1978 Bronco has been stalling out

[RangerxxRick]

I have just bought a 1978 Bronco full size with the 400M. In the beginning it was overheating and stalling, I took it to Meineke for repairs. I have replaced the following parts.. The water pump, Thermostat, fan clutch, fan shroud. The overheating was fixed but it kept stalling so I contacted Meineke again and they said it could be the ignition module or the ignition switch. The bronco has a low elevation module on it and that is hat I replaced it with as well as the ignition switch. The Bronco is still stalling out after about 20 minutes of run time..does anyone have any suggestions. Thanks

 

[Justshootme84]

Could be as simple as replacing the fuel filter, or a problem with the carb. Check the line at the carb when you replace the filter/have it replaced. Look for signs of rust or debris from the gas tank.

 

[RangerxxRick]

Could be as simple as replacing the fuel filter, or a problem with the carb. Check the line at the carb when you replace the filter/have it replaced. Look for signs of rust or debris from the gas tank.

Hello, I have just replaced the fuel pump and filter and it seems to be running ok for now. Do you think I should put an inline electric fuel pump on the Bronco just in case ?

 

[Justshootme84]

I don't think it's absolutely necessary, but that's up to you. You may be having a problem with "vapor lock", or the carb needs work. Take a look at the fuellines from the tank to the carb, looking for any holes or collapsed spots. You can also check to be sure the choke and throttle linkage on the carb are not rusted or binding up. On my 78 Bronco, I noticed the throttle spring was a 'Mickey Mouse' fab job, and replaced it with the correct spring. that solved alot of the problem i had with the idle and the linkage sticking.

 

[Seabronc]

Hello, I have just replaced the fuel pump and filter and it seems to be running ok for now. Do you think I should put an inline electric fuel pump on the Bronco just in case ?

Use one or the other but not both. Also check the tank vent, If it is not working, the tank will start to collapse which can cause fuel starvation after running for a while. If you hear a hissing when you take the cap off, your tank vent is not working properly. It has two functions: 1. to relieve the pressure when the tank heats up 2. allow air into the tank to make up fro fuel being taken our by the engine.

Good luck,

>-

 

[RangerxxRick]

Use one or the other but not both. Also check the tank vent, If it is not working, the tank will start to collapse which can cause fuel starvation after running for a while. If you hear a hissing when you take the cap off, your tank vent is not working properly. It has two functions: 1. to relieve the pressure when the tank heats up 2. allow air into the tank to make up fro fuel being taken our by the engine.Good luck,

>-

Thanks everyone, I have checked all of the above and everything seems to be in order. I am going to try an electric fuel pump from the junk yard just to see if that solves the problem..well that and a vented gas cap. I will let everyone know what the outcome is. Again thanks for your messages and time. Sincerely, SMR.