☰
GET A QUOTE

Q: Replacing plug on Carburetor

asked by on February 23, 2017

I am removing the small brass plug that covers the fuel mix screw on a carburetor so that I can adjust the screw. Is there any reason that I need to replace the plug when I'm done or can I leave it open? If I need to replace it can you tell me what the purpose of that plug is?

Thanks, Brandon

Save Big on Auto Repairs Get a Quote

The plug is designed to prevent tampering although you should examine the plug to be sure it is not also intended to prevent the mixture screw from moving once the adjustment is made. If the plug is only "concealing" the adjustment screw, the sole purpose is to discourage adjustment once the mixture has been set. Sometimes exhaust gas analyzers are used to fine tune the carburetor and once everything is set obviously you want to reduce the possibility of tampering, hence the plug. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Carburetors
Repairs
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Truck stopped turning over one morning.
Hello you should have a mechanic inspect the 'no start' issue (https://www.yourmechanic.com/services/car-is-not-starting-inspection). The power to the starter needs to be checked. There are two wires going to the starter, a big wire which should have battery voltage at all times...
Read more
Lights not working
Hi. In some vehicles, all these lights are controlled by the dimmer switch. The switch may be part of your headlight switch, or it can just be attached to the headlamp switch. This is something that requires electrical wiring diagrams...
Read more
Engine is running rough and P0401, P0171 and P0174 codes.
The first thing to check is to see if the EGR solenoid will release the vacuum when the electrical connector is disconnected. If it still doesn't release the vacuum then the solenoid should be replaced. The codes need to be...
Read more
Loud noise at the front end
Without being able to hear the noise, it will be hard to make an accurate recommendation. If the noise is a rotational noise that changes intensity based on road speed then looking at tire wear patterns such as a cupping...
Read more
My emergency brake pedal is stuck in the up position.
Many common faults can cause your 2001 Chevrolet Tahoe's parking brake to get stuck in the "up" position. If the parking break will not apply, the brake cable could have failed, the parking brake lever could be faulty, or there...
Read more
Alternator belt hardly lasts more than two days. Meanwhile, when ever the belt is changed, it works well for two days again
Hi there - if the belt is failing within 2 days of driving, there is a problem with one of the components driven by the belt (alternator, AC compressor, water pump), the belt tensioner, or an idler pulley. If the...
Read more
if my radio is broken will i be able to still receive my gps signal?
Hello. Yes you should be able to still receive signal to your GPS even though the radio is not working. The radio and the GPS a Use two separate software systems but do however still operate hand in hand. Unless...
Read more
My manual car starts but will not move on any gears.
What you are describing sounds like potentially a worn out clutch. As you know, the clutch transmits engine power to the gearbox, and allows transmission to be interrupted while a gear is selected to move off from a stationary position,...
Read more
PS light on and engine will not start. While it is on, it's not the check engine but rather it's the power steering light.
Either the battery needs cleaned or replaced or the steering wheel lock solenoid has failed in the steering column. Look for any unusual problems with the power steering system (https://www.yourmechanic.com/services/warning-light-is-on-inspection) and if the battery has an corrosion on the terminals....
Read more

Related articles

What Causes an Exhaust Manifold to Crack or Leak?
Your car has two manifolds – an intake manifold and an exhaust manifold. Both serve essential purposes, but the one most likely to...
Read more
How to Fix Car Dents
Fixing car dents can be easier than you might think. You can use a plunger, dry ice, or a hairdryer to fix dents in your car body.
Read more
How Much Do Car Maintenance Costs Increase with Mileage?
The average car costs $1,400 to maintain up to 25,000 miles, then costs rise rapidly until 100,000 miles. Toyota wins as the cheapest car to maintain.
Read more

Browse other content

Estimates
Cities
Services
Maintenance