounds good. Thanks for the info. I think I'll pull the carb and go through it and clean everything again. I just double checked the timing and it's spot on. You can definitely tell it's a fuel related issue in my opinion. Just need to keep at it and figure out what's going on with it. Thanks again.

[flyboy161]

On my '64 I had a really intermittent lean issue. Sometimes shed run great and sometimes she would stall and backfire. Drove me crazy trying to dial it in. I eventually pulled the carburetor back apart. I removed every jet I could from inside and outside. I found what looked like Amber colored sand in the float owl. Just a few grains. That's from the ethanol in our gas, thanks Uncle Sam!

I also found a screw missing from the accelerator pump on the side of the carburetor so I dug out a screw from my stash and fixed that. After blowing out the path of fuel from under the accelerator pump gasket.

I blew every pathway for fuel out and as I reassembled I paid attention to the jets too. The main jet at the left side of the carb you can see down in the float bowl. I mad sure I could see the hole in the side of the jet through the hole in the bottom of the float bowl. I mean the complete hole, not "Oh, I can barely see it". My rationale was, if the the ethanol sand is in the bottom of the float bowl, where is it going to go? That's right, down into that hole that the jet screws into and then it could block that hole. Engine starves for gas but the float bowl is full.

The air correction jet is the really long one that sits inside between the float bowl and the Venturi.

I left the hook shaped nozzle in place because I could see a good spray of gas when I moved the throttle lever. In other words the accelerator pump works great. I also had one of those fall down into the intake while driving years ago. Had to disassemble the cylinder head to get it out...NOT COOL!

The idle jet is on the right side of the carb. Blow it out really well and blow through the opening in the carburetor that it screws into. When I put it all back together I took my time. I made sure the float worked properly. Then filled the carb with fresh gas and tested it. No leaks Gould stream of gas through the accelerator pump nozzle. Then reinstalled it on the car.

The idle air adjustment is 1.5-2 turns out from all the way in. Start the car and adjust idle speed to 800 rpm. Turn idle air in until idle speed starts to drop and then turn it back out no more than 1/2 turn.

In the technical section there is a book called "Look, Listen and Do It Better" all about the 28PICT carb. Read it. It is a really good manual.
_________________
My father's 1970 Beetle-
http://www.thesamba.com/vw/forum/viewtopic.php?t=603879

The 1964...Diamond in the rough
http://www.thesamba.com/vw/forum/viewtopic.php?t=612776

My 1958 Morocco Bug-
http://www.thesamba.com/vw/forum/viewtopic.php?t=611483

[static337]

Just cleaned the main jet and still dying after the choke releases. Also still backfiring. Would a lack of fuel cause this? I had a real bad back up of gunk in my fuel tank and wondering if my line from my tank is not kinked or if I still have some cleaning to do? Also timing is good it ran great before the carb rebuild and gas line issue.

[flyboy161]

If you're mixture is set, baseline is turned all the way in and then turn it out 1.5 to 2 full turns. Start the car, let it warm up at idle. Turn the mixture screw in slowly, until the idle speed just begins to drop, then turn the mixture screw out 1/2 turn.

What kind of distributor do you have. Mechanical advance? Is the vacuum port on the left side of the carburetor plugged? Vacuum advance distributor? Is the hose from carb to dizzy ok? No splits, cracks, not too loose?

Procure about 2 feet of vacuum hose (the really small stuff). Start the car and place one end of the just in your ear (not too far, just at the entrance) and hold the other end around the carburetor gasket, the mixture screw, the intake manifold connection at the head, etc. Follow that air circuit around, check everywhere. If you have a leaking gasket or vacuum hose leaking, the car will run too lean. At the throttle shaft, listen. You'll hear a definite hissing sound from a vacuum leak. It will stall as you let off the gas, i.e. approaching a stop sign.

I have an oddball intake that has a vacuum port over the #4 cylinder. It was plugged with hose and bolt and looked fine. However, the hose was cracked on the "front" side, where I could not see it. Another time my vacuum line from the carb to the dizzy was split. Just enough to cause stalling.
_________________
My father's 1970 Beetle-
http://www.thesamba.com/vw/forum/viewtopic.php?t=603879

The 1964...Diamond in the rough
http://www.thesamba.com/vw/forum/viewtopic.php?t=612776

My 1958 Morocco Bug-
http://www.thesamba.com/vw/forum/viewtopic.php?t=611483

[2T2-Crash]

Hows your timing?