Does anyone know the easiest way to convert a car that was f/i to a carb.? Should i remove the in-tank fuel pump?

Well, to start off, i would just hang on to fi, because of the benefits it gives. but if for whatever reason you have your heart set on carburation, then this is what i would do.

get a new sending unit for the tank and run 1 single fuel line to an inline electric fuel pump close to the motor

remove ecm and install aftermarket guages, because if the ecm is left in it may present some crazy readings

install new intake and carb, and pray that the ecm doesnt control anything that would screw you up during this process.

this is the best i can suggest, aside from sticking with fuel injection. carbs have been headaches for me since i bought my first car with one, and i'm still kicking myself for not fixing my caprice when i was hit. but thats my $.02. hope this helps

I'd leave the FI on and if something's broken fix it. What engine is it anyway a 500? If it's a factory FI system you could swap a carb intake manifold and lose a lot of flow, you'd also probably need an inline electric pump and to remove the old pump or pumps.

Yes, the engine is a 500. I put the 500 in a 85' eldo. Is it a bad thing to have the in-tank fuel pump feed the carb? And believe me if i had the option to keep f/i I sure would. This mainly was a project I began to rid myself of the 4100 and in the process show my friends it could be done. The fuel system is all thats left to figure before i fire it up. I've spent about 1,500 so far but i did all the work i could. Bottom line is the budget is getting slim. All thats left is this fuel situation and exhaust work. Eventually i will go f/i but for right now i just need to see it crank!

The pressure needed by a FI system is much higher than a carb requires. A carb wants usually 4-5psi or so, most MPFI systems use something around 45psi. Some systems use 2 pumps, 1 to pull fuel from the tank and one to build pressure - if yours is one of these systems it MIGHT be possible to use the first pump alone so long as it doesn't supply too much pressure, check it with a gauge..

Does that mean it's possible to use the in-tank fuel pump that came with the car as long as the fuel pressure doesn't exceed 4-5 psi. Maybe add a pressure regulator to the line from the tank to allow the necessary pressure.

pressure regulator would do, my buddy uses the stock fuel pump with a regulator on his 89 carbed monte carlo

Your car had DFI. Thats generally around 10 psi. A regulator should suffice. BUT, how are you going to wire up the pump?