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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Thu Sep 23, 2021 1:19 pm Post subject: Carb jetting no effect updated |
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68 sand rail 1600cc single port
I have a new 30/31 pict 3 carb I have changed the so called idle jet from 65 to 45 nothing. i have change the air correction jet from 120 to 125 no effect. it idles but dies once the spark plugs are covered in fuel. i have a air fuel gauge and it reads 10.5afr and only changes when the rpm is coming down. what am i missing?
update. I have fixed the high fuel pressure with a regulator but still dumbing fuel
Last edited by jammy217us on Fri Oct 01, 2021 11:42 am; edited 2 times in total |
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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Thu Sep 23, 2021 1:24 pm Post subject: Re: Carb jetting no effect |
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everything i have read says idle jet is to the right aux to the left
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L5wolvesf Samba Member
Joined: August 17, 2009 Posts: 196 Location: Northern AZ
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Posted: Thu Sep 23, 2021 5:45 pm Post subject: Re: Carb jetting no effect |
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What is your fuel pressure? _________________ Amonster Motorsports
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“Racing's important to men who do it well. When you're racing, it's life. Anything that happens before or after is just waiting.”
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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Fri Sep 24, 2021 1:23 am Post subject: Re: Carb jetting no effect |
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it has a stock fuel pump and im running rich. so i dont kno what the fuel pressure is. dont know if it will help. |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12743 Location: Western Canada
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Posted: Fri Sep 24, 2021 4:58 am Post subject: Re: Carb jetting no effect |
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I'm thinking high fuel pressure too. Or a leaking float valve. Or a very restrictive air cleaner. Or the choke is not coming off properly.
Float level is adjusted with thicker or thinner washers under the float valve assembly.
I am not entirely convinced that is the correct carb for a single port engine. It looks to me like a copy of the Solex 34 PCIT. I suspect the distributor is not the correct one either as there is no vacuum advance line being used but that is not your biggest problem. _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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Davz912/911 Samba Member
Joined: July 10, 2008 Posts: 27 Location: South San Francisco
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Posted: Fri Sep 24, 2021 2:23 pm Post subject: Re: Carb jetting no effect |
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While it's idling, look down the throat of the carb...If fuel is spewing out the float vent you have either a bad float (it sunk) a bad float seat, a mis-adjusted float, or as was the case with mine, to much fuel pressure. I ended up installing a fuel regulator. |
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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Sat Sep 25, 2021 5:01 pm Post subject: Re: Carb jetting no effect |
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i hope its the right carb amazon said it was a 30/31 Pict 3. it does have vacuum advance
you guy are right the fuel pressure is too high. i was thinking electric fuel pump, so as it dies the pump usually pump less. i did not understand that as the gasket wears out it will bring the pump closer to the rod.
i made a permanent setup for the gauge for now till i adjust the pump thank you guys. |
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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Sat Sep 25, 2021 5:10 pm Post subject: Re: Carb jetting no effect |
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Can i just put a regulator on it or do i need to shim the fuel pump? |
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dirtkeeper Samba Member
Joined: February 19, 2008 Posts: 3200 Location: Left of everywhere
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Posted: Sun Sep 26, 2021 8:51 am Post subject: Re: Carb jetting no effect |
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jammy217us wrote: |
Can i just put a regulator on it or do i need to shim the fuel pump? |
If you can fix it without adding another part to the system would be best , I have had multiple different carb set ups over the years and have never used a regulator. |
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dustymojave Samba Member
Joined: January 07, 2007 Posts: 5802 Location: Lake LA, Mojave Desert, SoCal
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Posted: Mon Sep 27, 2021 1:11 am Post subject: Re: Carb jetting no effect |
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Some of the stock replacement pumps on the market these days have inappropriate pressure output for a stock VW carb, and are even worse for most aftermarket carbs. I'm not sure what is meant by
" i was thinking electric fuel pump, so as it dies the pump usually pump less. i did not understand that as the gasket wears out it will bring the pump closer to the rod."
But...The about 5.3psi you can see in his gauge is too much. So adding a fuel pressure regulator is a good solution here. Sure, he can play with more gaskets under the pump to change the effective pump rod length and theoretically alter the pump output. But I would refer a regulator adjusted to the appropriate pressure. _________________ Richard
Offroading VW based cars since 1965
Tech Inspection 1963 - 2012 SCCA/SCORE/HDRA/MORE/MDR +
Retired from building Bajas, Fiberglass Buggies and Rails in the Mojave Desert. Also Sprints & Midgets, Dry Lakes, Road Race cars. All types New and Vintage
SoCalBajas Member
Kicked Cancer's A$$...1st and 2nd round...Fight ain't over yet. |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12743 Location: Western Canada
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Posted: Mon Sep 27, 2021 3:43 am Post subject: Re: Carb jetting no effect |
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Extra gaskets adjust the volume. A regulator adjusts the pressure. You choose. _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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jammy217us Samba Member
Joined: September 23, 2021 Posts: 15 Location: nebraska
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Posted: Fri Oct 01, 2021 11:38 am Post subject: Re: Carb jetting no effect |
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i got the fuel pressure down to 2 psi and still have no change in afr
the sad part is i got a cheap amazon regulator and 2 psi is the best i could do
im running a 50 idle jet and just nothing does anybody have any good info on the 30/31 float or any other reason i just cant get this thing to stop dumping fuel. |
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Mike Fisher Samba Member
Joined: January 30, 2006 Posts: 17970 Location: Eugene, OR
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Posted: Fri Oct 01, 2021 12:18 pm Post subject: Re: Carb jetting no effect updated |
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www.aircooled.net sells parts/has Technical Articles on carburetors & gives free advice! _________________ https://imgur.com/user/FisherSquareback/posts
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