I have a Ford BroncoII 88 2,9 V6, changed 2 fuel pumps but still have problems starting when motor is cold, looks like not enough gas is coming trough, I have to accelerate a little and then motor is running normal. I also changed fuel pump relay and checked wiring! What could be the problem ??

injectors are leaking like mad
so when did this old dog run perfectly>? last decade or?

Filter or pickup is probably clogged.

I would suspect that you have a failing fuel pump, the fuel pump pressure is bleeding off due to a faulty check valve, this causes hard starting esp when cold or after sitting. The fuel pump is located inside the fuel tank, the fuel tank must be removed to replace the fuel pump assembly.

pull the fuel line off the carb be careful have some one crank the motor quick other wise you will have fuel every ware now if the pump is working you shood see fuel shoot out of the line the motor will have to make atleast 1 full revalotion to check if nothing comes out thare you have it fuel pump let me no if you need any thing else bob

the only thing that comes to mind is, the fuel pump may be weak and not pumping enough fuel when cold. check fuel pump pressure. or replace pump.

did you try changing the fuel filter? it could be completely clogged

1) Running fuel pump to remove water from tank will likely not empty it all, but it might help. Will still be some liquid in bottom of tank.

2) More than likely, the gas has gummed up and is no good, While your draining of the tank will help, may still need to change the fuel filter and clean the injectors. The ability to keep engine running while pouring into the intake is a good sign, but mayfind that more parts need to be cleaned and replaced prior to solving the problem.

I had a similar problem only I was lucky enough that my gas gauge started working after it got lower than a 1/2 tank. It ended up being the float inside the tank. I ended up paying around $90 for the fuel float and it started reading the gas level correctly. But after 2 weeks and some severe cold weather, my engine wouldn't recieve any gas, ended up being the fuel pump. In buying the new fuel pump, along came a new float attached. So if your planning on replacing the float, go ahead and replace the whole pump, it will save you time, money, and hassle after its all over with.

Remove the gas cap when it does this. If you hear a woosh sound the tank vent isn't working properly. Essentially your tank has turned into a vacuum.

looks like you need a fuel pump. your current pump is dying.
and wont send enough pressure.