How to rebuild a Rochester Quadrajet 4MV carburetor
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m (→Accelerator pump assembly: minor clean up) |
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There are several different accelerator pump rod lengths used depending on the carb, if it's the wrong length this can cause the pump to work poorly. | There are several different accelerator pump rod lengths used depending on the carb, if it's the wrong length this can cause the pump to work poorly. | ||
| − | If the springs are reversed on the shaft, that can cause it to work poorly. If the piston seal is wrong it can have a hard time pushing fuel and/or allowing the pump to refill. | + | If the springs are reversed and the return spring that should be under the pump assembly is used as the override spring on the shaft, and the override spring is used under the assembly, that can cause it to work poorly. Sometimes the fuel filter spring gets mixed up with the accelerator pump springs as well. |
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| + | If the piston seal is wrong it can have a hard time pushing fuel and/or allowing the pump to refill. | ||
There's a ball that acts as a check valve under a screw in the float bowl, driver side. Be sure the ball is in place and sealing as it should. The check ball seat can be re-formed by carefully tapping an old check ball against the seat using a small punch and light mallet/hammer. | There's a ball that acts as a check valve under a screw in the float bowl, driver side. Be sure the ball is in place and sealing as it should. The check ball seat can be re-formed by carefully tapping an old check ball against the seat using a small punch and light mallet/hammer. | ||
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