Mercarb float, seat, needle adjustment

[bebecker]

I rebuilt my '89 3.0 Mercarb with the Sierra kit. I set the float height and drop for use with the spring needle following the mercarb service manual. I reinstalled carb and fuel pours into intake maifold while cranking. I am getting too much fuel.

My question is where to start trouble shooting now. Float is to factory specs from the mercarb service manual. Do I adjust float level, use the needle rod instead of the need spring, double check float weight, etc?

Any suggestions appreciated.

 

[Limited-Time]

Re: Mercarb float, seat, needle adjustment

I would pull the carb and check to make sure every thing looks as it should. Then check to see if the needle is seating and stopping the fuel flow. You can do this by blowing into the fuel inlet while holding the float up in the closed position. If you can force air past the needle and seat you'll have found your problem.

 

[John_S]

Re: Mercarb float, seat, needle adjustment

I had a flooding problem on my '97 5.7L MerCarb, and on the rebuild changed to the solid vs the spring in the original. The Seirra kit had both. All the Merc manual says is if you are having those issues, try a switch.