Hi All,
I have a 2100 on a 77 302 w/automatic trans and dual gas tanks. My version of the 2100 has the choke pull-down at the back of the air horn where the secondaries would be if it was a 4100. The carb has been starting and running great but I had a weird problem yesterday. I'm on vacation and tried to start the Bronco after three days of sitting, no action, so I pump the pedal once, no action, I pumped the pedal twice, no action. I used some starting fluid, slight action, more starting fluid and the Bronco starts, not happy w/lot's of black smoke and lot's of stuttering but after a few minutes purring away.The Bronco runs and starts without any problem since.
When I go back up front to put the air cleaner back on I see lot's of raw gas at the rear of the carb filling the pockets formed by the intake manifold (yes I wiped all that out before doing anything else, LOL). Before putting the air cleaner back on I push and pull every lever I can find several times but I can't make anything leak.
I brainstorm with a friend who is an old-fashioned gearhead and he suggests that since it has been over 100 degrees for the last few days that the pressure in the gas tank has somehow forced gas out of the carb and onto the manifold, and likely into it as well which would explain the hard start and black smoke. He suggests that I pop off the gas caps while the Bronco is sitting during the hot days and see what happens. I tried it and what happened is that there was no gas leaking from the carb and it started just as easily as it ever did.
So what should I be checking??? I have the charcoal filter box connected to the air cleaner, from the box there is a rubber hose that runs to a white plastic valve(?) on the frame, and then back to the main tank(?). Looking forward to hearing your thoughts as the idea of leaving the gas caps loose in really hot weather is not too appealing, LOL. BTW, this has never happened before in similar hot weather conditions.
Thank you for your thoughts, comments, and help!
I have a 2100 on a 77 302 w/automatic trans and dual gas tanks. My version of the 2100 has the choke pull-down at the back of the air horn where the secondaries would be if it was a 4100. The carb has been starting and running great but I had a weird problem yesterday. I'm on vacation and tried to start the Bronco after three days of sitting, no action, so I pump the pedal once, no action, I pumped the pedal twice, no action. I used some starting fluid, slight action, more starting fluid and the Bronco starts, not happy w/lot's of black smoke and lot's of stuttering but after a few minutes purring away.The Bronco runs and starts without any problem since.
When I go back up front to put the air cleaner back on I see lot's of raw gas at the rear of the carb filling the pockets formed by the intake manifold (yes I wiped all that out before doing anything else, LOL). Before putting the air cleaner back on I push and pull every lever I can find several times but I can't make anything leak.
I brainstorm with a friend who is an old-fashioned gearhead and he suggests that since it has been over 100 degrees for the last few days that the pressure in the gas tank has somehow forced gas out of the carb and onto the manifold, and likely into it as well which would explain the hard start and black smoke. He suggests that I pop off the gas caps while the Bronco is sitting during the hot days and see what happens. I tried it and what happened is that there was no gas leaking from the carb and it started just as easily as it ever did.
So what should I be checking??? I have the charcoal filter box connected to the air cleaner, from the box there is a rubber hose that runs to a white plastic valve(?) on the frame, and then back to the main tank(?). Looking forward to hearing your thoughts as the idea of leaving the gas caps loose in really hot weather is not too appealing, LOL. BTW, this has never happened before in similar hot weather conditions.
Thank you for your thoughts, comments, and help!
