weber carb on a 1990 b2200

I just converted my stock carb over to a weber after hearing that they a good upgrade, with less reliability issues. I got the truck to start, but it wont stay idling, only when I feather the gas or hold the choke closed. Seems to me like I don't have enough fuel pressure. Any recommendations?

You check the Fuel Filter?

Automatic or 5 speed?

No I have not checked to fuel filter, its an auto. sprayed some carb cleaner around the carb and intake manifold. I got some leaks between the manifold and head. could be part of the problem. Do you know if I need to replace the fuel pump?

Most likely no need to do anything with a mechanical fuel pump (electrical one on automatics will need a regulator to lower the pressure).

You've got a vacuum leak with the adapters, common. Sand the adapters perfectly flat using wet/dry on a sheet of glass, use Permatex Aviation sealant (not RTV), and torque correctly, use blue Loctite.

I've had my Weber 9 years, rubs very smooth.

Mechanical pumps are usually mounted on the side of the motor correct? If so mine has an electric one.

Passenger side of cylinder head, back by the firewall. Yours may have a block-off plate there. Fuel filter close by. Automatics had electric pump in the fuel tank.

alright, ill pull the intake manifold off again and resand it and re-replace the gasket, and try again. I got a fuel pressure regulator on the way also. hopefully it works this time.

5 speed - fuel pump and filter in the engine bay...

Auto - fuel filter (at fuel tank) and pump in the fuel tank.

You must use a fuel pressure reg for an automatic, it produces too much pressure.

If you take apart your carb install be sure to sand the adapter plates flat and use "rubberized gasket paper" available at most parts stores.

It is leaking from the intake manifold gasket, I managed to get all the carb gaskets sealed well. I will pull that and clean it up better, use a higher end gasket and sealant. Ordered a fuel pressure regulator and gauge just so I can see the pressure. I still don't understand how it idles up if I cut of some of the air flow if it has to much fuel pressure, but I will give it a try and hope it works.

If you have an intake manifold leak and you cut off some air at the carb it certainly makes sense that it runs better - you are improving the air/fuel mixture. Before you cut down the air source it is running too lean... when you restrict the air the air/fuel mixture is being corrected/improved.

With an automatic, if you don't use a FPR you will blow the internal seals in the carb which would also mess up your air to fuel mixture.