Hi i'm new to the barn and need advise. Have '30 coupe and it just started to run crappy. I bought a bottle of "guaranteed to pass" to pour in the gas tank and it says it's used to clean valves and injectors. But, i'm afraid to pour it in. Should I not do it? What would clean the carb short of me taking it apart? I never had a problem until I followed some ones advice and took the air maze off. Thanks for any advice.
carb cleaner
- Thread starter pj the dj
- Start date
Brentwood Bob
Well-known member
Go thru some diagnostics. First, open the plug on the bottom of the carb,and see if you have a good flow of gas. If that is obstructed then unhook the gas line at the carb and see if you have good flow. I suspect dirt in the gas. Start there. Don't use the fixall, pour in the tank stuff.
Good time to learn how to clean the jets.
Bob
Good time to learn how to clean the jets.
Bob
ctvpa
Senior Member
There are several fuel filters in the Model A. One in the gas tank, one in the fuel line, and one in the carb. Be sure they are all clean.
Please don't put anything in the tank.
Many use marvel mystery oil in the gas (controversial as to if it does anything), but it will not correct this problem.
Also check your gas tank cover, loosen it. Sometimes the vent gets clogged. Also where is your GAV valve set (the valve in front of the passenger seat). It should be 1 full turn to start, then it should be adjusted to where the engine runs well. For some, they can run closed, Mine runs best about 1/4-1/2. Many will argue this, but as a long time Model A'er told me, If there is a adjustment, Henry meant it to be adjusted.
Good luck
Please don't put anything in the tank.
Many use marvel mystery oil in the gas (controversial as to if it does anything), but it will not correct this problem.
Also check your gas tank cover, loosen it. Sometimes the vent gets clogged. Also where is your GAV valve set (the valve in front of the passenger seat). It should be 1 full turn to start, then it should be adjusted to where the engine runs well. For some, they can run closed, Mine runs best about 1/4-1/2. Many will argue this, but as a long time Model A'er told me, If there is a adjustment, Henry meant it to be adjusted.
Good luck
FL&WVMIKE
Well-known member
Aok ......................
The corks were coated with shellac to keep the gasoline from getting to to cork. Alcohol is a solvent for shellac. The new (corn) gas has alcohol in it and disolves the shellac, allowing the cork to soak up the gasoline.
Those cork floats worked for decades, before the new gasoline came along.
MIKE
SeaSlugs
Well-known member
hmm
well lets see here: car was runnign good till you took off the air maze AKA a small air restriction. Since the engine cylinders cant adjust the amount of air they pull in and expell per stroke is going to stay the same.
an engine needs 3 parts to work: air, fuel, and spark. Since air and fuel both come from the carb, if you restrict one, the other has to give (or atempt to) the rest of the amount of air it sucks in per stroke.
Meaning in a nut shell:
With the air maze attached someone had to lean out the carb or it would suck too much gas causing it to run rich.
When you removed the maze the vacuum dropped so now it pulls less fuel so now your mix is too lean and not enough fuel so low on power, missing, coughing weird would be symptoms.
If you have ever messed with a pushmower and put your hand over the top of the open carb to restrict airflow it will flood the engine as its trying to suck air thru the fuel system (since it too is gravity fed just like an A)
Thats why if your push mower is hard to start and runs like crud check your air filter - usually their caked with dirt and oil and cant breathe.
A model A engine is nothing more than 4 lawnmower engines put together fed from one carb
so to answer your question: no carb cleaner will not help