Solex 30 PICT-1 Carb Hesitation

[67 Florida Deluxe]

For years my '67 bug has run superbly. That record came to an end a couple weeks ago when the engine chugged suddenly, recovered, and then slowly died as if it simply ran out of gas. I made it off the main road and attempted a restart. It would start then immediately die. Trying to feather the pedal upon subsequent restarts was futile. I mashed the pedal to the floor and restarted. It roared to life and that seemed to clear whatever obstruction was at issue and I drove home event-free.

But the following day, it was clear there was still a carb issue. I removed it, cleaned it, reassembled and reinstalled. It ran okay but completely died upon tapping the accelerator. R and R again with 2nd cleaning. Reinstalled and it idles fine, accelerates great, but only as long as it's gradual. If you tap the pedal at any point during idle or holding a rev, it balks but doesn't die. It recovers and revs up.

The accelerator jet, which I believe is the hooked one "A" shoots a nice solid stream of fuel straight down the carb throat when the throttle lever is pulled. I'm stumped as to why it hesitates and balks when I tap the pedal. It still idles perfectly and will run up very smoothly as long as I don't goose the pedal. Any ideas?

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-Kent (BaT "daleallen")

OG member of the '67 Posse

A few of my toys, past and present
'56 Oval, '66 KG Conv't, '67 21-Window, '67 Bug, '79 SuperVert, '55 Pre-A Continental

[67_13Deluxe]

When you pulled it apart how did the accelerator pump diaphragm look? I had a similar problem and the diaphragm was no good. Replaced and all was well.
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If you can't dazzle them with your brilliance, baffle them with your bullsh*t.

56 Beetle - Wilbur. I found a lot of lipstick on this pig so far.
63 Beetle - Luna
66 13 window Bus - Tetanus
71 Bay Window - Lola. Totaled.

[TheRide]

is your timing advance working?

[66brm]

[67 Florida Deluxe]

[67 Florida Deluxe]

[67 Florida Deluxe]

There was definitely a few bits of fine debris in the carb bowl when I took it apart the first time. And the accelerator jet was shooting against the side of the carb throat with an inconsistent stream. Now that that issue has been cleared up, yet there's still a small degree of hesitation, I will look into the distributor advance. Looking at both Bentley and Idiots, but any suggestions for checking the advance function is appreciated. It's the stock dizzy.
_________________
-Kent (BaT "daleallen")

OG member of the '67 Posse

A few of my toys, past and present
'56 Oval, '66 KG Conv't, '67 21-Window, '67 Bug, '79 SuperVert, '55 Pre-A Continental

[67rustavenger]

[67 Florida Deluxe]

[KTPhil]

[Eric&Barb]

Did you remove and clean out that nozzle by spraying carb cleaner in the reverse direction? Those can still spray, but be partly clogged enough to cause a problem.
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In Stereo, Where Available!

[67 Florida Deluxe]

[Airstream65]

I have an issue with my 30 PICT-1 dripping fuel after engine is shut off. Fuel drips slowly out of the squirter tube! I've been trying to solve this issue for a month!

[Eric&Barb]

[KTPhil]

[Airstream65]

Not vent tube, the sqirter itself, after driving. I can hear the little check ball rattle when I take carb apart, but it still has a slow drip for a while after shutdown. Fuel pump pressure is 1.5-2lbs.

[Eric&Barb]

[Airstream65]

Can I slightly bend float?

[Eric&Barb]

[67 Florida Deluxe]

As relates to the original post, here's my outcome: SUCCESS!!

The hesitation and bogging issue was two-fold; a clogged accelerator jet AND clogged vacuum advance tube. Sorry for the dissertation, but it may help summarize for someone else with the same issue.

When I originally removed the carb I noted a little bit of fine particulate in the bottom of the bowl. Operating the throttle lever, I noted the stream from the accelerator jet ("A" in my original post photo) was bubbly and also would hit the side of the carb throat if you moved the lever quickly. Lots of carb cleaner spray and compressed air from the duster cans and it finally squirted properly. (Note, I did not remove the jet, all was done through the hole in the accelerator pump.) I also shot carb cleaner (using the straw) through every other orifice and followed up with compressed air.

Reinstalled carb and still had hesitation issue but not nearly as bad; the engine didn't die. I tested the operation of the distributor advance diaphragm by attaching a new hose to the long metal vacuum tube that connects to the diaphragm and gently applied suction. I watched to see if the plate in the distributor moved (cap removed). It operated perfectly with the slightest of suction. Connected vacuum hose to vacuum tube in carb and blew. I felt a tiny something "give" which must have been the obstruction.

Followed KTPhil's suggestion from above related to the accelerator pump diaphragm, reinstalled the carb and cranked it intermittently until the bowl filled and the engine tried to fire. Tapped the pedal to ensure the choke was set and hit the key again. It fired right up and idled perfectly (as it did before). This time, it never faltered. Took the 'ol beater for a spin and kept going, it ran so well! When I returned, there was none of the distinct exhaust smell of a misfiring engine, which was caused by the vacuum advance not operating properly due to the obstruction that was in the vacuum tube.

So, properly operating accelerator jet and properly operating vacuum advance = resolved hesitation, balking and hindered power issue in this case. (And adding an inline fuel filter NOT above the distributor to ensure only clean fuel enters the carburetor bowl.)
_________________
-Kent (BaT "daleallen")

OG member of the '67 Posse

A few of my toys, past and present
'56 Oval, '66 KG Conv't, '67 21-Window, '67 Bug, '79 SuperVert, '55 Pre-A Continental