How do you know if your diaphragm carburetor is bad?
The symptoms of a bad diaphragm are similar to other mower problems. Refusal to start or cutting out during running may be the first sign of a problem. The mower may smoke excessively or sound sluggish. At high speeds, the motor is more likely to give out or seem like it is starving or flooding.
What does a diaphragm do on a carburetor?
The diaphragm is connected to the needle valve and as it moves inward it opens the needle valve to admit more fuel, thus replenishing the fuel as it is consumed. As fuel is replenished the diaphragm moves out due to fuel pressure and a small spring, closing the needle valve.
How do you test a diaphragm fuel pump?
Checking the pump operation
- Seal the outlet pipe(s) with a finger, and push the lever up; it should move freely and the diaphragm should stay still if the inlet valve is seating.
- Seal the inlet pipe and push the lever again; you should feel resistance, but the diaphragm should not move if the outlet valve is seating.
How do I identify a Zama carburetor?
Identify the Zama carburetor type. The carburetor body number identifies the carburetor type. The major types of Zama carburetors include the C1M, C1Q, C1T, C1U, C3, C3A and the C3M. One of these designations will be stamped on the carburetor, thus identifying the carburetor type.
How does diaphragm fuel pump work?
Diaphragm pumps use a composite membrane, which flexes up-down over a fuel bowl. The bowl has an input and an output, each with a check valve in place to ensure a one-way motion of fluid. As the diaphragm moves up, it creates a vacuum, pulling fuel from fuel tank into the fuel bowl.
How does a Zama carburetor fuel pump work?
Zama Carburetor Technical Guide. The fuel pump on a diaphragm carburetor uses the vacuum and pressure pulse from the engines crankcase to move a diaphragm up and down. The pulse travels from the crankcase through a drilled passage or a hose to the carburetor. As the diaphragm moves up it expands the area in the pump chamber.
How does the fuel pump work on a diaphragm carburetor?
The fuel pump on a diaphragm carburetor uses the vacuum and pressure pulse from the engines crankcase to move a diaphragm up and down. The pulse travels from the crankcase through a drilled passage or a hose to the carburetor.
How does the metering diaphragm work on a carburetor?
The metering diaphragm is made of a flexible convoluted material to allow for greater movement. As the engine runs, fuel is being drawn from the metering chamber in the carburetor. This causes the metering diaphragm to move up and contact the metering lever.
What to do if you suspect a carburetor problem?
If you have an engine performance problem and suspect the carburetor the first thing that must be done is to confirm that you actually have a carburetor problem. Above is a trouble-shooting guide that can help you diagnose engine problems that can often be mistaken for the carburetor.