Accelerator pump gas leak before and after rebuild. Rochester M4MC Quadrajet

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Did a complete rebuild of the carburetor. M4MC pre 1980 Rochester Quadrajet.
Parts changed out: check ball, needle, seat, plunger and garter spring on accelerator pump, all gaskets including choke ones and fuel filter one. plastic rod in the back of the choke housing.
I removed the old spacer under the seat before replacing with the new one. I hung the needle correctly as to how the instructions said and not through the holes. Set the float to 15/32" which it was already calibrated to.
350 5.7 litre

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20 окт 2024

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Комментарии : 9

@jessicabouchard4041 8 лет назад

plz let me know too. I rebuilt mine found out I didn't have enough pressure. I replaced fuel filter and fuel pump. now it's leaking out of excel orator pump and all over. I cleaned all the surfaces really good. I used 2 cans of carb cleaner and a tooth brush n rag.

@caos901 8 лет назад

Find out how much fuel pressure your new pump is putting out. In my case, the mechanical pump was pushing out more pressure than the carb could handle. This carb is made to only handle around 6lbs of fuel pressure. I had to install a fuel pressure regulator between the fuel pump and carb and adjusted it down to around 5lbs and it hasn't leaked since. If you have rebuilt yours and you have double and triple checked everything to make sure you haven't missed any old gaskets or hung the float incorrectly then i would suggest trying this.

@caos901 8 лет назад

from what others have told me and what i have gathered from the web, mechanical pumps don't ussually keep a stable fuel pressure and most recommend a pressure regulator inline with them. I'm not sure on this though but in my case it was true.

@caos901 8 лет назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lIdtpVsUAiU.html Here is it with the fuel regulator installed.

@stephenlong2522 8 лет назад

what did you do to fix it ?

@caos901 8 лет назад

+stephen long I ended up putting a fuel pressure regulator between the pump and the carb. I got a cheap one off of amazon and a guage. It solved the issue. I believe anything over 6lbs of pressure will make it leak from there but i'm not sure of that number. I believe 6lbs is the max for that carb. I hear the old pumps can pump at unreliable pressures and its best to put a regulator in anyways.

@stephenlong2522 8 лет назад

Ok because I just rebuilt my edelbrock 1406 and now my accelerator pump is leaking immediately after I turn the motor overb

@caos901 8 лет назад

stephen long Check to make sure you got all the old spacers out and all the old gasket out of there. Triple check to make sure everything was reassembled correctly. It kind of threw me off that mind started doing it after a rebuild too because it wasn't doing it before it and i did everything the way it was supposed to be done. I even thought the float was going too high and not stopping the reservoir from stopping due to an adjustment i must have made by accident but it wasn't. i think they are just really sensitive when it comes to fuel pressure.

@caos901 8 лет назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lIdtpVsUAiU.html Here is mine with the regulator installed. did u ever get it fixed?