Mechanical fuel pump, broken?

[fly4spd]

My fuel pump is just over a year old, it is a mechanical for a carb'd engine. the car is running really rich suddenly, and also idles higher. the carb was re-tuned over the summer, now i'm wondering if the fuel pump could be broken and giving too much pressure, if that is even possible, causing it to run really rich. if you guys have any idea let me know.
thanks,
-aj

 

[HISSIN50]

a mech FP is not the first place i would look. it is hard for them to fail and perform better than the originally did.

 

[fly4spd]

thats what i figured, what else could it be, would it have to be the carb or could it be something else?
i'm planning on getting a new carb anyway, so if it was the carb, it's not a big problem.

 

[rd]

If it is a Holley, make sure the power valve is not leaking fuel through the valve and, or vacuum through the diaphram, either problem will allow exta fuel full time.

Next item is check the float levels, see if one is sticking open.

Next, especially on vacuum secondary 4160 carbs, remove the rear bowl and tighten the six screws that hold the metering plate to the main body. If this fixes it, the rear bowl/metering plate gasket has become fuel saturated, and is leaking fuel into the secondarys. At some point, this will show up as a rich idle with black smoke.